XLV International Symposium on Multiparticle Dynamics

4 Oct 2015, 07:30 → 9 Oct 2015, 18:00 Europe/Berlin

S. Bethke (Max Planck Institute für Physik), Stefan Kluth (MPI für Physik)

ISMD 2015

Photo: Hanns-Seidel-Stiftung

The International Symposia on Multiparticle Dynamics (ISMD) are a series of major international high-energy physics conferences for theorists and experimentalists from three different but related communities (high energy, heavy ion and astroparticle physics), with a common interest in reactions involving a large number of particles in the final state.

The XLV International Symposium on Multiparticle Dynamics ISMD 2015 will be held in Wildbad Kreuth (Germany) and is organized by MPP. It will consist of experimental and theoretical plenary talks spread over 5 days. The goal is to provide a pleasant and stimulating environment for presentation and discussion of recent experimental results as well as new developments in theory. Attendance is limited to about 100 participants.

Bulletin 1 bulletin1.pdf

Conference Poster ismd_poster.pdf

Credit Card Payment Form ismd15_credit_card.pdf

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Sunday, 4 October

14:00 → 19:00 Arrival

17:30 → 20:00 Dinner

Monday, 5 October

07:30 → 09:00 Breakfast

08:00 → 09:00 Registration

Conference secretariat
Seminarraum 4

09:00 → 09:15 Welcome

slides welcome.pdf

09:10 → 12:32 Multiparticle Correlations and Fluctuations: All talks are scheduled expecting 2 minutes for discussion.

Conveners: Dr Andy Buckley (University of Glasgow), Dr Edward Sarkisyan-Grinbaum (University of Texas at Arlington and CERN)

09:15 Results on minimum bias interactions, underlying event and particle production, and Bose-Einstein correlations from ATLAS

Measurements of the properties of charged particle production are presented from proton-proton collisions at different centre-of-mass energies in the range of 0.9 to 13 TeV and compared to various Monte Carlo event generator models. Furthermore particle distributions sensitive to the underlying event in proton-proton collisions have been measured and are compared to theoretical models. The production properties of mesons and baryons are presented and compared to predictions. The effects of space-time geometry in the hadronization phase has been studied in the context of Bose-Einstein correlations between charged particles, for determining the size and shape of the source from which particles are emitted and for interpreting of quark confinement effects. Bose-Einstein correlation parameters are investigated in p-p collisions at 900 GeV and 7 TeV, up to very high charged-particle multiplicities.

Speaker: Yuri KOULTCHITSKI (Head of Sector)

Paper Kulchitsky_ISMD2015_280116.pdf

Slides Kulchitsky_ISMD15_021015.pdf

09:32 Underlying event and correlation results from CMS

The underlying event activity in pp collisions, measured using events with a leading charged particle or a leading charged particle jet, lends credence to multiparton interactions. The activity is measured independently in the two halves of the region transverse to the leading object, containing the maximum and minimum activities. Complementary to the underlying event analysis, the observation of long-range two-particle correlations in high energy heavy ion collisions opens opportunities to explore novel QCD dynamics in quark gluon plasma (QGP), the hot dense matter created in heavy ion collisions. We present selected results of the underlying event activity and particle correlations in various collision systems.

Speaker: Mr Wei Yang Wang (National University of Singapore (NUS))

Paper UE&Corr_ISMD2015.pdf

Slides PresentationISMD_051015.pdf

09:49 Event-by-event fluctuation and correlation measurements at the LHC energies in ALICE

Event-by-event fluctuations in relativistic heavy-ion collisions may reveal important information about the QCD phase transition and can be used for characterizing the hot and dense system formed in heavy-ion collisions. Fluctuations of many observables are associated with thermodynamic quantities of the strongly interacting system. The event-by-event fluctuations of the mean transverse momentum, temperature, multiplicity and net-charges are related to the fundamental properties of the system. In this presentation, we will discuss the recent results from ALICE experiment on event-by-event fluctuations and particle correlations at LHC energies for Pb-Pb, p-Pb and pp collisions. Along with that the results of balance functions analysis at LHC energy will be shown. We will also make comparisons to the measurements at lower beam energies from different experiments and discuss the prospect for these studies at LHC energies.

Speaker: Mr Sumit BASU (on behalf of the ALICE collaboration)

Slides ISMD_2015_Sumit_v3.pdf

10:06 The Study of Two Anti-proton Interaction via Correlation Measurement at STAR

The two-particle correlation at small relative momenta is influenced by the nuclear force between two particles, which has been intensively studied for nucleons or nuclei but not much for anti-nucleons or anti-nuclei. In this talk, we present the (anti)proton-(anti)proton correlation function in Au+Au collisions at \sqrt{s_{NN}} = 200 GeV based on data taken by the STAR experiment at RHIC. We show the attractive nuclear force between two anti-protons, and present the measurement of the two key parameters that characterize the corresponding strong interaction, namely, the scattering length and the effective range. Our measurement serves as a useful verification of CPT symmetry. Of equal importance as a direct knowledge of the interaction among two anti-protons, the simplest system of antinucleons(nuclei), our result provides a fundamental ingredient towards understanding the structure of more sophisticated anti-nuclei and their properties.

Speaker: Mr ZHENGQIAO ZHANG (BNL)

Slides 2015ISMD_Zhengqiao.pdf

10:22 Searching for hidden sectors in multiparticle production at the LHC

Most signatures of new physics beyond the Standard Model have been studied on the transverse plane with respect to the beam direction. In this work we rather consider the effect of a hidden sector (i.e. Hidden Valley model) on rapidity correlations, moments and cumulants of multiplicity distributions in multiparticle production with an special emphasis in the prospects for the forthcoming LHC results.

Speaker: Prof. Miguel-Angel Sanchis-Lozano (IFIC, University of Valencia)

Paper sanchis_2.pdf

Slides ISMD_Sanchis.pdf

10:38 Coffee break

11:08 The tau-model of Bose-Einstein correlations -- recent results

Some new results concerning the tau-model of Bose-Einstein correlations will be presented.

Speaker: Dr Wesley Metzger (Radboud University)

Paper proc.pdf

Slides talk.pdf

11:24 Finite size of hadrons and Bose-Einstein correlations in pp collisions at 7 TeV

I shall report the recently published paper [PLB748(2015)9], written together with Wojtek Florkowski and Kacper Zalewski. Starting from the observation that the composite nature of hadrons implies space-time correlations between produced particles, we studied consequences of this effect for the Bose-Einstein correlation function of identical particles. The expected magnitude of these effects is evaluated using the recently performed blast-wave model analysis of the data for pp collisions at √s = 7 TeV.

Speaker: andrzej bialas (Jagellonian University, Krakow)

Paper andrzej_bialas_ismd2015_proc-2.pdf

Slides Krz15one.pdf

11:40 Quantum properties of QCD string fragmentation

A simple quantization concept for a 3-dim QCD string is used to derive properties of QCD flux tube from the mass spectrum of light mesons and to predict observable quantum effects in correlations between adjacent hadrons. The quantized fragmentation model is presented and compared with experimental observations.

Speaker: Dr Sharka Todorova-Nova (Charles University, Prague)

Paper todorova_ISMD2015.pdf

Slides ismd2015.pdf

11:56 Bayesian model comparison for one-dimensional azimuthal correlations

In the context of data modeling and comparisons between different fit models, Bayesian analysis calls that model best which has the largest evidence, the prior-weighted integral of the likelihood function over model parameters. Evidence calculations automatically take into account both the usual chi-squared measure and an Occam factor which quantifies the price for adding extra parameters. Applying Bayesian analysis to 1D projections onto azimuth of 2D angular correlations from 200 GeV AuAu collisions, we consider typical model choices including Fourier series and a Gaussian plus combinations of individual cosine components. A power-spectrum analysis is also performed. We find that models including a Gaussian component are consistently preferred over pure Fourier-series parametrizations, sometimes strongly so. For models including a Gaussian an additional cylindrical quadrupole is required in some cases but rejected for 0-5%-central collisions. Higher harmonics are always rejected.

Speaker: Hans Eggers (Stellenbosch University)

Paper eggers-dekock-trainor-ismd2015-proceedings.pdf

Slides eggers-ismd15.pdf

12:12 Universality of particle production and energy balance in hadronic and nuclear collisions

Universality of multihadron production in AA and hadronic interactions is studied using collision energy and centrality dependencies of the measured charged particle mean multiplicity. The study uses the framework of an effective-energy approach combining the constituent quark picture and Landau relativistic hydrodynamics and relating hadronic and nuclear collisions. The energy dependence of the multiplicity and the pseudorapidity density of head-on AA collisions are well reproduced. The multiplicity centrality dependence reveals a new scaling between the measured and estimated pseudorapidity spectra. Using this scaling, called the energy balanced limiting fragmentation scaling, all centrality spectra are described. This elucidates the difference in centrality dependence of multiplicity at RHIC and LHC and also the RHIC midrapidity density vs multiplicity. A new regime in AA collisions is indicated at ~1 TeV. Predictions are made for the multiplicities in pp and AA collisions at LHC.

Speakers: Mr Aditya Nath Mishra (IIT INdore), Dr Raghunath Sahoo (IIT Indore, India)

Paper ismd2015.pdf

Slides Aditya_ISMD2015.pdf

12:30 → 14:00 Lunch break

14:00 → 17:45 Diffraction and Pomeron

Conveners: Dr Marek Tasevsky (Institute of Physics of AS CR), Dr Roman Pasechnik (Lund University)

14:00 Measurement of diffractive and exclusive processes with the ATLAS detector

The ATLAS collaboration has carried out a study diffractive dijet production at 7 TeV pp collisions at the LHC, i.e. events with a hadronic system containing at least two jets in addition to a large region of pseudorapidity devoid of hadronic activity. The data distributions are compared with Monte Carlo models and the rapidity gap survival probability has been estimated in the kinematic region with high diffractive contribution. Prospects for exclusive jet production studies with the forward proton tagging capability of the AFP sub-detector of ATLAS will be discussed. A first look at data taken jointly with the ATLAS and LHCf detectors in a p+Pb run will also be shown. In addition the measurement of the exclusive gamma+gamma -> ll production cross-section in proton-proton collisions at a centre-of-mass energy of 7 TeV has been carried out.

Speaker: Grzegorz Gach (AGH University of Science and Technology)

Paper ATLASdiffraction.pdf

Slides ATLASDiffraction.pdf

14:20 Hard diffraction in Pythia8

We present a new model for hard diffraction in Pythia8. The model uses the Pomeron approach pioneered by Ingelman and Schlein, factorising the diffractive cross section into a Pomeron flux and a Pomeron PDF, with several choices for both implemented in Pythia8. The main feature of the model is that it allows for any Pythia8 hard process to be generated diffractively, and includes an option of restricting the number of MPIs in the diffractive system to ensure survival of the rapidity gap. The new model has been used in a Monte Carlo study on diffractive dijet production from which preliminary results will be shown.

Speaker: Ms Christine Rasmussen (Lund University)

Paper ismd_christine.pdf

Slides ismd_christine.pdf

14:35 Recent CMS results regarding forward physics and diffraction

Recent CMS results regarding forward physics and diffraction are reviewed. The differential diffractive cross section is measured as a function of xi= M_X^2/s in the region dominated by single dissociation (SD) and double dissociation (DD), where M_X is the mass of one of the two final-state hadronic systems separated by the largest rapidity gap in the event. The cross section is also measured as a function of the width of the central rapidity gap in the region dominated by DD, as well as for events with a forward gap over 8.4 units of pseudorapidity. The total SD and DD cross sections are extracted. The observation of a hard color-singlet exchange process in events with a large rapidity gap between two leading jets (jet-gap-jet) is reported. The fraction of jet-gap-jet to all dijet events is measured as a function of the second leading jet transverse momentum and the size of the pseudorapidity gap. The measured fractions are compared with predictions as well as Tevatron data. Furthermore, also the observation of exclusive Y production in pPb collisions at 5.02TeV per nucleon is reported.

Speaker: Dr Gabor Veres (CERN)

Paper ISMD2015Veres.pdf

Slides ISMD15_vg.pdf

14:55 Evidence for Non-Exponential Elastic Proton-Proton Differential Cross-Section at Low |t| and sqrt(s) = 8 TeV by TOTEM

The TOTEM experiment has made a precise measurement of the elastic proton-proton differential cross-section at the centre-of-mass energy sqrt(s) = 8 TeV based on a high-statistics data sample obtained with the beta* = 90 optics. Both the statistical and systematic uncertainties remain below 1%, except for the t-independent contribution from the overall normalisation. This unprecedented precision allows to exclude a purely exponential differential cross-section in the range of four-momentum transfer squared 0.027 < |t| < 0.2 GeV^2 with a significance greater than 7 sigma. Two extended parametrisations, with quadratic and cubic polynomials in the exponent, are shown to be well compatible with the data. In this invited talk, presented for the TOTEM Collaboration, I will also overview the present status, the recent preliminary results and the upgrade plans of the TOTEM experiment at CERN LHC.

Speaker: Prof. Tamas Csorgo (Wigner RCP Budapest and KRF Gyongyos)

Paper CsI-v8.pdf

Slides 2015-10-04-Csorgo-4-TOTEM-ISMD-2015-presented.pdf 2015-10-04-Csorgo-4-TOTEM-ISMD-2015-presented.pptx

15:15 A model for soft interactions based on the CGC/saturation approach

I discuss a model based on Coloured-Glass-Condensate/saturation and the BFKL Pomeron. I show that this model successfully describes the elastic, diffractive and inclusive data at LHC energies. The talk is based on material appearing in arXiv:1408.3811, arXiv:a502.05202 and arXiv: 1503.04294

Speaker: Prof. Errol (Asher) Gotsman (Tel Aviv University)

Proceedings ISMDgots.pdf

Slides gotswb.pdf

15:30 Diffractive phenomenology and Pomeron physics at the LHC era

It is shown that “soft” proton-proton collisions at the LHC, from 2 TeV and beyond are dominated by Pomeron exchange. This is quantified e.g. by fitting the elastic scattering cross-section to the available (7 and 8 TeV) data, where the contribution from secondary Reggeons is shown to be smaller than the relevant experimental errors. A tiny Odderon contribution is also scrutinized and its parameters are defined. Due to Pomeron dominance, Regge factorization can be effectively used to relate e.g. double diffraction dissociation (DD) to single proton dissociation (SD) and elastic scattering. Predictions for SD and DD cross sections and their ratios for the RUN-2 LHC measurements are obtained. A dipole Pomeron model of diffractions dissociation compatible with unitarity is constructed and a dip in the t dependence of SD cross section around -1 GeV is predicted.

Speaker: Prof. Laszlo Jenkovszky (Bogolyubov ITP, Kiev)

Proceedings Submit_Dec9.pdf

Slides Jenkovszky_ISMD_2015.pdf

15:45 Coffee break

16:15 Recent progress in exclusive and semi-exclusive processes in proton-proton collisions

I will review recent progress in exclusive production of mesons and dileptons in proton-proton collisions. This includes exclusive production of J/psi, psi' and rho^0 mesons as well as production of two pions, two leptons, two photons or two charged Higgs bosons. In the case of the charmonia a k_t-factorization method with unintegrated gluon distributions is applied. A possible sign of the onset of saturation will be given. The charmonium wave function effects will be discussed. In the case of rho^0 and pi^+ pi^- production we apply a model of tensor pomeron, a new concept being actively developed and tested in recent 2 years, to the production of continuum and resonances. A discussion of processes with electromagnetic dissociation (large rapidity gap) will be discussed as an example for dilepton production. Exclusive production of two charged Higgs boson will be discussed in the context of searches for these exotic objects at the LHC and FCC.

Speaker: Prof. Antoni Szczurek (Institute of Nuclear Physics and Rzeszow University)

Paper szczurek_proc_short.pdf

Slides szczurek_ismd2015.pdf

16:30 Central Exclusive Production in Proton-Proton Collisions with the STAR Experiment at RHIC

We shall describe the physics program with tagged forward protons, focusing on Central Exclusive Production (CEP) in polarized proton-proton collisions at the Relativistic Heavy Ion Collider (RHIC), with the STAR detector at \sqrt{s} = 200 GeV. Preliminary results in CEP of two oppositely charged pions and kaons produced in the processes $pp\to pp \pi^+\pi^-$ and $pp\to pp \K+\K^-$ shall be presented. Those Double Pomeron Exchange (DPE) processes, allow the final states to be dominated by gluonic exchanges. Silicon strip detectors placed in Roman Pots were used for measuring forward protons. The preliminary results are based on the measurement of the recoil system of charged particles in the STAR experiment's Time Projection Chamber (TPC). Ionization energy loss, dE/dx, of charged particles was used for particle identification (PID). In addition to those preliminary results, the present status and future plans of the diffractive physics at RHIC shall be described.

Speaker: Dr Wlodek Guryn (Brookhaven National Laboratory)

Paper GurynISMD2015Submitt.pdf

Slides GurynISMD-XLV.pdf

16:50 Exclusive Central $\pi^{+}\pi^{-}$ Production in Proton Antiproton Collisions at the CDF

Exclusive central hadronic systems from hadron collisions result primarily from double pomeron exchange, and these have very restrictive quantum numbers: $I^{G}J^{PC}$ = $0^+ (\text{even})^{++}$. This "quantum number filter" is a powerful tool for meson spectroscopy in the isoscalar sector, especially for glue-rich states. In addition it provides information on the nature of the pomeron. We have measured exclusive $\pi^{+}\pi^{-}$ production in proton-antiproton collisions at $\sqrt{s} = 0.9$ and 1.96 TeV in the Collider Detector at Fermilab. We selected events with exactly two oppositely charged particles, assumed to be pions, in $|\eta|<1.3$ with no other particles detected in $|\eta| < 5.9$. The central $\pi^{+}\pi^{-}$ was required to have rapidity $|y|<1$. By requiring no other charged particles, these events are dominated by double pomeron exchange. The data is valuable for understanding the pomeron in a region of transition between non-perturbative and perturbative QCD.

Speaker: Ms Maria Zurek (FZ Jülich)

Proceedings MariaZurekSMD2015.pdf

Slides MariaZurek.pdf

17:10 Recent diffractive results from HERA

The exclusive dijet production in diffractive deep inelastic e+- p scattering has been measured with the ZEUS detector at HERA using an integrated luminosity of 372 pb^{-1}. The measurement was performed for \gamma^*-p centre-of-mass energies in the range 90 < W < 250 GeV and photon virtualities in the range Q^2 > 25 GeV^2. Energy and transverse-energy flows around the jet axis are presented. The cross section is presented as a function of \beta, the Bjorken variable defined with respect to the diffractive exchange and, in bins of \beta, as a function of \phi, the angle between the \gamma^*-dijet plane and the \gamma^*-e plane in the rest frame of the dijet final state. The results are compared to predictions from models which are based on different assumptions about the nature of the diffractive exchange. The cross section of the diffractive process ep -> eXp is measured at a centre-of-mass energy of 318 GeV, where the system X contains at least two jets and the leading final state proton p is detected in the H1 Very Forward Proton Spectrometer. The measurement is performed in photoproduction with photon virtualities Q^2<2 GeV^2 and in deep-inelastic scattering with 4<Q^2<80 GeV^2. The results are compared to NLO QCD calculations based on diffractive parton distribution functions as extracted from measurements of inclusive cross sections in diffractive DIS. A complementary process, ZEUS present measurements of the diffractive production of isolated ("prompt") photons in photoproduction, with and without a jet. Cross sections are evaluated for centrally produced photons with jets as a function of the photon and jet transverse energy and pseudorapidity, and also for the fraction of incoming photon energy imparted to the photon-jet system. Comparison is made to predictions from Rapgap. A measurement is presented dijet cross sections in diffractive deep-inelastic ep scattering at HERA using data collected by the H1 experiment. The investigated phase space is spanned by the photon virtuality in the range of 4<Q2<100 GeV2 and by the fractional proton longitudinal momentum loss x_pom<0.03. The resulting cross sections are compared with NLO QCD predictions based on diffractive PDFs and the value of the strong coupling constant is extracted.

Speaker: Dr Alice Valkarova (Institute of Particle and Nucelar Physics, Charles University)

Paper ISMD_valkarova-3.pdf

Slides valkarova_ISMD.pdf

17:30 Breakdown of QCD factorization in hard diffraction

Production of heavy photons (Drell-Yan), gauge bosons, Higgs bosons, heavy flavors, which is treated within the QCD parton model as a result of hard parton-parton collision, should be treated as a bremsstrahlung process seeing in the rest frame of the target. The main observation is a dramatic breakdown of diffractive QCD factorization due to the interplay between soft and hard interactions, which dominates these hard diffractive processes.

Speaker: Prof. Boris Kopeliovich (UFTSM)

Paper kopeliovichISMD2015.pdf

Slides kopeliovich.pdf

18:30 → 20:30 Poster session

18:30 Colour Inside Environment

V.I.Kuvshinov It is shown that in the model of stochastic QCD vacuum colour quark confinement can be described as decoherence of pure colour state of the particle into the mixed quantum state with equal probabilities for different colours as a result of density marix evolution. Quantum functions of Purity, Fidelity and Fon Neiman entropy for one- and multi-particles states are calculated.

Speaker: Prof. Viacheslav Kuvshinov (NAS)

18:35 Jet production in the ColorFul NNLO framework

In this talk I present the computer implementation of a general framework for NNLO calculations using the ColorFul NNLO subtraction scheme. This implementation identifies all singular regions automatically, assigns counter terms to them and if equipped with a phase space integrator, provides predictions for any IR-safe differential observable. The numerical framework will be illustrated through the case of 3-jet production in electron-positron annihilation.

Speaker: Dr Adam Kardos (University of Debrecen)

18:40 Flavor Tagging TeV Jets for BSM and QCD

We present a new scheme for tagging b-jets with p_T > 500 GeV called "mu_x tagging." At the LHC, the primary method to tag b-jets relies on tracking their charged constituents. However, when highly boosted, track-based b-tags lose efficiency, and the probability to mistag light jets rises dramatically. Using muons from B hadron decay and defining a particular combination "x" of angular information and boost estimation, we find fairly flat efficiencies to tag b-jets, c-jets and light-jets of e_b = 14%, e_c = 6.5%, and e_light = 0.65%, respectively. We demonstrate the usefulness of this new scheme by showing the reach for discovery of a leptophobic Z' in the dijet channel.

Speaker: Prof. Zack Sullivan (Illinois Institute of Technology)

Paper ISMD15_Sullivan.pdf

18:45 Event-by-event dynamical fluctuations of K/π, p/π, and K/p in Pb-Pb collisions with ALICE

Non-statistical event-by-event fluctuations in relativistic heavy ion collisions have been proposed as probe of phase instabilities near the QCD phase transition. The observable νdyn, which is given in terms of the moments of identified-particle multiplicity distributions, is used to quantify the magnitude of the dynamical fluctuations in event-by-event measurements of given particle ratios. The ALICE detector at the LHC is well suited for the study of νdyn, due to its excellent particle identification capabilities. Particle identification that is based on the measurement of the specific ionization energy loss dE/dx works well on a statistical basis, however, suffers from ambiguities when applied on the event-by-event level. A novel experimental technique called the "Identity Method" was recently proposed to overcome such limitations. In this contribution, we will present results for νdyn for K/π, p/π, and K/p, which applies the Identity Method to Pb-Pb data from ALICE.

Speaker: Mr Sumit BASU (Variable Energy Cyclotron Centre)

Poster 2015-Sep-29-conferencefile-ISMD_Ebye_Particle_Ratio_Fluct_(1).pdf

18:50 Status and prospects of the search for neutrinoless double-beta decay with the CUORE experiment

The CUORE experiment, expected to start operations in early 2016, will search for neutrinoless double beta decay of 130Te and will be one of the most competitive neutrinoless double beta decay experiments in the near future. Its demonstrator (CUORE-0) has reported in 2015 no evidence for neutrinoless double-beta decay and placed a lower bound on the decay half-life, T(0ν)1/2>2.7×10^24 yr at 90% C.L. The CUORE projected sensitivity is 9.5×10^25 yr at the 90% confidence level, which corresponds to an upper limit on the effective Majorana mass in the range of 50–130 meV. I will discuss the status of the CUORE experiment and give a brief update on the background rejection techniques that may significantly improve the search sensitivity of bolometric detectors to fully explore the inverted neutrino mass hierarchy.

Speaker: Mr Niccolo Moggi (University of Bologna)

18:55 Recent results on low-energy e+e- annihilation into hadrons obtained using initial state radiation with the BABAR detector

The BABAR Collaboration has an extensive program of studying hadronic cross sections in e+e- collisions at low-energies, which are accessible at center-of-mass energy of about 10.6 GeV via initial-state radiation. Our measurements allow significant improvements in the precision of the predicted value of the muon anomalous magnetic moment. We report here the most recent results on several processes, including e+e- -> K_S K- pi+ pi0 and e+e- -> K_S K- pi+ eta. Each cross section is measured up to 4.5 GeV and the internal structure of the final hadronic states is studied. With the same technique we have also studied the charge asymmetry in the e+e- -> pi+pi- and mu+mu- reactions. The measured asymmetry is compared with QED predictions for muons, and theoretical models for pions. A clear interference pattern is observed for pions in the vicinity of the f_2(1270) resonance.

Speaker: fabio anulli (INFN Sezione di Roma)

19:00 Combined analysis of charm-quark fragmentation-fraction measurements

A summary of measurements of the fragmentation of charm quarks into a specific hadron is given. Measurements performed in photoproduction and deep inelastic scattering in e+-p, pp and e+e- collisions are compared, using up-to-date branching ratios. Within uncertainties, all measurements agree, supporting the hypothesis that fragmentation is independent of the specific production process. Presented averages of the fragmentation fractions significantly improved precision compared to the individual measurements. Implications of results for other physical quantities' measurements are considered.

Speaker: Dr Andrii Verbytskyi (Max-Planck-Institut für Physik)

Poster FFC-ISMD2015-poster.pdf

Proceedings FFC-ISMD2015-proceedings.pdf

19:05 Associated quarkonium production at ATLAS as a new probe of QCD

We present new measurements of the associated production of quarkonium with a vector boson or an additional quarkonium state using the ATLAS Run-1 dataset. These rare processes provide new insight into QCD models of quarkonium production, but also provide new opportunities to study double parton scattering, including cross-section measurements in single and double parton scattering dominated regimes and a precise assessment of the sigma_eff parameter governing the effective spatial area of parton-parton interactions at a variety of energy scales.

Speaker: Prof. Dick Greenwood (ATLAS)

19:10 Studying bb~ production and small angle correlations in the J/psi + mu final state

We present a new measurement of BBbar hadron production at the LHC using the inclusive decay modes B(Bbar)->Jpsi+X->mumu+X and Bbar(B)- >mu+X. Using this three muon final state differential cross sections are presented, giving new constraints on B hadron production kinematics in particular at small separation angles between the bb~ pair. Further corrections are also determined to allow theory comparisons directly at the B hadron level.

Speaker: Prof. Dick Greenwood (ATLAS)

19:15 PERSPECTIVE STUDY OF EXOTICS AND BARYONS WITH CHARM AND STRANGENESS

The spectroscopy of exotics states with hidden charm together with the spectroscopy of charmed and stranged baryons is discussed. It is a good testing tool for the theories of strong interactions, including: QCD in both the perturbative and non-perturbative regimes, LQCD, potential models and phenomenological models. An understanding of the baryon spectrum is one of the primary goals of non-perturbative QCD. For this purpose an elaborated analysis of charmed hybrids and tetraquark spectrum together with spectrum of charmed and strange baryons is given. The recent experimental data are analyzed. But much more data on different decay modes are needed before firmer conclusions can be made. These data can be derived directly from the experiments using a high quality antiproton beam with momentum up to 15 GeV/c planned at FAIR and proton-proton collisions with momentum up to 26 GeV/c planned at the superconducting accelerator complex NICA that is being built in Dubna nowadays.

Speaker: Dr Mikhail Barabanov (JINR)

6 ISMD_BARAB_.pdf

19:20 The weighted GMD for multiplicity distributions at LHC energies

A new distribution is obtained from the Generalised Multiplicity Distribution (GMD). This distribution is derived by a weighted sum of the GMD over the initial number of gluons, removing the dependence of the model on a specific initial state for QCD evolution. The distribution is shown to describe multiplicity data at various LHC energies, possibly providing information on gluon production. Comparisons are made with other multiplicity distribution models.

Speaker: Mr Wei Yang Wang (National University of Singapore (NUS))

Paper templateISMD2015.pdf

Poster ISMDposter.pdf

19:25 A convoluted Generalized Multiplicity Distribution and associated phenomenologically analogous Lee-Yang phase transitions

A new distribution is obtained from a convolution of the Generalized Multiplicity Distribution (GMD) with the Negative Binomial Distribution (NBD). This distribution models the charged particle production from hard and soft processes, with comparisons made with other multiplicity distribution models. A phenomenologically analogous Lee-Yang phase transition is examined using the new model.

Speaker: Mr Qixiang Leong (National University of Singapore)

Poster ISMD_poster_QLeong.pdf

19:30 Particle production beyond the thermal model

The statistical hadronization (or thermal) model yields good results when compared to e.g. hadron production rates in LHC heavy-ion data. However, the distribution functions in p_T, rapidity y and eta clearly show deviations from thermal behaviour. Such non-equilibrium effects can to a certain extent be accounted for in a relativistic diffusion model with three sources - two fragmentation sources, and a mid-rapidity source arising from gluon-gluon collisions - that merges with the thermal model only for time to infinity. Given the short interaction times of AuAu at RHIC or PbPb at LHC, the fragmentation sources still contribute substantially, providing good results when compared to dN/deta distributions for produced charged hadrons from PHOBOS and ALICE, and also for asymmetric systems such as dAu at RHIC and pPb at LHC. The particle content of the sources is investigated as function of sqrt(s_NN) and found to differ substantially for central and fragmentation sources.

Speaker: Prof. Georg Wolschin (Institut für Theoretische Physik)

Paper wolschin_ISMD2015.pdf

Poster ISMD15_poster_wolschin.pdf

19:35 Systematic study of real photon and Drell-Yan pair production in p+A (d+A) interactions

We investigate nuclear effects in production of Drell-Yan pairs and direct photons in proton-nucleus collisions. For the first time, these effects are studied within the color dipole approach using the Green function formalism which naturally incorporates the color transparency and quantum coherence effects. Numerical results for the nuclear modification factor are compared with available data. Besides, we present a variety of predictions for the nuclear suppression as function of transverse momentum pT, rapidity and invariant mass of the lepton pair that can be verified by experiments at RHIC and LHC. We found that the nuclear suppression is caused predominantly by effects of quantum coherence (shadowing corrections) and by the effective energy loss induced by multiple initial state interactions. Whereas the former dominates at small Bjorken x2 in the target, the latter turns out to be significant at large x1 in the projectile beam and is universal at different energies and pT.

Speaker: Mr Michal Krelina (FNSPE, Czech Technical University in Prague)

Paper ISMD2015-green.pdf

Poster poster-krelina

19:40 Nuclear effects in direct photon and Drell-Yan production at the LHC

Using the color dipole formalism we study production of direct photons and Drell-Yan pairs in pA interactions. Real photons and lepton pairs produced in a hard scattering are not accompanied with any final state interaction, either energy loss or absorption. Consequently, the associated observables may serve as more efficient and cleaner probes for nuclear modification effects than inclusive hadron production. We have shown that shadowing effects in production of lepton pairs coming from the coherence are suppressed at large invariant masses and at very large pT at mid-rapidities. Besides, we present a systematic analysis of the nuclear effects and perform predictions for nuclear suppression as a function of pT, rapidity and dilepton invariant mass that can be verified by the LHC experiments. We include and analyze also a contribution of coherent effects associated with gluon shadowing affecting the observables predominantly at small and medium-high pT.

Speaker: Dr Victor Goncalves (Lund University/Sweden and UFPel/Brazil)

5 epjconf_copyright_victor2.pdf

Paper ISMD2015-lhc.pdf

19:45 Two Component model for hadroproduction: from pp to heavy-ion collisions

The transverse momentum spectra of hadrons produced in high energy collisions can be decomposed into the two components: the exponential ("thermal") and the power ("hard") ones. Thus, charged hadron spectra produced in proton-proton and heavy-ion collisions from ISR to LHC are considered simultaneously within this model. The parameters of the model are found to vary with the type of the collision, the charged multiplicity and the measured pseudorapidity region. We discuss the possible origin of this effect, and speculate that it is linked to confinement. Moreover, the proposed model allows to extract the thermal hadron production from the whole statistical ensemble and for the case of heavy-ion collisions the change in the particle production dynamics is observed when reaching the critical temperature. Finally, the observed dependences are used to make predictions on the charged hadron production at LHC-energies, which are tested on already available experimental data.

Speaker: Dr Alexander Bylinkin (MIPT)

Poster TC_Model1.pdf

19:50 Relativistic second-order dissipative fluid dynamics at finite chemical potential

Starting from the Boltzmann equation in the relaxation time approximation and employing a Chapman-Enskog like expansion for the distribution function close to equilibrium, we derive second-order evolution equations for the shear stress tensor and the dissipative charge current for a system of massless quarks and gluons. The transport coefficients are obtained exactly using quantum statistics for the phase space distribution functions at non-zero chemical potential. We show that the second-order evolution equations for the shear stress tensor and the dissipative charge current can be decoupled. We find that for large chemical potential, the charge conductivity is small compared to the coefficient of shear viscosity. Moreover, we also show that the limiting behaviour of the ratio of heat conductivity to shear viscosity is qualitatively similar to that obtained for a strongly coupled conformal plasma. [1] A. Jaiswal, B. Friman and K. Redlich, arXiv:1507.02849 [nucl-th].

Speaker: Dr Amaresh Jaiswal (GSI Helmholtzzentrum für Schwerionenforschung)

Paper ISMD2015_CCE.pdf

Poster poster.pdf

19:55 Global and Local Temperature Fluctuations in High Energy Heavy-ion Collisions

Temperature fluctuations may have two distinct origins, first, quantum fluctuations that are initial state fluctuations, and second, thermodynamical fluctuations. We discuss a method of extracting the thermodynamic temperature from the mean transverse momentum of pions, by using controllable parameters such as centrality of the system, and range of the transverse momenta. Event-by-event fluctuations in global temperature over a large phase space provide the specific heat of the system. We present Beam Energy Scan of sp. heat from data, AMPT and HRG model prediction.The production of a large number of particles in every event, it is possible to divide the phase space into small bins and obtain local temperature for each bin. The origin of the local fluctuations has been studied with the help of event-by-event hydrodynamic calculations, which diminishes with the elapse of time. We discuss the hydrodynamic calculations and a feasibility study at LHC using AMPT simulated data.

Speaker: Mr Sumit BASU (Variable Energy Cyclotron Centre)

Poster ISMD_poster_sumit.pdf

18:30 → 20:30 Welcome reception and buffet dinner

Tuesday, 6 October

07:30 → 09:00 Breakfast

09:00 → 10:30 Lunch break

10:30 → 14:05 Astroparticle Physics

Conveners: Dr Antonella Castellina (INAF and INFN), Dmitri Semikoz (APC, Paris)

10:30 Searches for Dark Matters at the ATLAS experiment

Searches for strongly produced dark matters in events with jets, photons, heavy-flavor quarks or massive gauge bosons recoiling against large missing transverse momentum in ATLAS are presented. These “MET+X” signatures provide powerful probes to dark matter production at the LHC, allowing us to interpret results in terms of effective field theory and/or simplified models with pair production of WIMPs. Recent ATLAS results on dark matter searches at LHC Run I and the connection to astroparticle physics are discussed.

Speaker: Dr Henso Abreu (Israel Institute of Technology (IL))

Proceedings ATL-PHYS-PROC-2015-193.pdf

Slides darkmatter_ismd2015_habreu.pdf

10:50 Extensive Air Shower and cosmic ray physics above 10^17 eV

Cosmic Rays above 10^17 eV allow studying hadronic interactions at energies that can not be attained at accelerators yet. At the same time hadronic interaction models have to be applied to the cosmic-ray induced air-shower cascades in atmosphere to infer the nature of cosmic rays. The reliability of air-shower simulations has become the source of one of the largest systematic uncertainty in the interpretation of cosmic-ray data due to the uncertainties in modeling the hadronic interaction driving the air-shower development. In this presentation a review will be done on the current understanding of the nature of cosmic rays above 10^17 eV, and on role of air showers as probes to test hadronic interaction models at energies well beyond those achieved at accelerators.

Speaker: Prof. Mario Bertaina (University of Torino and INFN Torino)

Paper bertaina-ismd2015.pdf

Slides bertaina-ismd2015.pdf

11:15 Measurements at LHC an their relevance for ultra-high energy cosmic rays

Many LHC measurements have already been used to improve hadronic interaction models and thus lowered the model dependence of cosmic ray data analyses. However, the LHC still has a lot more potential to provide crucial information, which has not been fully exploited so far. Since the start of Run2 the highest accelerator beam energies are reached and no further increase can be expected for a long time. First data of Run2 are published and the fundamental performance of cosmic ray hadronic interaction models is scrutinized. The relevance of LHC data in general for cosmic ray data analyses is demonstrated. It is also shown in what aspects the current measurements are still incomplete and how they can be further improved.

Speaker: Ralf Ulrich (KIT)

Slides RalfUlrich.pdf

11:40 Cosmic ray interaction models: an overview

I shall review the state-of-the-art concerning the treatment of high energy cosmic ray interactions in the atmosphere, discussing in some detail the underlying physical concepts and presenting a comparison of model results with selected accelerator data. Further, the relation of basic characteristics of hadronic interactions with the properties of nuclear-electromagnetic cascades induced by primary cosmic rays in the atmosphere will be addressed.

Speaker: Dr Sergey Ostapchenko (Frankfurt Institute for Advanced Studies (FIAS))

Paper ismd-ostapchenko.pdf

Slides ismd15-ostapchenko.pdf

12:05 coffee

12:35 Measurement of the muon content in air showers at the Pierre Auger Observatory

The muon content of extensive air showers produced by the ultra-high energy cosmic rays is an observable sensitive to the composition of the primary particle and to the properties of hadronic interactions driving the air-shower cascade. We present different methods to estimate the muon number at the ground and the muon production depth using measurements of the longitudinal, lateral, and temporal distribution of particles in the air showers recorded by the Pierre Auger Observatory. The results, obtained at about 140TeV center-of-mass energy for proton primaries, are compared to the predictions of LHC-tuned hadronic interaction models for different primary masses. The models exhibit a deficit in the predicted muon content. The Pierre Auger Observatory is a hybrid detector sensitive to muons and the combination of these results with other independent mass composition analyses such as Xmax provides additional constraints on hadronic interaction models for energies beyond the LHC reach.

Speaker: Dr Darko Veberic (Institute for Nuclear Physics, Karlsruhe Institute of Technology)

Paper veberic-auger_muons.pdf

Slides veberic-ismd-auger_muon_content.pdf

12:55 Measurements of the proton-air cross section with high energy cosmic ray experiments.

Detecting Ultra High Energies Cosmic Rays (UHECRs) enables us to measure the proton-air inelastic cross section $\sigma^{\rm inel}_{\rm p-air}$ at energies that we are unable to access with particle accelerators. The proton-proton cross section $\sigma_{\rm p-p}$ is subsequently inferred from the proton-air cross section at these energies. UHECRs experiments have been reporting on the proton-air inelastic cross section starting with the Fly's Eye in 1984 at $\sqrt s = 30$~TeV and ending with the most recent result of the Telescope Array experiment at $\sqrt s = 95$~TeV in 2015. In this talk, I will present the methods and experimental results from some of these experiment.

Speaker: Dr Rasha Abbasi (University of Utah)

ProccedingPDF File RashaISMD2015.pdf

Slides Rabbasi_isdm.pdf

13:15 High energy neutrinos from the Cosmos: Recent results from the IceCube Neutrino Telescope

The neutrino observatory IceCube is opening a new observational window to the Universe. IceCube, which has been constructed in the icecap at the South Pole, is taking data since Spring 2011 in full configuration. The first years of data reveled the existence of extremely high neutrinos at the PeV scale. The observed diffuse neutrino flux is with high probability of astrophysical origin. In this talk I will summarize the recent observation and discuss the on-going searches for counterparts focusing in particular on the discussion of BL Lacs.

Speaker: Prof. Elisa Resconi (TU Munchen)

Slides Resconi_ISMD_2015.pdf

13:35 Theoretical Interpretations of IceCube Results

IceCube telescope has detected ~TeV-PeV neutrinos of astrophysical origin. Currently, their origin is still unknown. In this talk, we will review the main recent theoretical explanations for these high-energy neutrinos. Both scenarios of a Galactic origin (such as the Fermi bubbles, cosmic rays in the halo, or other Galactic sources) and of an extragalactic origin (such as active galactic nuclei, starburst galaxies, or some types of supernovae) will be discussed. These results will also be presented in the context of multi-messenger astronomy: We will show how observations of gamma-rays and cosmic rays could help disentangle between the different scenarios.

Speaker: Dr Gwenael Giacinti (MPIK, Heidelberg)

Slides Giacinti_ISMD_WildbadKreuth.pdf

13:55 → 18:15 High Energy and High Pt Interactions

Conveners: Mr Maxime Gouzevitch (IPNL, Lyon), Mr Stefan Hoeche (SLAC National Accelerator Laboratory)

14:00 Measurement of observables sensitive to coherence effects in hadronic Z decays with the OPAL detector at LEP

A study of QCD coherence is presented based on a sample of about 397,000 e+e- hadronic annihilation events collected at sqrt{s} = 91 GeV with the OPAL detector at LEP. The study is based on four recently proposed observables that are sensitive to coherence effects in the perturbative regime. The measurement of these observables is presented, along with a comparison with the predictions of different parton shower models. The models include both conventional parton shower models and dipole antenna models. Different ordering variables are used to investigate their influence on the predictions.

Speakers: Stefan Gieseke (KIT), Dr Stefan Kluth (MPI für Physik)

Paper opalpartonshower_proceedings.pdf

Slides opalpartonshower_talk.pdf

14:20 Recent developments in Monte-Carlo Event Generators

With Run II of the LHC having started, the need for high precision theory predictions whose uncertainty matches that of the data to be taken necessitated a rage of new developments in Monte-Carlo Event Generators. In this talk I will give an overview of the progress in recent years in the field and what can and cannot be expected from these newly written tools.

Speaker: Marek Schoenherr (University of Zurich)

Paper ISMD2015-MarekScheonherr.pdf

Slides Marek_Schoenherr_ISMD2015.pdf

14:45 Latest results on top production from the CMS and ATLAS collaborations: nclusive and differential measurements

In proton-proton collisions at the LHC, pairs of top and anti-top quarks are expected to be mostly produced through gluon fusion and the large number of ttbar pairs can be used to test the predictions of Quantum Chromodynamics. Measurements of the top quark production cross sections in proton-proton collisions at 7 and 8 TeV with the ATLAS and CMS detectors at the Large Hadron Collider are presented. Both inclusive and differential cross-section measurements are compared to the theoretical predictions. We also present measurements of the spin correlation between top and anti-top quarks as well as of the top-quark charge asymmetry which constitute important tests of QCD and are sensitive to potential contributions from new physics. Besides being compared to different predictions from the standard model the measurements the results are also used to extract the strong coupling constant and the pole mass.

Speaker: Prof. Enrico Tassi (Universita' della Calabria and INFN-Cosenza)

Slides ISDM2015-ETassi-v3.pdf

15:10 Supersymmetry searches at LHC in hadronic final states

Despite the absence of experimental evidence, weak scale supersymmetry remains one of the best motivated and studied Standard Model extensions. This talk summarises recent ATLAS and CMS results for searches for supersymmetric (SUSY) particles, with an emphasis on strong production in both R-Parity conserving and R-Parity violating SUSY scenarios. The searches involve final states including jets, missing transverse momentum, light leptons, taus or photons. A particular emphasise will be given to the fully hadronic SUSY searches their backgrounds and problematics related to the way that they are estimated. Sensitivity projections for the data that will be collected in 2015 are also presented.

Speaker: Sascha Caron (Nikhef and Radboud University Nijmegen)

Slides Bavaria2015_SUSY.pdf Bavaria2015_SUSY.pptx

16:00 Coffee Break

16:30 Measurements of Vector Boson plus jets with the ATLAS and CMS detectors

The production of vector bosons (V = W, Z or ?) in association with jets is a stringent test of perturbative QCD and is a background process in searches for new physics. The differential cross-section measurements measurements from CMS and ATLAS collaborations would be presented. The multijet topologies and event shape variables represent a particular interest to test multi-leg LO and NLO MC predictions interfaced with parton showers and study the resummation techniques.

Speaker: Mr Vieri Candelise (Univ. di Trieste e Sez. dell'INFN, Italy)

Paper ismd2015_candelise.pdf

Slides MP2015.pdf

16:55 Resummed Results for Hadron Collider Observables

This talk will provide a summary of progress in the resummation of observables for hadron colliders, focusing in particular on event shape observables. Event shapes and jet rates are invaluable QCD tools for theoretical calculations and experimental measurements. I will revise the definition of these observables in hadron collisions, and give a review of the state-of-the-art results for their resummation. Then I will detail how recent work on the resummation of event shapes in electron-positron annihilation can allow us to extend resummation of generic hadronic event shapes to NNLL accuracy.

Speaker: Ms Heather McAslan (University of Sussex)

Paper MCASLAN_proc.pdf

Slides MCASLAN_ISMD2015.pdf

17:20 Studies of jet cross-sections and production properties with the ATLAS and CMS detectors

Several aspects of jet production in pp collisions have been measured by the ATLAS and CMS collaborations. The jet production cross sections probe the dynamics of QCD and can constrain the parton proton structure. Double-differential cross sections for inclusive, di-, three- and four-jet final states are measured at different centre-of-mass energies of pp collisions with the ATLAS detector and are compared to expectations based on NLO QCD calculations. The distribution of the jet charge has been measured in dijet events using pp collision data at 8 TeV with the ATLAS detector. Jet-jet energy correlations are sensitive to the strong coupling constant. Measurements of multi-jet systems with a veto on additional jets, probe QCD radiation effects. These measurements constitute precision tests of QCD in a new energy regime. Studies of large-radius jet properties including N-subjettines, splitting scales and other jet substructure related quantities will be presented.

Speaker: Mr Nuno Anjos (IFAE (Barcelona))

Paper NAnjosISMD2015.pdf

Slides Nuno.Anjos.XLV.ISMD.151006_v2.pdf

17:45 Search for QCD Instanton-Induced Processes in DIS at HERA

Signals of QCD instanton-induced processes are searched for in deep-inelastic scattering (DIS) at the electron-proton collider HERA in the kinematic region defined by the Bjorken-scaling variable x > 10^{-3}, the inelasticity 0.2< y < 0.7 and the photon virtuality 150 < Q^2 < 15000 GeV^2. The search is performed using H1 data corresponding to an integrated luminosity of ~350 pb^{-1}. Several observables of the hadronic final state of the events are exploited to identify a potentially instanton-enriched domain. Two Monte Carlo models, RAPGAP and ARIADNE, are used to estimate the background from the standard DIS processes, and the instanton-induced scattering processes are modeled by the program QCDINS. In order to extract the expected signal a multivariate data analysis technique is used.

Speaker: Dr Hayk Pirumov (DESY)

Slides pirumov_ismd_071015.pdf

18:30 → 20:30 Dinner

Wednesday, 7 October

07:30 → 09:00 Breakfast

09:00 → 12:30 Collective Phenomena in High Energy Collisions

Conveners: Dr Anton Andronic (GSI Darmstadt), Wojciech Florkowski (Institute of Nuclear Physics)

09:00 A viscous blast-wave model for high energy heavy-ion collisions

Using a viscosity-based survival scale for geometrical perturbations formed in the early stages of relativistic heavy-ion collisions, we model the radial flow velocity during freeze-out. Subsequently, we employ the Cooper-Frye freeze-out prescription, with first-order viscous corrections to the distribution function, to obtain the transverse momentum distribution of particle yields and flow harmonics. For initial eccentricities, we use the results of Monte Carlo Glauber model. We fix the blast-wave model parameters by fitting the transverse momentum spectra of identified particles at the Large Hadron Collider (LHC) and demonstrate that this leads to a fairly good agreement with transverse momentum distribution of elliptic and triangular flow for various centralities. Within this viscous blast-wave model, we estimate the shear viscosity to entropy density ratio $\eta/s\simeq 0.24$ at the LHC. [1] A. Jaiswal and V. Koch, arXiv:1508.05878 [nucl-th].

Speaker: Dr Amaresh Jaiswal (GSI Helmholtzzentrum für Schwerionenforschung)

Paper ISMD2015_VBW.pdf

Slides Presentation.pdf

09:20 Multiplicity dependence of strange and multi-strange hadron production in pp collisions at sqrt{s} = 7 TeV measured with the ALICE experiment

The measurement of identified particle production rates as a function of event activity in small colliding systems has recently become of particular interest in understanding how observations performed in these systems relate to the much larger ones created in Pb-Pb collisions. Strangeness production may provide a valuable tool to probe changes in particle production mechanisms. We report on measurements of the transverse momentum spectra of strange hadrons in pp collisions at 7 TeV with ALICE. To investigate the possibility of collective-like behavior, we study how the pT-differential Lambda/K^0_S ratio is altered with multiplicity. Furthermore, strangeness production is seen to be enhanced with respect to non-strange particles in pp collisions with progressively higher multiplicity, as evidenced by rising hyperon-to-pion ratios. These observations are compared to similar measurements performed in p-Pb and Pb-Pb collisions as well as to predictions from QCD-inspired models.

Speaker: Dr Rafael Derradi de Souza (State University of Campinas - Brazil)

Slides RDdeSouza_ISMD2015.pdf

09:40 Recent results from NA61/SHINE

The aim of the NA61/SHINE ion programme is to explore the phase diagram of strongly interacting matter. The main physics goals are the study of the onset of deconfinement and the search for the critical point of strongly interacting matter. These goals are pursued by performing an beam momentum (13A - 158A GeV/c) and system size (p+p, p+Pb, Be+Be, Ar+Sc, Xe+La) scan. This contribution reviews results and plans of the NA61/SHINE experiment. In particular, recent inclusive spectra of identified hadrons in inelastic p+p and centrality selected Be+Be interactions at the SPS energies will be shown. The energy dependence of the signals of deconfinement, the "horn", "step" and "kink", show interesting behaviour in p+p interactions. Furthermore, the Be+Be data suggest collective flow to develop even in collisions of relatively light nuclei.

Speaker: Mr Emil Kaptur (University of Silesia)

Slides prezentacja.pdf

10:00 Overview of quarkonium production in heavy-ion collisions at LHC

Quarkonium has been regarded as one of the golden probes for the deconfined phase transition to the quark-gluon plasma (QGP) since late 80's when the relativistic heavy-ion experiments started at AGS and SPS. The heavy quarkonia can be generated in gluon-gluon scatterings at early stage of the collision as the large momentum transfer is required. Later the binding potential between a quark and antiquark in quarkonium is screened by surrounding light quarks and antiquarks. Thus, the various quarkonium states are expected to be melt at different temperatures depending on their binding energies, which allows us to characterize the QCD phase transition. The suppression of the J/psi and Upsilon yields in Pb + Pb collisions was observed at the Large Hadron Collider (LHC). In this presentation, we review the quarkonium data at LHC, and discuss possible implications related to the propagation of quarkonia in the deconfined hot, dense matter.

Speaker: Prof. Byungsik Hong (Korea University)

Paper text_h2.pdf

Slides Hong_ISMD_final.pdf

10:20 Strong-Coupling Effects in a Plasma of Confining Gluons

For the first time we investigate non-equilibrium dynamic properties of a plasma consisting of confining gluons resulting from Gribov quantization [1]. For this purpose we employ the infrared-improved Gribov dispersion relation of gluons in the kinetic theory setup in the relaxation time approximation and determine the exact in- and out-of-equilibrium evolution of the system. In the static case the resulting equation of state of the studied system provides a good qualitative description of the pure-glue lattice QCD data down to the vicinity of the phase transition [2,3,4], thus permitting a study of the non-equilibrium phenomena in a plasma that exhibits crucial features of the QCD phase transition. In the case of local thermal equilibrium we observe Bjorken-like cooling of the boost-invariant expanding system. Out of equilibrium, by matching to the first order viscous hydrodynamics, we calculate bulk [3] and shear [5] viscosity of the system. We find significant enhancement of the bulk to shear viscosity ratio close to the transition temperature and its universal scaling behavior, in line with the one expected in a strongly-coupled theories [5]. We interpret the onset of strongly-coupled features in the system as the possible explanation of the close to perfect fluid behavior of the quark-gluon plasma. References: [1] V. Gribov, Nucl. Phys. B 139, 1 (1978) [2] D. Zwanziger, Phys. Rev. Lett. 94, 182301 (2005) [3] W. Florkowski, R. Ryblewski, N.Su, K.Tywoniuk, arXiv:1504.03176, [4] S. Borsanyi, G. Endrodi, Z. Fodor, S. D. Katz and K. K. Szabo, JHEP 1207, 056 (2012) [5] W. Florkowski, R. Ryblewski, N.Su, K.Tywoniuk, arXiv:1509.01242.

Speaker: Wojciech Florkowski (Institute of Nuclear Physics)

Paper florkowski_ismd2015.pdf

Slides ismd-florkowski.pdf

10:40 Coffee break

11:10 New results on collective phenomena in small colliding systems at CMS

New results of two- and multi-particle correlations in pp and pPb collisions will be presented. The measurements are performed as a function of multiplicity. In very-high-multiplicity events, a long-range near-side two-particle correlation is observed. Azimuthal anisotropy harmonics (v_n) are extracted as a function of eta, pT and multiplicity, using two- and multi-particle correlations. Identified particle v_2 and v_3 are also studied for strange hadrons. Possible physics implications of the data are discussed in the context of various theoretical models. New results of two-particle correlations in pp collisions at 13 TeV are compared to lower energy data to study the energy dependence of long-range correlation phenomena.

Speaker: Zhenyu Chen (CMS)

Slides ISMD15_Zhenyu_v1.pdf

11:30 LHCb results from proton ion collisions

Proton-lead and lead-proton data taking during 2013 has allowed LHCb to expand its physics program to heavy ion physics. Results include the first forward measurement of Z production in proton-lead collisions as well as a measurement of the nuclear modification factor and forward-backward production of prompt and displaced J/psis, Psi(2S) and Upsilons. Angular particle correlations have also been measured for events of varying charged particle activity.

Speaker: Laure Marie Massacrier (Orsay-LAL)

Paper templateISMD2015_v2.pdf

Slides ISMD_massacrier_v2.pdf

11:50 De-Confinement in small systems: Clustering of color sources in high multiplicity pbar-p collisions at sqrt{s}= 1.8 TeV

It is shown that de-confinement can be achieved in high multiplicity non jet $\bar{p}p$ collisions at $\sqrt{s}$= 1.8 TeV Fermi National Accelerator Laboratory(FNAL- E735) experiment. In this paper we use the same data but analyze the transverse momentum spectrum in the framework of the clustering of color sources. This frame-work naturally predicts the reduction in the charged particle multiplicity with respect to the value expected from the number of independent strings. The initial temperature and energy density are obtained from the data via the color reduction factor $F(\xi)$ and the associated string density parameter $\xi$. The energy density ($\varepsilon/T^{4}$) $\sim$ 11.5 for $ \langle dN_{c}/d\eta \rangle \sim $ 25.0 is close to the value for 0-10\% central events in Au+Au collisions at $\sqrt{s_{NN}}$= 200 GeV. The shear viscosity to entropy density ratio($\eta/s$) is $\sim$ 0.2 at the transition temperature of 167 MeV.

Speaker: Prof. L Gutay (Purdue University)

Paper ISMD2015_Laslo.pdf

Slides ISMD2015.pdf ISMD2015.pptx

12:10 p-p minimum-bias dijets and nonjet quadrupole in relation to conjectured collectivity (flows) in high-energy nuclear collisions

Recent observations of ridge-like structure in p-p and p-A angular correlations at the RHIC and LHC are interpreted to imply collective motion in smaller systems. It is argued that if correlations representing flows in A-A collisions appear in smaller systems collectivity must extend to the smaller systems. But the argument could be reversed to conclude that such structures appearing in A-A collisions may not imply flows. In this talk I present spectrum, correlation and fluctuation data from RHIC p-p and Au-Au collisions and p-p, p-Pb and Pb-Pb results from the LHC described accurately by a two-component (soft+dijet) model of hadron production. I also present a significant p-p nonjet (NJ) quadrupole (v2) component with nch systematics directly related to A-A quadrupole systematics. The combined data suggest that soft, dijet and quadrupole components are independent of one another in all cases, inconsistent with hadron production from a common bulk medium exhibiting collective motion.

Speaker: Prof. Thomas Trainor (University of Washington)

Paper trainor-ismd2015.pdf

Slides trainor-ismd2015.pdf

12:30 → 14:00 Lunch break

14:00 → 18:00 Excursion: Boat tour on the lake (Tegernsee)

14:00 assemble in front of building for conference photograph
14:15: coach departs from Wildbad Kreuth
14:45 boat leaves Rottach-Egern
16:15 boat returns to Rottach-Egern
16:30 coach leaves for Wildbad Kreuth

18:00 → 23:00 Conference Dinner at "Gut Kaltenbrunn"

18:00 coach departure from Wildbad Kreuth
18:30 dinner
22:30 coach leaves for Wildbad Kreuth
23:00 arrival at Wildbad Kreuth

Thursday, 8 October

07:30 → 09:00 Breakfast

09:00 → 13:05 Status of QCD

Conveners: Prof. Guenther Dissertori (ETH Zurich), Nora Brambilla (Technical University Munich)

09:00 Deconfinement and Equation of State in QCD

I will review the current status of equation of state calculations and deconfinement transition in 2+1 flavor QCD obtained using lattice calculations. I will discuss aspects of deconfinement related to fluctuations of conserved charges and screening of color charges in the deconfined medium using expectation value of Polyakov loop and Polyakov loop correlators.

Speaker: Peter Petreczky (BNL)

Paper proceedings_v3.pdf

Slides ismd15.pdf ismd15.ppt

09:25 Heavy quark masses from lattice QCD.

I will review progress in quark mass determinations from lattice QCD simulation, focusing on results for charm and bottom mass. These are of particular interest for precision Higgs studies. Recent determinations have achieved percent-level uncertainties with controlled systematics. Future prospects for these calculations will also be discussed.

Speaker: Dr Andrew Lytle (University of Glasgow)

Paper ISMD2015.pdf

Slides Lytle_ISMD2015.pdf

09:50 Recent results on hadron structure observables using lattice QCD simulations

We give an overview of recent results on hadron structure observables using lattice QCD simulations with physical values of the quark masses.

Speaker: Alexandrou Constantia (University of Cyprus and The Cyprus Institute)

Slides ISMD.pdf

10:15 Parton distribution functions and the structure of the proton: the CT14 QCD global analysis

An overview on the new parton distribution functions (PDFs) up to next-to-next-to-leading order (NNLO) from the CTEQ-TEA global analysis of quantum chromodynamics will be given. Predictions for important LHC processes, especially Higgs boson and top-quark pair production at 7, 8, 13 TeV, will be presented, and main features and impact of CT14 PDFs on LHC physics will be discussed.

Speaker: Dr Marco Guzzi (University of Manchester)

Conference proceedings conf-proc-guzzi.pdf

Slides guzzim-ISMD15.pdf

10:40 Coffee Break

Coffee Break

11:00 Theory status of jet physics

Speaker: Prof. Andre Hoang (Univ. of Vienna)

Slides Status_Jets_Hoang.pdf

11:25 Overview of QCD measurements at high pT

This talk gives an overview of QCD measurements at high pT at the LHC and other colliders. Recent results on inclusive jet, dijet and multijet production measurements are presented together with results of alpha_S extraction and constraints on the PDFs of the proton. Precision measurements of vector bosons (V = W, Z or γ) in association with jets allow for stringent tests of perturbative QCD. The measurements are compared to next-to leading order calculations and event simulations that devise matrix element calculations interfaced with parton showers.

Speaker: Matthias Weber (University of California Los Angeles (UCLA))

Slides 151008_Weber_QCD.pdf

11:50 Determination of alpha_s from the QCD static energy

We present the latest determination of the strong-coupling constant from the quantum chromodynamics static energy. It comes from comparing three-loop perturbative QCD with 2+1 unqueched lattice data and provides up to date one of the most accurate low-energy determinations of alpha_s.

Speaker: Antonio Vairo (TU Munich)

Paper ismd2015.pdf

Slides alphas15.pdf

12:15 The 2015 World Summary of alpha_s

A preliminary preview will be given on the recent update of alpha_s measurements and the new world average value of alpha_s(M_z), which is currently prepared for the 2015 edition of PDG's Review of Particle Properties.

Speaker: Prof. S. Bethke (Max Planck Institute für Physik)

Paper ISMD2015-alphas.pdf

Slides alphas-ISMD2015.pdf

12:30 → 14:00 Lunch break

14:00 → 17:35 Proton Structure from ep and pp

Convener: Prof. Ingo Schienbein (LPSC Grenoble)

14:00 Photon and photon+jet production measurements with the ATLAS detector

Isolated prompt photons provide a direct probe of short- distance physics, complementary to that provided by measurements of jets or vector-bosons and are sensitive to the gluon density of the proton. The inclusive prompt photon cross sections have been measured by the ATLAS collaboration at various centre-of-mass energies of pp collisions over a wide range of transverse momenta. These experimental results are reported in different fiducial regions covering a wide acceptance and are compared to next-to-leading order QCD calculations with different models of the parton content of the proton. The diphoton and photon+jet system cross sections have also been measured as a function of several kinematic variables.

Speaker: Prof. Claudia Glasman (Universidad Autonoma de Madrid)

Slides ismd2015_glasman.pdf

14:20 Combination of Measurements of Inclusive Deep Inelastic ep Scattering Cross Sections and QCD Analysis of HERA data

A combination is presented of all inclusive deep inelastic cross sections previously published by the H1 and ZEUS collaborations at HERA for neutral and charged current ep scattering for zero beam polarisation. The data correspond to an integrated luminosity of about 1 fb^-1 and span six orders of magnitude in negative four-momentum-transfer squared, Q2, and Bjorken x. The correlations of the systematic uncertainties were evaluated and taken into account for the combination. The combined cross sections were input to QCD analyses at LO, NLO and at NNLO, providing a new set of parton distribution functions, HERAPDF2.0. The analysis was extended by including HERA data on charm and jet production. The inclusion of jet-production cross sections made a simultaneous determination of these parton distributions and the strong coupling constant possible. An extraction of xF_3(gamma Z) and results on electroweak unification and scaling violations are also presented.

Speaker: Dr Iris Abt (MPI)

Paper abt_iris.pdf

Slides ISMD15-1.pdf

14:45 PDF constraints and alpha_s from CMS

Recent results on PDF constraints and alpha_s from CMS are presented

Speaker: Dr Maxime Gouzevitch (IPN, IN2P3-CNRS, UCB Lyon 1)

Slides ISMD_pdf_alphas_CMS.pdf

15:10 Studies of ATLAS measurements sensitive to the Proton Structure

Several measurements performed by the ATLAS collaboration are either useful to constrain the proton structure or are affected by its associated uncertainties. Measurements of the W+c production and the inclusive W and Z differential cross sections are found to constrain the poorly known strange-quark density at low x. Similarly, the ratio of W+/W- production is found to constrain the valence quarks at low x. Drell- Yan cross section measurements performed above and below the Z peak region have a different sensitivity to parton flavour, parton momentum fraction x and scale Q compared to measurements on the Z peak and can also be used to constrain the photon content of the proton. Measurements of the inclusive jet and photon cross sections are standard candles and can be useful to constrain the medium and high x gluon densities. Precision electroweak studies performed by ATLAS can be limited by the current knowledge on the proton structure. ...

Speaker: Dr Peter Bussey (Glasgow University)

Paper busseyismd.pdf

Slides Bussey_ISMD2015g.pdf

15:35 Coffee Break

16:05 HERAFitter project and its related studies

The uncertainties of protons parton distribution functions (PDFs) play a dominant role for the precision tests of the Standard Model (SM) and they also impact substantially the theory predictions of Beyond SM high mass production. We present theHERAFitter project which provides a unique open-source software framework for the determination of the proton's PDFs and for the interpretation of the physics analyses in the context of Quantum Chromodynamics (QCD). We report here the highlighted results based on the HERAFitter functionalities, as well as novel studies performed by HERAFitter. The latter includes the QCD analysis of the recent Drell-Yan production measurements at Tevatron. Reference of studies that the abstract covers are: [1] "HERAFitter Open Source QCD Fit Project", arXiv:1410.4412 [accepted by EPJC] [2] "QCD analysis of W- and Z-boson production at Tevatron", arXiv:1503.05221 [accepted by EPJC]

Speaker: Hayk Pirumov (DESY)

Slides pirumov_ismd2015_herafitter.pdf

16:25 Recent progress in PDF set combinations for the LHC

The current PDF4LHC recommendation to estimate uncertainties due to parton distribution functions (PDFs) in theoretical predictions for LHC processes involves the combination of separate predictions computed using PDF sets from different groups, each of which comprises a relatively large number of either Hessian eigenvectors or Monte Carlo (MC) replicas. We present a strategy for the statistical combination of individual PDF sets, followed by different reduction algorithms to end up with a small number of either Hessian eigenvectors or MC replicas. We illustrate our strategy with the combination of the recent NNPDF3.0, CT14 and MMHT14 NNLO PDF sets.

Speaker: Dr Andy Buckley (University of Glasgow)

Slides buckley-pdf4lhc.pdf

16:45 Combination of D* Differential Cross-Section Measurements in Deep-Inelastic ep Scattering at HERA

H1 and ZEUS have published single-differential cross sections for inclusive D* meson production in deep-inelastic ep scattering at HERA from their respective final data sets. These cross sections are combined in the common visible phase space region of photon virtuality Q^2 > 5 GeV^2, electron inelasticity 0.02 < y < 0.7 and the D* meson's transverse momentum p_T (D*)> 1.5 GeV and pseudorapidity |eta(D*)| < 1.5. The combination procedure takes into account all relevant correlations yielding significantly reduced experimental uncertainties. To extend the kinematic range down to Q2 > 1.5 GeV^2, double-differential cross sections are also combined with a subset of earlier D* data. Perturbative next-to-leading order QCD predictions are compared to the results.

Speaker: Achim Geiser (DESY Hamburg)

Slides ISMD15.pdf

17:05 Measurement of the Collins asymmetries for kaons and pions in e+e- annihilation at BABAR

Inclusive hadron production cross sections and angular distributions in e+e- collisions shed light on fundamental questions of hadronization and fragmentation processes. We present measurements of the Collins azimuthal asymmetries in inclusive production of hadron pairs, in the e+e- -> h1 h2 X annihilation process, where the hadrons (either kaons or pions) are produced in opposite hemispheres. The data collected by the BABAR detector allow the determination of the Collins fragmentation function as a function of hadron fractional energies and transverse momenta for the up, down and strange quarks. These data can be combined with semi-inclusive deep-inelastic-scattering data to extract the transversity distribution function, which is the least known leading-twist component of the QCD description of the partonic structure of the nucleon.

Speaker: Alessandra Filippi (INFN Torino)

Paper filippi_ISMD2015.pdf

Slides ismd2015_filippi.pdf

18:30 → 20:00 Dinner

19:00 → 21:00 BOE meeting

By invitation only. Dinner will be served for BOE members during the meeting.

Friday, 9 October

07:30 → 09:00 Breakfast

09:00 → 12:30 First Results from LHC Run II

Conveners: Dr Gabor Veres (CERN), Dr James Robinson (DESY)

09:00 First 13 TeV results from CMS (35'+5')

An overview of the first Run II results from CMS, including 13 TeV measurements of dN/deta of charged hadrons, the dijet ridge, inclusive ttbar and single top production among others.

Speaker: Dr Ferenc Siklér (Wigner RCP, Budapest)

Paper sikler_cms_ismd2015.pdf

Slides sikler_cms_13TeV.pdf

09:40 Early Run 2 Soft QCD Results from the ATLAS Collaboration (25'+5')

Since a few months the LHC has started to deliver pp collisions at the unprecedented centre-of-mass energy of 13 TeV. The ATLAS collaboration has analysed this very early Run 2 data taken in both special conditions with very low pileup and those dedicated to high pT physics. This talk is an overview of soft QCD Results at 13 TeV. The properties of minimum bias interactions as well as the "underlying event" accompanying hard scatters were studied using tracks. A reasonable agreement with models tuned to lower energy data is observed. A first measurement of the total inelastic pp cross section was performed.

Speaker: Hideyuki Oide (CERN)

Slides ATLAS_softQCD_ISMD2015_Oide.pdf

10:10 Early Run 2 Hard QCD Results from the ATLAS Collaboration (25'+5')

Since a few months the LHC has started to deliver pp collisions at the unprecedented centre-of-mass energy of 13 TeV. The ATLAS collaboration has analysed this very early Run 2 data taken in both special conditions with very low pileup and those dedicated to high pT physics. This talk is an overview of hard QCD Results at 13 TeV. The production of high pT jets, photons and diphotons were studied. The inclusive jet cross section is found to agree well with the prediction of perturbative QCD calculations performed at NLO accuracy. The production cross sections for W and Z bosons in their electron and muon decays was measured. In general agreement is found with the expectation of NNLO QCD calculations and interesting sensitivities to the proton structure functions are observed already at this stage. The top production cross section, measured in different top decay channels at 13 TeV, is compared to theoretical calculations.

Speaker: Mr Nicola Orlando (Aristotle University of Thessaloniki)

Paper ISMD2015_v2.pdf

Slides talk_v2.pdf

10:40 Coffee Break

11:10 First Run 2 results from ALICE (35'+5')

The ALICE Collaboration is collecting data with both Minimum Bias and Muon triggers with pp collisions at sqrt(s) = 13 TeV in the ongoing LHC Run II. An excellent performance of tracking and PID in the central barrel and in the muon spectrometer has been obtained. First results on the charged-particle pseudorapidity density and on identified particle transverse momentum spectra at 13 TeV will be presented.

Speaker: Dr Alberica Toia (Johann-Wolfgang-Goethe Univ., Frankfurt, Germany)

Paper AlbericaToiaISMD2015.pdf

Slides AlbericaToia_ISMD2015.pdf

11:50 First LHCb results from pp collisions at 13 TeV (35'+5')

By using the very first Run II LHC data LHCb measured the cross-sections for quarkonia, beauty and charm productions. Results exploits the new "Turbo" stream procedure allowing the analysis of particle candidates selected at trigger level without the need of offline reconstruction. First results are presented.

Speaker: Tomasz Szumlak (Cracow-AGH)

Slides ismd_ger_2015_TomaszSzumlak_v2.1.pdf

12:30 → 14:00 Lunch break

14:00 → 17:00 Departure

12:00 first bus to the airport leaves
14:00 second bus to the airport leaves