Yuri KOULTCHITSKI
(Head of Sector)
10/5/15, 9:15 AM
Multiparticle Correlations and Fluctuations
Oral Presentation
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...
Mr
Wei Yang Wang
(National University of Singapore (NUS))
10/5/15, 9:32 AM
Multiparticle Correlations and Fluctuations
Oral Presentation
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...
Mr
Sumit BASU
(on behalf of the ALICE collaboration)
10/5/15, 9:49 AM
Multiparticle Correlations and Fluctuations
Oral Presentation
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...
Mr
ZHENGQIAO ZHANG
(BNL)
10/5/15, 10:06 AM
Multiparticle Correlations and Fluctuations
Oral Presentation
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...
Prof.
Miguel-Angel Sanchis-Lozano
(IFIC, University of Valencia)
10/5/15, 10:22 AM
Multiparticle Correlations and Fluctuations
Oral Presentation
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.
Dr
Wesley Metzger
(Radboud University)
10/5/15, 11:08 AM
Multiparticle Correlations and Fluctuations
Oral Presentation
Some new results concerning the tau-model of Bose-Einstein correlations will be presented.
andrzej bialas
(Jagellonian University, Krakow)
10/5/15, 11:24 AM
Multiparticle Correlations and Fluctuations
Oral Presentation
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...
Dr
Sharka Todorova-Nova
(Charles University, Prague)
10/5/15, 11:40 AM
Multiparticle Correlations and Fluctuations
Oral Presentation
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.
Hans Eggers
(Stellenbosch University)
10/5/15, 11:56 AM
Multiparticle Correlations and Fluctuations
Oral Presentation
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....
Mr
Aditya Nath Mishra
(IIT INdore), Dr
Raghunath Sahoo
(IIT Indore, India)
10/5/15, 12:12 PM
Multiparticle Correlations and Fluctuations
Oral Presentation
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...
Grzegorz Gach
(AGH University of Science and Technology)
10/5/15, 2:00 PM
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...
Ms
Christine Rasmussen
(Lund University)
10/5/15, 2:20 PM
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...
Prof.
Tamas Csorgo
(Wigner RCP Budapest and KRF Gyongyos)
10/5/15, 2:55 PM
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...
Prof.
Errol (Asher) Gotsman
(Tel Aviv University)
10/5/15, 3:15 PM
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
Prof.
Laszlo Jenkovszky
(Bogolyubov ITP, Kiev)
10/5/15, 3:30 PM
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...
Prof.
Antoni Szczurek
(Institute of Nuclear Physics and Rzeszow University)
10/5/15, 4:15 PM
Diffraction and Pomeron
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...
Dr
Wlodek Guryn
(Brookhaven National Laboratory)
10/5/15, 4:30 PM
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...
Ms
Maria Zurek
(FZ Jülich)
10/5/15, 4:50 PM
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...
Dr
Alice Valkarova
(Institute of Particle and Nucelar Physics, Charles University)
10/5/15, 5:10 PM
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....
Prof.
Boris Kopeliovich
(UFTSM)
10/5/15, 5:30 PM
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...
Prof.
Viacheslav Kuvshinov
(NAS)
10/5/15, 6:30 PM
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.
Dr
Adam Kardos
(University of Debrecen)
10/5/15, 6:35 PM
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...
Prof.
Zack Sullivan
(Illinois Institute of Technology)
10/5/15, 6:40 PM
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...
Mr
Sumit BASU
(Variable Energy Cyclotron Centre)
10/5/15, 6:45 PM
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....
Mr
Niccolo Moggi
(University of Bologna)
10/5/15, 6:50 PM
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...
fabio anulli
(INFN Sezione di Roma)
10/5/15, 6:55 PM
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...
Dr
Andrii Verbytskyi
(Max-Planck-Institut für Physik)
10/5/15, 7:00 PM
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. ...
Prof.
Dick Greenwood
(ATLAS)
10/5/15, 7:05 PM
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...
Prof.
Dick Greenwood
(ATLAS)
10/5/15, 7:10 PM
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...
Dr
Mikhail Barabanov
(JINR)
10/5/15, 7:15 PM
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...
Mr
Wei Yang Wang
(National University of Singapore (NUS))
10/5/15, 7:20 PM
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....
Mr
Qixiang Leong
(National University of Singapore)
10/5/15, 7:25 PM
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.
Prof.
Georg Wolschin
(Institut für Theoretische Physik)
10/5/15, 7:30 PM
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...
Mr
Michal Krelina
(FNSPE, Czech Technical University in Prague)
10/5/15, 7:35 PM
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...
Dr
Victor Goncalves
(Lund University/Sweden and UFPel/Brazil)
10/5/15, 7:40 PM
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...
Dr
Alexander Bylinkin
(MIPT)
10/5/15, 7:45 PM
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...
Dr
Amaresh Jaiswal
(GSI Helmholtzzentrum für Schwerionenforschung)
10/5/15, 7:50 PM
Collective Phenomena in High Energy Collisions
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...
Mr
Sumit BASU
(Variable Energy Cyclotron Centre)
10/5/15, 7:55 PM
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...
Dr
Henso Abreu
(Israel Institute of Technology (IL))
10/6/15, 10:30 AM
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...
Prof.
Mario Bertaina
(University of Torino and INFN Torino)
10/6/15, 10:50 AM
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...
Dr
Sergey Ostapchenko
(Frankfurt Institute for Advanced Studies (FIAS))
10/6/15, 11:40 AM
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...
Dr
Darko Veberic
(Institute for Nuclear Physics, Karlsruhe Institute of Technology)
10/6/15, 12:35 PM
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...
Dr
Rasha Abbasi
(University of Utah)
10/6/15, 12:55 PM
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...
Prof.
Elisa Resconi
(TU Munchen)
10/6/15, 1:15 PM
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....
Dr
Gwenael Giacinti
(MPIK, Heidelberg)
10/6/15, 1:35 PM
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...
Stefan Gieseke
(KIT), Dr
Stefan Kluth
(MPI für Physik)
10/6/15, 2:00 PM
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...
Marek Schoenherr
(University of Zurich)
10/6/15, 2:20 PM
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.
Prof.
Enrico Tassi
(Universita' della Calabria and INFN-Cosenza)
10/6/15, 2:45 PM
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...
Sascha Caron
(Nikhef and Radboud University Nijmegen)
10/6/15, 3:10 PM
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...
Mr
Vieri Candelise
(Univ. di Trieste e Sez. dell'INFN, Italy)
10/6/15, 4:30 PM
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...
Ms
Heather McAslan
(University of Sussex)
10/6/15, 4:55 PM
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...
Mr
Nuno Anjos
(IFAE (Barcelona))
10/6/15, 5:20 PM
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...
Dr
Amaresh Jaiswal
(GSI Helmholtzzentrum für Schwerionenforschung)
10/7/15, 9:00 AM
Collective Phenomena in High Energy Collisions
Oral Presentation
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...
Dr
Rafael Derradi de Souza
(State University of Campinas - Brazil)
10/7/15, 9:20 AM
Collective Phenomena in High Energy Collisions
Oral Presentation
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...
Mr
Emil Kaptur
(University of Silesia)
10/7/15, 9:40 AM
Collective Phenomena in High Energy Collisions
Oral Presentation
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...
Prof.
Byungsik Hong
(Korea University)
10/7/15, 10:00 AM
Collective Phenomena in High Energy Collisions
Oral Presentation
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...
Wojciech Florkowski
(Institute of Nuclear Physics)
10/7/15, 10:20 AM
Collective Phenomena in High Energy Collisions
Oral Presentation
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...
Zhenyu Chen
(CMS)
10/7/15, 11:10 AM
Collective Phenomena in High Energy Collisions
Oral Presentation
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....
Laure Marie Massacrier
(Orsay-LAL)
10/7/15, 11:30 AM
Collective Phenomena in High Energy Collisions
Oral Presentation
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...
Prof.
L Gutay
(Purdue University)
10/7/15, 11:50 AM
Collective Phenomena in High Energy Collisions
Oral Presentation
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...
Prof.
Thomas Trainor
(University of Washington)
10/7/15, 12:10 PM
Collective Phenomena in High Energy Collisions
Oral Presentation
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...
Dr
Andrew Lytle
(University of Glasgow)
10/8/15, 9:25 AM
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.
Alexandrou Constantia
(University of Cyprus and The Cyprus Institute)
10/8/15, 9:50 AM
We give an overview of recent results on hadron structure observables using lattice QCD simulations with physical values of the quark masses.
Dr
Marco Guzzi
(University of Manchester)
10/8/15, 10:15 AM
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.
Prof.
Andre Hoang
(Univ. of Vienna)
10/8/15, 11:00 AM
Matthias Weber
(University of California Los Angeles (UCLA))
10/8/15, 11:25 AM
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....
Antonio Vairo
(TU Munich)
10/8/15, 11:50 AM
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.
Prof.
S. Bethke
(Max Planck Institute für Physik)
10/8/15, 12:15 PM
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.
Prof.
Claudia Glasman
(Universidad Autonoma de Madrid)
10/8/15, 2:00 PM
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...
Dr
Maxime Gouzevitch
(IPN, IN2P3-CNRS, UCB Lyon 1)
10/8/15, 2:45 PM
Recent results on PDF constraints and alpha_s from CMS are presented
Dr
Peter Bussey
(Glasgow University)
10/8/15, 3:10 PM
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...
Dr
Andy Buckley
(University of Glasgow)
10/8/15, 4:25 PM
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...
1.
Combination of D* Differential Cross-Section Measurements in Deep-Inelastic ep Scattering at HERA
Achim Geiser
(DESY Hamburg)
10/8/15, 4:45 PM
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...
Alessandra Filippi
(INFN Torino)
10/8/15, 5:05 PM
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...
Dr
Ferenc Siklér
(Wigner RCP, Budapest)
10/9/15, 9:00 AM
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.
Mr
Nicola Orlando
(Aristotle University of Thessaloniki)
10/9/15, 10:10 AM
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...
Dr
Alberica Toia
(Johann-Wolfgang-Goethe Univ., Frankfurt, Germany)
10/9/15, 11:10 AM
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...
Tomasz Szumlak
(Cracow-AGH)
10/9/15, 11:50 AM
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.
Mr
Kishora Nayak
(NISER, Bhubaneswar)
Collective Phenomena in High Energy Collisions
Poster
Hadronic resonances are used to study the properties of the strongly interacting hot and dense matter produced in ultra-relativistic heavy-ion collisions. The medium produced in such collisions evolves through different stages, including an early partonic phase which is succeeded by a hadronic phase. Since resonance yields may be modified by rescattering and regeneration after hadronization,...
Dr
Julian Book
(Goethe University Frankfurt)
Collective Phenomena in High Energy Collisions
Poster
The ALICE Experiment at the Large Hadron Collider (LHC) provides excellent capabilities to study charmonium production at low transverse momentum ($p_\mathrm{T}$). At central ($|y|<0.9$) and forward rapidity ($2.5<y<4$), J$/\psi$ are reconstructed via their leptonic decay channels down to $p_\mathrm{T}$ = 0. We will present ALICE results on the inclusive J$/\psi$ nuclear modification factor...
Prof.
Dick Greenwood
(ATLAS)
High Energy and High Pt Interactions
Poster
Jets provide a powerful tool for probing the dynamics of the quark-gluon plasma created in Pb+Pb collisions at the LHC. The modification of high-pT jets as they propagate in the quark-gluon plasma provides insight on structure of the plasma at short-length scale. Such modifications have been observed in a variety of measurements of single jet, dijet, photon-jet and charged-particle...
Prof.
Gideon Alexander
(School of Physics and Astronomy, Raymond and Beverly Sackler Faculty of Exact Science, Tel-Aviv University), Prof.
Vitalii Okorokov
(National Research Nuclear University "MEPhI" (Moscow Engineering Physics Institute))
Multiparticle Correlations and Fluctuations
Oral Presentation
The energy dependence of the strength parameter also called the chaoticity, derived from Bose-Einstein correlations (BEC) of pion-pairs produced in proton-proton collisions is investigated. Considered are the one and three dimensions (1D, 3D) of the BEC analyzed in terms of a Gaussian and / or exponential distributions. A marked difference is observed between the dependence of the chaoticity...
Prof.
Antoni Szczurek
(Institute of Nuclear Physics and Rzeszow University)
Diffraction and Pomeron
Oral Presentation
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...
Prof.
Dick Greenwood
(ATLAS)
Collective Phenomena in High Energy Collisions
Oral Presentation
Measurements of soft particle production have provided valuable insight on properties of the evolution of the quark-gluon plasma in Pb+Pb collisions at the LHC. In particular, measurements of flow harmonics using the azimuthal angle distributions of low-pT particles directly test hydrodynamic model descriptions of its evolution. The large acceptance of the ATLAS detector enables the...
Dr
Elena Kokoulina
(JINR)
Collective Phenomena in High Energy Collisions
Poster
First results of soft photon study in nuclear interactions at 3.5 GeV per nucleon are presented. These photons have been registered at Nuclotron (LHEP, JINR) by an electromagnetic calorimeter built of SVD Collaboration. The obtained spectra confirm the excess yield in the energy region less than 50 MeV in comparison with theoretical predictions and agree with previous experiments at...
Dr
Ladislav Sandor
(Institute of exp. physics, Slovak acad, sci.)
Collective Phenomena in High Energy Collisions
Poster
The study of strange and multi-strange particle production in high-energy collisions of heavy nuclei is considered as as unique tool to investigate the properties of the hot and dense matter created in the course of collision. These processes are sensitive to the reaction dynamics, as there is no net strangeness content in the initial state of colliding nuclei. In particular, an enhanced...
fabio anulli
(INFN Sezione di Roma)
High Energy and High Pt Interactions
Poster
We report on recent searches for baryonic B decays using the whole BABAR dataset of 471 million B anti-B pairs. Although about 7% of all B decays have baryons in the final state, known exclusive decay modes account for only about 10% of these decays, and very little is known about the mechanism of baryon production in weak decays or in the hadronization process. By studing such decays we...
Dr
Zebo Tang
(University of Science and Technology of China)
Collective Phenomena in High Energy Collisions
Poster
The hydro-dynamics inspired thermal approach - Blast-Wave (BW) model - implemented with non-extensive Tsallis statistics (TBW) has gained increasing interest in heavy-ion physics. With the come out of recent LHC results on particle production of various species, it is a good opportunity to use this approach to interpret the data. The pT spectra, from both p+p and Pb+Pb collisions, are...
