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Yuri KOULTCHITSKI (Head of Sector)05/10/2015, 09:15Multiparticle Correlations and FluctuationsOral PresentationMeasurements 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...Go to contribution page
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Mr Wei Yang Wang (National University of Singapore (NUS))05/10/2015, 09:32Multiparticle Correlations and FluctuationsOral PresentationThe 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...Go to contribution page
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Mr Sumit BASU (on behalf of the ALICE collaboration)05/10/2015, 09:49Multiparticle Correlations and FluctuationsOral PresentationEvent-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...Go to contribution page
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Mr ZHENGQIAO ZHANG (BNL)05/10/2015, 10:06Multiparticle Correlations and FluctuationsOral PresentationThe 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...Go to contribution page
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Prof. Miguel-Angel Sanchis-Lozano (IFIC, University of Valencia)05/10/2015, 10:22Multiparticle Correlations and FluctuationsOral PresentationMost 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.Go to contribution page
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Dr Wesley Metzger (Radboud University)05/10/2015, 11:08Multiparticle Correlations and FluctuationsOral PresentationSome new results concerning the tau-model of Bose-Einstein correlations will be presented.Go to contribution page
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andrzej bialas (Jagellonian University, Krakow)05/10/2015, 11:24Multiparticle Correlations and FluctuationsOral PresentationI 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...Go to contribution page
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Dr Sharka Todorova-Nova (Charles University, Prague)05/10/2015, 11:40Multiparticle Correlations and FluctuationsOral PresentationA 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.Go to contribution page
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Hans Eggers (Stellenbosch University)05/10/2015, 11:56Multiparticle Correlations and FluctuationsOral PresentationIn 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....Go to contribution page
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Mr Aditya Nath Mishra (IIT INdore), Dr Raghunath Sahoo (IIT Indore, India)05/10/2015, 12:12Multiparticle Correlations and FluctuationsOral PresentationUniversality 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...Go to contribution page
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Grzegorz Gach (AGH University of Science and Technology)05/10/2015, 14:00The 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...Go to contribution page
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Ms Christine Rasmussen (Lund University)05/10/2015, 14:20We 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...Go to contribution page
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Dr Gabor Veres (CERN)05/10/2015, 14:35Recent 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...Go to contribution page
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Prof. Tamas Csorgo (Wigner RCP Budapest and KRF Gyongyos)05/10/2015, 14:55The 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...Go to contribution page
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Prof. Errol (Asher) Gotsman (Tel Aviv University)05/10/2015, 15:15I 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: 1503.04294Go to contribution page
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Prof. Laszlo Jenkovszky (Bogolyubov ITP, Kiev)05/10/2015, 15:30It 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...Go to contribution page
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Prof. Antoni Szczurek (Institute of Nuclear Physics and Rzeszow University)05/10/2015, 16:15Diffraction and PomeronI 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...Go to contribution page
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Dr Wlodek Guryn (Brookhaven National Laboratory)05/10/2015, 16:30We 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...Go to contribution page
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Ms Maria Zurek (FZ Jülich)05/10/2015, 16:50Exclusive 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...Go to contribution page
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Dr Alice Valkarova (Institute of Particle and Nucelar Physics, Charles University)05/10/2015, 17:10The 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....Go to contribution page
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Prof. Boris Kopeliovich (UFTSM)05/10/2015, 17:30Production 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...Go to contribution page
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Prof. Viacheslav Kuvshinov (NAS)05/10/2015, 18:30V.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.Go to contribution page
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Dr Adam Kardos (University of Debrecen)05/10/2015, 18:35In 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...Go to contribution page
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Prof. Zack Sullivan (Illinois Institute of Technology)05/10/2015, 18:40We 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...Go to contribution page
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Mr Sumit BASU (Variable Energy Cyclotron Centre)05/10/2015, 18:45Non-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....Go to contribution page
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Mr Niccolo Moggi (University of Bologna)05/10/2015, 18:50The 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...Go to contribution page
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fabio anulli (INFN Sezione di Roma)05/10/2015, 18:55The 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...Go to contribution page
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Dr Andrii Verbytskyi (Max-Planck-Institut für Physik)05/10/2015, 19:00A 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. ...Go to contribution page
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Prof. Dick Greenwood (ATLAS)05/10/2015, 19:05We 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...Go to contribution page
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Prof. Dick Greenwood (ATLAS)05/10/2015, 19:10We 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...Go to contribution page
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Dr Mikhail Barabanov (JINR)05/10/2015, 19:15The 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...Go to contribution page
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Mr Wei Yang Wang (National University of Singapore (NUS))05/10/2015, 19:20A 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....Go to contribution page
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Mr Qixiang Leong (National University of Singapore)05/10/2015, 19:25A 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.Go to contribution page
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Prof. Georg Wolschin (Institut für Theoretische Physik)05/10/2015, 19:30The 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...Go to contribution page
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Mr Michal Krelina (FNSPE, Czech Technical University in Prague)05/10/2015, 19:35We 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...Go to contribution page
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Dr Victor Goncalves (Lund University/Sweden and UFPel/Brazil)05/10/2015, 19:40Using 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...Go to contribution page
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Dr Alexander Bylinkin (MIPT)05/10/2015, 19:45The 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...Go to contribution page
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Dr Amaresh Jaiswal (GSI Helmholtzzentrum für Schwerionenforschung)05/10/2015, 19:50Collective Phenomena in High Energy CollisionsStarting 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...Go to contribution page
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Mr Sumit BASU (Variable Energy Cyclotron Centre)05/10/2015, 19:55Temperature 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...Go to contribution page
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Dr Henso Abreu (Israel Institute of Technology (IL))06/10/2015, 10:30Searches 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...Go to contribution page
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Prof. Mario Bertaina (University of Torino and INFN Torino)06/10/2015, 10:50Cosmic 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...Go to contribution page
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Ralf Ulrich (KIT)06/10/2015, 11:15Many 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...Go to contribution page
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Dr Sergey Ostapchenko (Frankfurt Institute for Advanced Studies (FIAS))06/10/2015, 11:40I 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...Go to contribution page
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Dr Darko Veberic (Institute for Nuclear Physics, Karlsruhe Institute of Technology)06/10/2015, 12:35The 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...Go to contribution page
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Dr Rasha Abbasi (University of Utah)06/10/2015, 12:55Detecting 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...Go to contribution page
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Prof. Elisa Resconi (TU Munchen)06/10/2015, 13:15The 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....Go to contribution page
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Dr Gwenael Giacinti (MPIK, Heidelberg)06/10/2015, 13:35IceCube 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...Go to contribution page
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Stefan Gieseke (KIT), Dr Stefan Kluth (MPI für Physik)06/10/2015, 14:00A 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...Go to contribution page
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Marek Schoenherr (University of Zurich)06/10/2015, 14:20With 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.Go to contribution page
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Prof. Enrico Tassi (Universita' della Calabria and INFN-Cosenza)06/10/2015, 14:45In 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...Go to contribution page
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Sascha Caron (Nikhef and Radboud University Nijmegen)06/10/2015, 15:10Despite 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...Go to contribution page
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Mr Vieri Candelise (Univ. di Trieste e Sez. dell'INFN, Italy)06/10/2015, 16:30The 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...Go to contribution page
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Ms Heather McAslan (University of Sussex)06/10/2015, 16:55This 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...Go to contribution page
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Mr Nuno Anjos (IFAE (Barcelona))06/10/2015, 17:20Several 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...Go to contribution page
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Dr Hayk Pirumov (DESY)06/10/2015, 17:45Signals 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...Go to contribution page
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Dr Amaresh Jaiswal (GSI Helmholtzzentrum für Schwerionenforschung)07/10/2015, 09:00Collective Phenomena in High Energy CollisionsOral PresentationUsing 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...Go to contribution page
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Dr Rafael Derradi de Souza (State University of Campinas - Brazil)07/10/2015, 09:20Collective Phenomena in High Energy CollisionsOral PresentationThe 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...Go to contribution page
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Mr Emil Kaptur (University of Silesia)07/10/2015, 09:40Collective Phenomena in High Energy CollisionsOral PresentationThe 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...Go to contribution page
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Prof. Byungsik Hong (Korea University)07/10/2015, 10:00Collective Phenomena in High Energy CollisionsOral PresentationQuarkonium 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...Go to contribution page
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Wojciech Florkowski (Institute of Nuclear Physics)07/10/2015, 10:20Collective Phenomena in High Energy CollisionsOral PresentationFor 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...Go to contribution page
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Zhenyu Chen (CMS)07/10/2015, 11:10Collective Phenomena in High Energy CollisionsOral PresentationNew 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....Go to contribution page
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Laure Marie Massacrier (Orsay-LAL)07/10/2015, 11:30Collective Phenomena in High Energy CollisionsOral PresentationProton-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...Go to contribution page
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Prof. L Gutay (Purdue University)07/10/2015, 11:50Collective Phenomena in High Energy CollisionsOral PresentationIt 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...Go to contribution page
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Prof. Thomas Trainor (University of Washington)07/10/2015, 12:10Collective Phenomena in High Energy CollisionsOral PresentationRecent 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...Go to contribution page
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Peter Petreczky (BNL)08/10/2015, 09:00I 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.Go to contribution page
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Dr Andrew Lytle (University of Glasgow)08/10/2015, 09:25I 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.Go to contribution page
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Alexandrou Constantia (University of Cyprus and The Cyprus Institute)08/10/2015, 09:50We give an overview of recent results on hadron structure observables using lattice QCD simulations with physical values of the quark masses.Go to contribution page
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Dr Marco Guzzi (University of Manchester)08/10/2015, 10:15An 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.Go to contribution page
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Prof. Andre Hoang (Univ. of Vienna)08/10/2015, 11:00
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Matthias Weber (University of California Los Angeles (UCLA))08/10/2015, 11:25This 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....Go to contribution page
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Antonio Vairo (TU Munich)08/10/2015, 11:50We 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.Go to contribution page
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Prof. S. Bethke (Max Planck Institute für Physik)08/10/2015, 12:15A 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.Go to contribution page
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Prof. Claudia Glasman (Universidad Autonoma de Madrid)08/10/2015, 14:00Isolated 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...Go to contribution page
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Dr Iris Abt (MPI)08/10/2015, 14:20A 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...Go to contribution page
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Dr Maxime Gouzevitch (IPN, IN2P3-CNRS, UCB Lyon 1)08/10/2015, 14:45Recent results on PDF constraints and alpha_s from CMS are presentedGo to contribution page
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Dr Peter Bussey (Glasgow University)08/10/2015, 15:10Several 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...Go to contribution page
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Hayk Pirumov (DESY)08/10/2015, 16:05The 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...Go to contribution page
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Dr Andy Buckley (University of Glasgow)08/10/2015, 16:25The 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...Go to contribution page
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1. Combination of D* Differential Cross-Section Measurements in Deep-Inelastic ep Scattering at HERAAchim Geiser (DESY Hamburg)08/10/2015, 16:45H1 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...Go to contribution page
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Alessandra Filippi (INFN Torino)08/10/2015, 17:05Inclusive 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...Go to contribution page
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Dr Ferenc Siklér (Wigner RCP, Budapest)09/10/2015, 09:00An 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.Go to contribution page
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Hideyuki Oide (CERN)09/10/2015, 09:40Since 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...Go to contribution page
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Mr Nicola Orlando (Aristotle University of Thessaloniki)09/10/2015, 10:10Since 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...Go to contribution page
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Dr Alberica Toia (Johann-Wolfgang-Goethe Univ., Frankfurt, Germany)09/10/2015, 11:10The 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...Go to contribution page
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Tomasz Szumlak (Cracow-AGH)09/10/2015, 11:50By 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.Go to contribution page
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Mr Kishora Nayak (NISER, Bhubaneswar)Collective Phenomena in High Energy CollisionsPosterHadronic 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,...Go to contribution page
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Dr Julian Book (Goethe University Frankfurt)Collective Phenomena in High Energy CollisionsPosterThe 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...Go to contribution page
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Prof. Dick Greenwood (ATLAS)High Energy and High Pt InteractionsPosterJets 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...Go to contribution page
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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 FluctuationsOral PresentationThe 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...Go to contribution page
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Prof. Antoni Szczurek (Institute of Nuclear Physics and Rzeszow University)Diffraction and PomeronOral PresentationI 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...Go to contribution page
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Prof. Dick Greenwood (ATLAS)Collective Phenomena in High Energy CollisionsOral PresentationMeasurements 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...Go to contribution page
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Dr Elena Kokoulina (JINR)Collective Phenomena in High Energy CollisionsPosterFirst 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...Go to contribution page
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Dr Ladislav Sandor (Institute of exp. physics, Slovak acad, sci.)Collective Phenomena in High Energy CollisionsPosterThe 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...Go to contribution page
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fabio anulli (INFN Sezione di Roma)High Energy and High Pt InteractionsPosterWe 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...Go to contribution page
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Dr Zebo Tang (University of Science and Technology of China)Collective Phenomena in High Energy CollisionsPosterThe 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...Go to contribution page
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Prof. Siggi Bethke (MPI Munich)
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