Description
Poster session with pretzels, beer, wine, and soft drinks
Mahmut Ozdemir
(Johann-Wolfgang-Goethe Univ. (DE))
20/05/2014, 16:30
Thermodynamics and Hadron Chemistry
Poster
Low-mass dielectrons are an important experimental tool to investigate the properties of the hot and dense medium created in ultrarelativistic heavy-ion collisions. Electrons do not interact strongly, therefore they provide information from all stages of the collision. In particular, a possible restoration of chiral symmetry in the hot and dense medium can be probed with dielectron decays of...
Ajay Kumar Dash
(Universidade Estadual de Campinas (BR))
20/05/2014, 16:30
Initial State Physics
Poster
Particle production in p-Pb collisions, in contrast to pp, is expected
to be sensitive to nuclear effects in the initial state. The role of
the initial and final state effects can be understood from the measurement
of identified particle spectra. One of the key observables to
characterize the hot and dense matter produced in high-energy
collisions is strangeness production. Here we will...
Sarah Campbell
(Iowa State University)
20/05/2014, 16:30
Jets
Poster
Cu+Au collisions at RHIC generate asymmetric initial geometries and densities in both azimuth and rapidity. High $p_T$ $\pi^0$s produced in $\sqrt{s_{NN}}$ = 200 GeV Cu+Au collisions provide new environments to study parton energy loss in the Quark Gluon Plasma. including very central events where the Cu nucleus is enveloped by the Au nucleus. By measuring $\pi^0$ yields in $\phi$ relative...
Marco Leoncino
(University of Turin and INFN (IT))
20/05/2014, 16:30
Open Heavy Flavour and Quarkonia
Poster
Quarkonium states are important probes to investigate the properties of strongly interacting matter created in ultrarelativistic heavy-ion collisions and to confirm the presence of Quark-Gluon Plasma (QGP). A significant contribution to the observed suppression can also come from cold nuclear matter effects, which can be studied in proton-nucleus collisions. The $\psi(2{\rm S})$ production is...
Francesco Bossu
(iThemba Lab. for Accel. Based Sci. (ZA))
20/05/2014, 16:30
Electromagnetic Probes
Poster
At the LHC, electroweak boson production measurements in p-Pb and Pb-Pb collisions are possible thanks to the availability of higher centre of mass energies as well as higher luminosities with respect to other ion accelerator facilities.
From a theoretical point of view, electroweak boson production can be considered to be well understood. $\rm Z^{0}$ and $\rm W^{\pm}$ bosons are produced...
Alexander Borissov
(Pusan National University (KR))
20/05/2014, 16:30
Thermodynamics and Hadron Chemistry
Poster
Hyperon production in heavy-ion collisions is a very precious probe to study the properties of the hot dense matter, as it is sensitive to strangeness enhancement, chiral symmetry restoration and parton energy loss. Moreover, it allows to further constrain the chemical freeze-out parameters based on statistical models. The measurement of the full set of hyperons allows to discriminate prompt...
Michael Tannenbaum
(Brookhaven National Laboratory (US))
20/05/2014, 16:30
Initial State Physics
Poster
Measurements of mid-rapidity $dE_T/d\eta$ distributions in p+p, d+Au and Au+Au at $\sqrt{s_{NN}}=200$ GeV by PHENIX at RHIC are presented and analyzed in terms of the number of Constituent-Quark participants, $N_{\rm qp}$. This provides a physical way to introduce fluctuations in Glauber Model calculations of p+p collisions, since the spatial distribution of each of the three constituent...
Songkyo Lee
(Korea University (KR))
20/05/2014, 16:30
Open Heavy Flavour and Quarkonia
Poster
Charmonia in nucleus-nucleus (A-A) collisions are an important probe to study for understanding the deconfinement in heavy ion collisions at LHC energies. The measurement in proton-lead (p-A) collisions of prompt and non-prompt $J/\psi$ production enables us to investigate nuclear matter effects and therefore, provides a new input to examine the hot-medium effects in A-A collisions, which are...
Ota Kukral
(Czech Technical University, Prague)
20/05/2014, 16:30
Open Heavy Flavour and Quarkonia
Poster
Suppression of quarkonia production in high energy nuclear collisions relative to proton-proton collisions, due to color screening of the quark-antiquark potential, has been predicted to be a sensitive indicator of the temperature of the created QGP. However, initial state cold nuclear matter effects, production via recombination of quark-antiquark pairs in the QGP and dissociation in hadronic...
Kishora Nayak
(National Institute of Science Education and Research (IN))
20/05/2014, 16:30
QCD at High Temperature and/or Density
Poster
Short lived resonances are good probes to study the properties of strongly interacting matter produced in high energy heavy ion collisions. In particular, the resonance ${\rm K^{\ast 0}}$ is important because of its very short lifetime which is comparable to that of the fireball. The decay daughters are expected to undergo re-scattering and re-generation processes, which could modify the...
Andrea Festanti
(Universita e INFN (IT))
20/05/2014, 16:30
Open Heavy Flavour and Quarkonia
Poster
The study of D mesons in proton-nucleus collisions provides insight into the role of cold nuclear matter effects in charm production, such as the modification of parton densities in nuclei and initial-state multiple partonic scattering. The observed modification of the D-meson transverse momentum distributions in central Pb-Pb with respect to pp collisions has been confirmed as due to hot...
Ankita Sharma
(University of Jammu (IN))
20/05/2014, 16:30
Open Heavy Flavour and Quarkonia
Poster
Heavy quarks (charm and beauty) are a powerful probe to investigate the properties of the medium created in heavy-ion collisions. Due to their large mass, heavy quarks are produced as a result of partonic scattering processes with large momentum transfer, occurring in the early stages of the collisions. The produced heavy quarks travel through the medium, experiencing all the stages of its...
Brooke Haag
(UC Davis)
20/05/2014, 16:30
Future Experimental Facilities, Upgrades, and Instrumentation
Poster
The RHIC Beam Energy Scan (BES) was proposed to search for the possible critical point and to study the nature of the phase transition between hadronic and partonic matter. Data from the NA49 experiment at CERN had suggested the onset of deconfinement at a collision energy of 7.7 GeV [1]. Though RHIC has not demonstrated sufficient luminosity to access collisions below 7.7 GeV in...
Anand Kumar Dubey
(Department of Atomic Energy (IN))
20/05/2014, 16:30
Future Experimental Facilities, Upgrades, and Instrumentation
Poster
A Muon detection system is under development for the CBM experiment at the upcoming FAIR facility at GSI. By measuring muon pairs from the decay of low-mass vector mesons and charmonium, the Muon Chamber system (MUCH) will substantially contribute to the exploration of the QCD phase diagram at large baryon chemical potentials. The research program includes the search for de-confinement and...
Razieh Morad
(University of Cape Town)
20/05/2014, 16:30
New Theoretical Developments
Poster
Unlike heavy quarks, light quark energy loss in AdS/CFT is surprisingly dependent on both the string initial conditions and the very definition of the jet itself in the gravity theory. In order to more accurately model QCD jet energy loss in AdS/CFT, we more closely match the string initial conditions to those expected from pQCD and simultaneously propose a novel jet prescription in the dual...
Dr
Ming Liu
(Los Alamos National Laboratory)
20/05/2014, 16:30
Initial State Physics
Poster
Jet quenching in heavy ion collisions is considered to be one of the important tools to study the QGP properties at RHIC and LHC. However, at present there are several competing models to describe the jet energy loss processes in heavy ion collisions, and current heavy ion data cannot clearly discriminate between them, thus the interpretation of QGP data is very model dependent. High energy...
Rainer Fries
(Texas A&M University)
20/05/2014, 16:30
Initial State Physics
Poster
We present an analytic calculation of the initial classical gluon field in high energy collisions of nuclei. Our results are explicit expressions for the components of the event-averaged energy momentum tensor which are valid up yo times $\tau\sim1/Q_s$. In particular we will discuss the early time evolution of the energy density and longitudinal and transverse pressure, and compare to...
David Morrison
(BNL)
20/05/2014, 16:30
Future Experimental Facilities, Upgrades, and Instrumentation
Poster
As a particular realization of an electron ion collider (EIC), the
eRHIC project envisions the addition of a high intensity polarized
electron beam to the existing RHIC facility, providing $e$$+$$p$ and
$e$$+$A collisions and enabling precision studies of the partonic
structure of hadronic matter. To fully exploit the physics potential
of eRHIC, the PHENIX Collaboration is proposing a...
Per-Ivar Lonne
(University of Bergen (NO))
20/05/2014, 16:30
Open Heavy Flavour and Quarkonia
Poster
In collisions of lead nuclei at the Large Hadron Collider (LHC) at CERN, a state of matter called Quark-Gluon Plasma (QGP) is predicted to be formed, where quarks and gluons are no longer confined into hadrons. Heavy-flavour quarks, i.e., charm and beauty, are effective probes for studying the QGP, as their relatively large mass limits their production predominantly, if not exclusively, to...
Salvatore Plumari
(University of Catania (Italy)),
Vincenzo Greco
(University of Catania)
20/05/2014, 16:30
Collective Dynamics
Poster
We discuss the build up of elliptic flow and high order harmonics $v_n$ within a transport
approach at fixed shear viscosity to entropy density ratio and with initial state fluctuations.
We show, exploring the $T$ dependence of $\eta/s$, that a study of $v_n$ in a wide $p_T$ range
allows to understand the difference behind the collective flows at LHC respect to RHIC. Furthermore
we...
Prof.
Alexandru Jipa
(Atomic and Nuclear Physics Chair, Faculty of Physics, University of Bucharest, Romania)
20/05/2014, 16:30
Collective Dynamics
Poster
Recently, we proposed a C# code, namely Chaos Many-Body Engine [1,2], for chaos analysis of relativistic many-body systems with reactions. Preliminary tests using a simplified relativistic nuclear collisions model resulted in some encouraging results for describing global physical quantities obtained in C-C collisions at 4.5 A GeV/c in experiments performed at JINR Synchrophasotron (SKM 200...
Kirill Boguslavski
(Heidelberg University)
20/05/2014, 16:30
Approach to Equilibrium
Poster
We show simulation results for longitudinally expanding gauge and scalar field theories as they approach thermal equilibrium. Most remarkably, we find a common nonthermal attractor solution in a characteristic momentum regime. As a consequence, important aspects of the evolution towards equilibrium turn out to be insensitive to the details of the underlying theory.
Jorge Noronha
(University of Sao Paulo)
20/05/2014, 16:30
Initial State Physics
Poster
Large azimuthal quadrupole and octupole asymmetries have recently been found in p+Pb collisions at the LHC. We argue that these might arise from a projectile dipole scattering off randomly shaped intrinsic fluctuations in the target with a size on the order of the dipole. Generic energy-momentum fluctuations generate comparable asymmetries for all multipole moments vn. The holographic...
Dr
Koichi Hattori
(RIKEN)
20/05/2014, 16:30
Electromagnetic Probes
Poster
It has been known for a long time that neutral-pions dominantly decay into two photons,
which was subsequently understood on a robust theoretical basis after the discovery of chiral anomaly.
A theorem shown in a seminal paper by Adler and Bardeen [1] indicates
that a neutral pion is coupled to only two-photon states without couplings to other multi-photon states.
When chiral anomaly is...
John Campbell
(The Ohio State University)
20/05/2014, 16:30
Correlations and Fluctuations
Poster
Collisions between uranium nuclei have been produced in the Relativistic Heavy Ion Collider and measured in the STAR detector. Due to the prolate deformation of the nuclei, fully overlapping U+U collisions offer the opportunity to produce highly anisotropic participant zones, similar in shape to mid-central Au+Au collisions, but with twice the size. The larger fireball should be characterized...
Sandun Pahula Hewage
(University of Houston (US))
20/05/2014, 16:30
Jets
Poster
Two-particle azimuthal correlations are an ideal tool to study high $p_{\rm T}$ parton fragmentation without full jet reconstruction. Enhancements of the azimuthal correlations are seen at $\Delta \varphi = 0$ and $\Delta \varphi = \pi$, corresponding to the near-side and away-side jets, respectively. We present correlations between charged leading particle and associated strange baryons...
Dr
Aihong Tang
(Brookhaven National Laboratory)
20/05/2014, 16:30
Correlations and Fluctuations
Poster
Negative binomial distribution has been widely used in describing the multiplicity distribution in high energy collisions. The parameters of a negative binomial distribution can be transformed to clan parameters,
namely, the average number of clans and the average number of particles per clan (clan multiplicity) [1]. Clan parameters have been used to identify abnormalities due to a phase...
Dr
Iurii Karpenko
(Frankfurt Institute for Advanced Studies, Germany; Bogolyubov Institute for Theoretical Physics, Kiev, Ukraine)
20/05/2014, 16:30
Collective Dynamics
Poster
Following the BES program at BNL RHIC, we perform a similar collision energy scan using a 3+1D viscous hydrodynamics coupled to the UrQMD hadron cascade. We study how the collision energy affects the bulk observables: rapidity distributions and $m_T$-spectra of identified particles, elliptic flow, directed flow and HBT radii, including azimuthally-sensitive HBT. In our calculations we use an...
Ferenc Siklér
(Wigner RCP, Budapest (HU))
20/05/2014, 16:30
Correlations and Fluctuations
Poster
Short range correlations of identified charged hadrons in pp ($\sqrt{s}$ = 0.9, 2.76, and 7 TeV), pPb ($\sqrt{s_{NN}}$ = 5.02 TeV), and peripheral PbPb collisions ($\sqrt{s_{NN}}$ = 2.76 TeV) are studied with the CMS detector at the LHC. Charged pions, kaons, and protons at low $p_T$ and in laboratory pseudorapidity $|\eta| < 1$ are identified via their energy loss in the silicon tracker. The...
Tim Harris
(Trinity College, Dublin)
20/05/2014, 16:30
Open Heavy Flavour and Quarkonia
Poster
I will present some recent results from the FASTSUM collaboration on the bottomonium spectrum at finite temperature from lattice QCD.
From the calculation of the spectral functions using the maximum entropy method we confirm earlier findings on the survival of the ground state S wave states up to at least 2$T_c$ and observe further strong indications of the dissociation of the P wave ground...
Alexander Rothkopf
(H)
20/05/2014, 16:30
Open Heavy Flavour and Quarkonia
Poster
Understanding the suppression patterns of heavy Quarkonium promises valuable insight into the quark-gluon plasma created in relativistic heavy-ion collisions at RHIC and LHC. Here we present simulations of Bottomonium real-time evolution [1] in an idealized, i.e. static, QGP at high temperature, based on the open-quantum systems concept of stochastic potential [2].
If a heavy Quarkonium...
Koichi Murase
(The University of Tokyo)
20/05/2014, 16:30
Collective Dynamics
Poster
We formulate relativistic fluctuating hydrodynamics with causal hydrodynamic fluctuations and implement them into our dynamical model for more quantitative analysis of the transport coefficients of the matter created in heavy ion collisions.
The hydrodynamic fluctuations are thermal fluctuations arising in the event-by-event hydrodynamic evoluation of the system, and its power spectrum is...
Mathis Habich
(University of Colorado Boulder)
20/05/2014, 16:30
New Theoretical Developments
Poster
It has been show that hydrodynamic models provide an effective, phenomenological description of the QGP. The framework of hydrodynamics allows the occurrence of interesting phenomena like cavitation. Cavitation, in general, is the phase change from the liquid to the gaseous phase caused by a pressure drop.
First, one way of defining cavitation for relativistic hydrodynamics is presented....
Christopher Ryan Edwards-Bruner
(University of Kansas (US))
20/05/2014, 16:30
Initial State Physics
Poster
High energy proton lead collisions provide a unique tool to study the parton distribution function of nuclei at very low Bjorken x. The production of transverse energy at a given eta is sensitive to the gluon density in the nucleus, and by scanning over a very wide rapidity and centrality range, it is possible to glean information on the spatial and x dependence of the gluon density. The ratio...
Dr
Darren McGlinchey
(University of Colorado)
20/05/2014, 16:30
Initial State Physics
Poster
High energy proton- and deuteron-nucleus collisions provide an excellent tool for studying a wide array of physics effects, many of which are expected to have a significant dependence on the impact parameter of the collision, which is related to the collision centrality. We detail a method, employed by PHENIX, for determining centrality classes in $p(d)+A$ collisions via cuts on the produced...
Igor Lakomov
(Universite de Paris-Sud 11 (FR))
20/05/2014, 16:30
Open Heavy Flavour and Quarkonia
Poster
The study of proton-nucleus collision at LHC energies represents an important step in Quark-Gluon Plasma related studies, allowing a quantitative evaluation of cold nuclear matter effects on various observables.
The ALICE Collaboration is carrying out a comprehensive study on charmonium production in p-Pb collisions at $\sqrt{s_{\rm NN}} = 5.02$ TeV in the dimuon decay channel. The...
Alexander Milov
(Weizmann Institute of Science (IL))
20/05/2014, 16:30
Future Experimental Facilities, Upgrades, and Instrumentation
Poster
Parameters of the initial state of the heavy-ion (HI) interaction are commonly denoted by the term “centrality”. Centrality includes the impact parameter of the interaction, amount of interacting material and relative orientation of colliding nuclei. Unfortunately, none of these parameters can be directly measured. In all currently operating and planned HI experiments centrality is measured...
Masaru Hongo
(The University of Tokyo)
20/05/2014, 16:30
New Theoretical Developments
Poster
Anomaly-induced transport effects, like the chiral magnetic effect or the chiral separation effect, have recently attracted much attention. These effects represent the existence of dissipationless vector and axial currents along the magnetic field and are expected to occur in ultra-relativistic heavy-ion collisions. It has been pointed out that the coupling between the chiral magnetic effect...
Andrzej Rybicki
(Institute of Nuclear Physics, Polish Academy of Sciences),
Antoni Szczurek
(Institute of Nuclear Physics, Polish Academy of Sciences, and University of Rzeszów)
20/05/2014, 16:30
Collective Dynamics
Poster
We investigate the effect of the Coulomb field of the spectator matter on the directed and elliptic flow of charged pions. By means of a numerical Monte Carlo simulation, we find that the spectator charge induces sizeable values of directed flow. At beam and target rapidities, these can reach $v_1$=0.2 which is comparable to values reported by the WA98 collaboration in the corresponding...
Mr
Jason Bryslawskyj
(CUNY Baruch)
20/05/2014, 16:30
Jets
Poster
The nuclear modification factor of single hadrons still provides one of the strongest constraints on energy loss mechanisms in the Quark-Gluon Plasma. Currently the best measurement at RHIC is made with neutral pions. Charged hadrons have independent sources of systematic uncertainty and thus can provide additional constraints. In PHENIX, the background from conversions and weak decays...
Rudiger Haake
(Westfaelische Wilhelms-Universitaet Muenster (DE))
20/05/2014, 16:30
Jets
Poster
Highly energetic jets are sensitive probes for the kinematics and the topology of high energy collisions. They are produced in an early stage of the collision from hard scattered partons that hadronize and eventually form jets as a spray of charged and neutral particles.
The measurement in p-Pb provides an important reference to study the effects of cold nuclear matter on jet production and...
Heidi Schuldes
(Goethe-University Frankfurt)
20/05/2014, 16:30
QCD Phase Diagram
Poster
In the energy regime of 1-2 AGeV, strangeness is produced below its nucleon-nucleon production threshold, this results in a steep excitation function. Due to their quark content, positive and negative kaons have different nucleon-nucleon production thresholds. Furthermore K$^{+}$ are supposed to feel a repulsive kaon nucleon potential, while K$^-$ can be resonantly absorbed by...
Mr
Zachary Rowan
(CUNY Baruch for the PHENIX collaboration)
20/05/2014, 16:30
Approach to Equilibrium
Poster
In light of the recently realized possibility of hydrodynamic flow in small systems, we will study the charged particle pseudorapidity distribution as a function of collision centrality in the transition region between very peripheral and semi-central collisions, which still has not been carefully mapped out. Pseudorapidity distributions of charged particle production are important when...
Stephen Horvat
(STAR)
20/05/2014, 16:30
QCD at High Temperature and/or Density
Poster
Quenching of high transverse momentum ($p_{\mathrm{T}}$) charged hadrons can be measured by the nuclear modification factor, which compares binary collision-scaled $p_{\mathrm{T}}$ spectra from central heavy-ion collisions to a reference spectrum, either proton-proton ($R_{\mathrm{AA}}$) or peripheral heavy-ion collisions ($R_{\mathrm{CP}}$), by taking their ratio. At...
Dr
Hamza Berrehrah
(Frankfurt Institute for Advanced Studies (FIAS))
20/05/2014, 16:30
Open Heavy Flavour and Quarkonia
Poster
We study the in- and out-off equilibrium dynamics of heavy quarks in the strongly interacting partonic and hadronic medium within the Parton-Hadron-String Dynamics (PHSD) transport approach [1] which incorporates explicit partonic degrees-of-freedom in terms of strongly interacting quasi-particles (quarks and gluons) in line with an equation of state from lattice QCD as well as the dynamical...
J. Scott Moreland
(Duke University)
20/05/2014, 16:30
Open Heavy Flavour and Quarkonia
Poster
Heavy-flavour probes of the quark-gluon plasma (QGP) have yielded a number of surprising results. Due to their large mass and the temperature scale of the collision,
it was anticipated that the charm and bottom quarks would interact weakly with the produced medium. It therefore came as a surprise when experimental results for D mesons indicated
charm quarks with small $R_{AA}$ and large...
Dr
Taesoo Song
(Frankfurt Institute for Advanced Studies)
20/05/2014, 16:30
Open Heavy Flavour and Quarkonia
Poster
Using the color evaporation model, the cross section for charmonium production in p+p collision is calculated in quark-gluon plasma.
The threshold energy for open charms is given by the free energy potential from lattice calculations, the initial charm quark pairs by the Pythia simulations, and their time evolution by solving the Langevin equation.
It is found that the threshold energy which...
Prof.
Kang Seog Lee
(Chonnam National University)
20/05/2014, 16:30
Thermodynamics and Hadron Chemistry
Poster
Within a blast-wave model which assumes two different freeze-outs, i.e. the chemical and thermal ones, both the hadron multiplicities and the transverse momentum spectra of various hadrons are analyzed in one model. In this calculation multiplicities of both the thermal hadrons and those decayed from resonances in a certain rapidity interval are calculated separately and the sum is fitted to...
Mr
Dmytro Oliinychenko
(Frankfurt Institute for Advanced Studies, Frankfurt, Germany), Prof.
Kyrill Bugaev
(Bogolyubov Institute for Theoretical Physics, Kiev, Ukraine)
20/05/2014, 16:30
Thermodynamics and Hadron Chemistry
Poster
We made a thorough analysis of the hadron resonance gas model
for the Breit-Wigner and for the Gauss resonance width parameterizations [1].
The latter model allows us to treat the usual hadrons and the quark gluon bags on the same footing and to study the stability of the results obtained within different formulations of the hadron resonance gas model.
Three versions of this model...
Mr
David Scheffler
(TU Darmstadt)
20/05/2014, 16:30
QCD Phase Diagram
Poster
In preparation of lattice studies of the two-color QCD phase diagram we study chiral restoration and deconfinement at finite temperature with two flavors of staggered quarks using an RHMC algorithm on GPUs [1]. We measure the chiral condensate and the corresponding chiral susceptibility as a function of the lattice coupling across the chiral transition. Using Ferrenberg-Swendsen reweighting we...
Tigran Kalaydzhyan
(Stony Brook University)
20/05/2014, 16:30
QCD at High Temperature and/or Density
Poster
In this talk I will discuss new effects due to the appearance of the chiral superfluidity in two regimes of QCD. First, at low temperatures and finite density, where the cold pion condensate under rotation and in electromagnetic fields develops string-like defects with anomalous currents flowing along them. Second, at low density and high temperatures, slightly above the deconfinement...
Yue Shi Lai
(Massachusetts Inst. of Technology (US))
20/05/2014, 16:30
Jets
Poster
We present the latest development of a particle-flow-based jet reconstruction and underlying event subtraction algorithm in heavy ion collisions with CMS. This new algorithm uses a data-driven method to estimate the underlying event level from the forward calorimeter energy distribution, taking into account possible flow modulation. Unlike jet-level subtraction methods, this approach produces...
Sungtae Cho
20/05/2014, 16:30
Open Heavy Flavour and Quarkonia
Poster
It has been found that the nuclear modification factor of a J/Psi meson shows no significant dependence on centrality when going from Relativistic Heavy Ion Collider (RHIC) energy to Large Hadron Collider (LHC) energy, and it is believed that the regeneration of the J/Psi meson plays an important role in the production of J/Psi mesons. In this work we investigate the effects of the J/Psi meson...
Michal Broz
(Czech Technical University (CZ))
20/05/2014, 16:30
Electromagnetic Probes
Poster
Vector mesons are copiously produced in ultra-peripheral nucleus-nucleus collisions
In these collisions, the nuclei are separated by an impact parameter
larger than the sum of the nuclear radii.
The interaction proceeds through the emission of a photon, generated by the electromagnetic field of one of the two nuclei, fluctuating into a quark-antiquark pair,that interacts with the target...
Sangyong Jeon
(McGill University)
20/05/2014, 16:30
Initial State Physics
Poster
Within the Schwinger-Keldysh representation of many-body QCD, it is shown that the leading quantum corrections to the strong classical color field is “classical” in the sense that the fluctuation field still obeys the classical Jacobi-field equation, while the quantum effects solely resides in the fluctuations of the initial field configurations. Within this context, a systematic derivation of...
Prof.
Vladimir Filinov
(Joint Institute for High Temperatures, Russian Academy of Sciences, Moscow, Russia)
20/05/2014, 16:30
Thermodynamics and Hadron Chemistry
Poster
Based on the quasiparticle model of the quark-gluon plasma (QGP), a color quantum path-integral Monte-Carlo (PIMC) method for calculation of thermodynamic properties and -- closely related to the latter -- a Wigner dynamics method for calculation of transport properties of the QGP are formulated. The QGP partition function is presented in the form of a color path integral with a new...
Dr
Yannis Burnier
(EPFL)
20/05/2014, 16:30
QCD at High Temperature and/or Density
Poster
A precise definition of the $Q\bar Q$ potential at high temperature
was obtained in the framework of effective field theories.
The potential was calculated in hard thermal loop resummed perturbation theory and happens to be complex [1].
In ref. [2] the definition was adapted to Euclidean lattice simulations but difficulties were encountered with the infinite real time limit required to...
Dr
Minni Singla
(GSI)
20/05/2014, 16:30
Future Experimental Facilities, Upgrades, and Instrumentation
Poster
The Silicon Tracking System (STS) is the central detector system of the CBM experiment. Its task is to perform track reconstruction and momentum determination for all charged particles created in beam-target collisions at SIS 100 and SIS 300 beam energies. The technical challenges to meet are a high granularity matching the high track densities, a fast self-triggering read-out coping...
Hannu Paukkunen
(University of Jyväskylä)
20/05/2014, 16:30
Jets
Poster
The recent LHC and Tevatron data for inclusive high-$p_T$ charged hadron production in p+p(${\rm \bar{p}}$) collisions show a discrepancy in comparison to the NLO perturbative QCD predictions with modern fragmentation functions (FFs). We have quantified this observation by a systematic comparison between the calculations with different FF sets and data for several collision energies [1]. We...
Shuzhe SHI
(Tsinghua University)
20/05/2014, 16:30
QCD at High Temperature and/or Density
Poster
The conserved charge fluctuations, as quantified by the corresponding susceptibilities, provide important information about the charge-carriers and their dynamical correlations in strongly interacting matter such as the quark-gluon plasma. Using the gauge-gravity correspondence approach, we study the patterns of conserved charge fluctuations in two types of holographic models for QCD, the...
Nicolas Borghini
(University of Bielefeld)
20/05/2014, 16:30
Collective Dynamics
Poster
A decoupling dissipative fluid emits particles differently from an ideal one. The modification can be estimated with the help of a saddle-point calculation, which amounts to the limit of a low freeze-out temperature. Computing the anisotropic flow coefficients, we show that relations between different harmonics valid in the ideal case for particles with a higher velocity than the fluid no...
Frederique Grassi
20/05/2014, 16:30
Collective Dynamics
Poster
Hydrodynamic simulations together with models for the fluctuating initial
conditions lead to a good description of experimental data on all flow
harmonics. To complement these analyses which allow to constrain initial
fluctuations, one can use rapidity-odd directed flow to unravel the global initial geometry.
We discuss what properties of the tilt of the initial state is necessary...
Ekaterina Retinskaya
(CEA)
20/05/2014, 16:30
Collective Dynamics
Poster
We propose a systematic approach for constraining models of initial conditions using a combined analysis of elliptic $v_2$ and triangular $v_3$ flow data with viscous hydrodynamic calculations. For $v_2$ and $v_3$ harmonics the hydrodynamic response to the initial state is dominated by linear response, which means $v_2$ is proportional to the ellipticity $\varepsilon_2$ and $v_3$ is...
Jan Steinheimer
20/05/2014, 16:30
QCD Phase Diagram
Poster
We show how repulsive interactions of deconfined quarks as well as confined hadrons can be constrained in a straight forward way by model comparisons of baryon number susceptibilities with lattice QCD results . We also discuss implications for earlier constraints, extracted from the curvature of the transition line of QCD and compact star observables. Our results clearly point to a strong...
Saehanseul Oh
(Yale University (US))
20/05/2014, 16:30
Correlations and Fluctuations
Poster
Two-particle correlations have been widely used as a tool to explore particle production mechanisms in heavy ion collisions. The mixed-event method is generally considered as a standard method to correct correlation functions for effects of finite acceptance. We demonstrate that additive correlated signals, such as jets, are distorted by the mixed-event method and propose new methods for more...
Maciej Rybczynski
(Jan Kochanowski University (PL))
20/05/2014, 16:30
Correlations and Fluctuations
Poster
The nucleon-nucleon collision profile, being the basic entity
of the wounded nucleon model, is usually adopted in the form
of hard sphere or the Gaussian shape.
It has been noticed recently [1] that the cross section fluctuations,
given by the gamma distribution, lead to the profile function
which smoothly ranges between the both, above mentioned, limiting forms.
Nucleon-nucleon...
Alexey Aparin
(JINR)
20/05/2014, 16:30
Collective Dynamics
Poster
Experimental data on inclusive charged particle spectra in p+A collisions are analyzed in the framework of z-scaling. The data on cross sections were taken by groups of G.Leksin at FNAL (Batavia), L.Zolin and V.Gapienko at IHEP (Protvino) with nuclear targets from beryllium up to tungsten. Spectra cover a special kinematics known as a cumulative region. Cumulative particles can be only...
Dr
Vitalii OZVENCHUK
(subatech)
20/05/2014, 16:30
Open Heavy Flavour and Quarkonia
Poster
Models for the heavy flavor production in ultrarelativistic heavy ion
collisions suffer from a lack of elliptical flow as compared to the experimental data if they reproduce $R_{\rm AA}$, often referred to by experimentalists as a "tension between $R_{\rm AA}$ and $v_2$". One possible reason for this discrepancy may be the disregard of D-meson rescattering in hadronic matter in the...
Dr
Takashi Hachiya
(RIKEN)
20/05/2014, 16:30
Open Heavy Flavour and Quarkonia
Poster
The bottom quark is a powerful probe to study the characteristics of
QGP created in the high energy heavy ion collisions.
The bottom production can be measured using the non-prompt $J/\psi$ from B
decays (B -> $J/\psi$ + X).
It is possible to identify the $J/\psi$ through electron pairs measuring
a displaced vertex position using the silicon vertex detector (VTX).
In this poster, we will...
Dr
Lo Pok Man
(GSI)
20/05/2014, 16:30
QCD Phase Diagram
Poster
We explore the influence of heavy quarks on the deconfinement phase transition in an effective model for gluons interacting with dynamical quarks in color SU(3). With decreasing quark mass, the strength of the explicit breaking of the Z(3) symmetry grows and the first-order transition ends in a critical end point (CEP). The nature of the critical endpoint is examined by studying the...
Vladimir Kovalenko
(St. Petersburg State University (RU))
20/05/2014, 16:30
Correlations and Fluctuations
Poster
The correlation between the mean transverse momentum and the multiplicity of charged particles,
recently measured by the ALICE experiment in
${{\mathrm {p\kern-0.05em p}}}$, ${{\mbox{p-Pb}}}$ and ${{\mbox{Pb-Pb}}}$ collisions
at LHC,
is studied in the framework of string-parton Monte-Carlo model, in which the elementary collisions are realized
by interactions of color dipoles.
It enables...
Takao Sakaguchi
(BNL)
20/05/2014, 16:30
Jets
Poster
High $p_{T}$ hadrons as fragments of hard scattered patrons
are a powerful tool to probe the opacity of the system
produced in nucleus collisions, through the loss of their
momenta in the medium created. In the last decade, the
momentum loss was quantified in terms of suppression of
the yield at given $p_T$. We recently measured the
fractional momentum loss ($\delta p_{T}/p_{T}$,...
Mr
Atsuro Ikeda
(Osaka University)
20/05/2014, 16:30
Collective Dynamics
Poster
We study the transport property of charm quarks at finite temperature in
quenched lattice QCD with improved maximum entropy method (MEM).
We extend the MEM analysis to the product space of spectral functions at more
than two different momenta to take advantage of more data and the strong
correlation among Euclidean correlators with different momenta.
We find that this method drastically...
Tariq Mahmoud
(Universität Gießen)
20/05/2014, 16:30
Future Experimental Facilities, Upgrades, and Instrumentation
Poster
The Compressed Baryonic Matter (CBM) experiment will be a dedicated heavy-ion experiment at the future FAIR facility. In order to identify electrons, a RICH detector and several layers of TRDs will be employed. The RICH detector will be operated with CO2 as a radiator gas, a spherical glass mirror plane, and MAPMTs as photon detectors. The mirror system consists of about 70 square mirror...
Risto Paatelainen
(University of Jyväskylä)
20/05/2014, 16:30
Initial State Physics
Poster
Using next-to-leading order perturbative QCD and a conjecture of saturation to suppress the production of low energy quanta, we calculate the initial energy densities and formation times for the dissipative fluid dynamical evolution of the quark-gluon plasma produced in ultrarelativistic heavy ion collisions [1,2].
We identify the uncertainties of the model and demonstrate the predictive...
Carsten Omet
(GSI Helmholtzzentrum für Schwerionenforschung mbH)
20/05/2014, 16:30
Future Experimental Facilities, Upgrades, and Instrumentation
Poster
SIS300 is the second of the two planned new synchrotrons at FAIR (Facility for Antiproton and Ion Research) in Darmstadt, Germany. The high field values of up to 4.5 T for the dipoles require a so called $\cos{(\Theta)}$ design. The ramp rate of these magnets is 1 T/s, therefore special attention has been taken on the reduction of AC losses and the mechanical integrity of the magnets. For...
Pradeep Ghosh
(GSI)
20/05/2014, 16:30
Future Experimental Facilities, Upgrades, and Instrumentation
Poster
The building block of the CBM Silicon Tracking System is a detector module comprising double-sided silicon microstrip sensors, ultra-thin read-out cables, and novel front-end electronics. Various types of modules will be employed in the detector system, differing in sensor size and cable length.
We report on the development of the module components. The silicon sensors have a CBM specific...
Christian Pauly
(Bergische Universitaet Wuppertal (DE))
20/05/2014, 16:30
Future Experimental Facilities, Upgrades, and Instrumentation
Poster
The CBM-RICH detector is an essential component of the
CBM experiment which will be build at the Facility for Antiproton
and Ion Research, FAIR, in Darmstadt.
It will serve for electron identification and pion suppression
for particle momenta up to ~8 GeV/c.
Pion suppression by up to 4 orders of magnitude is necessary in
order to get access to rare di-electron decays of light vector...
Mr
Szymon Harabasz
(TU Darmstadt)
20/05/2014, 16:30
Electromagnetic Probes
Poster
Systematic studies of di-electron and strangeness production in the few GeV per nucleon energy regime have been performed in the past years with the High Acceptance Di-Electron Spectrometer, installed at GSI Helmholtzzentrum für Schwerionenforschung in Darmstadt.
In the most recent measurement, di-electron production for the heaviest collision system, Au+Au at the top SIS18 beam kinetic...
Hongyan Yang
(University of Utrecht (NL))
20/05/2014, 16:30
Electromagnetic Probes
Poster
Correlated unlike sign dielectrons provide important and relatively clean information to access the properties of the hot and dense matter, the Quark-Gluon Plasma (QGP), created in relativistic heavy-ion collisions. Once they are produced, they traverse the fireball without interacting strongly with the medium. The collective behaviour of the dielectrons with respect to a global event plane...
Mr
Yi Guo
(USTC)
20/05/2014, 16:30
Electromagnetic Probes
Poster
We report the STAR newest measurement of dielectron production in
Au+Au and p+p collisions at $\sqrt{s_{NN}}$ = 200GeV. The data sets
used in the analysis include large samples collected in 2010 and 2011
for Au+Au and 2012 for p+p which both yield about a factor of 3 more
statistics compared to previously reported STAR results.
We present the centrality and $p_{T}$ dependence of...
Heikki Mäntysaari
(University of Jyväskylä)
20/05/2014, 16:30
Initial State Physics
Poster
Deep inelastic scattering is a powerful tool to
study the structure of hadrons and test our understanding of the strong
interaction. The precise proton structure
function measurements done at HERA have been a crucial test for
the Color Glass Condensate effective field
theory description of the high energy hadronic interactions.
Ideally one would want to continue the analysis with...
Gyulnara Eyyubova
(Czech Technical University in Prague, FNSPE, Prague, Czech Republic)
20/05/2014, 16:30
Correlations and Fluctuations
Poster
The hybrid model HYDJET++, including soft and hard physics, is employed for the analysis of azimuthal anisotropy harmonics and dihadron angular correlations measured in PbPb collisions at $\sqrt{s_{NN}}$ = 2.76 TeV. The soft part of the model represents a thermal hadron production at the freeze-out hypersurface in accordance with hydrodynamical calculations. The possible triangular shape...
Dr
Somorendro Singh Shougaijam
(University of Delhi, Delhi)
20/05/2014, 16:30
Electromagnetic Probes
Poster
We extend to study the dilepton emission from heavy -ion collision of Quark-gluon Plasma incorporating the chemical potential and temperature dependent on quark mass. The dilepton emission rate is found to be enhanced in comparison to the earlier result of only temperature dependent value of quark mass and in comparison to other theoretical calculations. The study finds that the emission rate...
Kefeng Xin
20/05/2014, 16:30
Electromagnetic Probes
Poster
Dimuon production, which is sensitive to the early stage of heavy-ion collisions, provides a unique tool to study the Quark-Gluon Plasma.
At low invariant mass, the dimuon mass spectrum has the contributions from many mesons, such as $\eta$, $\omega$, $\eta\prime$. At the same time, the background from $\gamma$ conversion is largely suppressed compared to the background from dielectron...
Sanshiro Mizuno for the PHENIX Collaboration
(University of Tsukuba (JP))
20/05/2014, 16:30
Collective Dynamics
Poster
Direct photons are emitted from various processes from all stages from the beginning to the end of the high energy heavy ion collisions.
Theoretical models tell that the angular emission patterns of the photons are different depending on their production mechanism.
Previous published PHENIX results indicate that the second order Fourier coefficient ($v_{2}$) is positive for $p_{T}$<4.0GeV/c,...
Antonio Ortiz Velasquez
(Universidad Nacional Autonoma (MX))
20/05/2014, 16:30
Collective Dynamics
Poster
The complexity of the proton-proton interactions requires many theoretical models to describe the different features of the data. Typically, they are incorporated in MC event generators and their parameters are tuned to describe the average behaviour of specific quantities. However, this approach does not allow to understand in detail the impact of the different components in the measurable...
Dr
Ranjita Mohapatra
(Physical Research Laboratory)
20/05/2014, 16:30
QCD at High Temperature and/or Density
Poster
We model the initial confinement deconfinement transition in relativistic heavy-ion collisions as a rapid quench in view of expected rapid thermalization to a quark-gluon plasma state. The transition is studied using the Polyakov
loop model, with the initial field configuration (in the confining phase) covering a small neighborhood of the confining vacuum l= 0, as appropriate for
T < Tc....
Christian Wesp
(Goethe Universität Frankfurt)
20/05/2014, 16:30
QCD Phase Diagram
Poster
The intention of this study is the search for signatures of the chiral phase transition and the impact of non-equilibrium effects.
To investiage the impact of fluctuations, e.g. on the baryon density, near the chritical point or the chiral phase transition of QCD, we developed a 3+1D numerical, non-equilibrium simulation of an effective linear sigma model. Chiral fields are approximated as...
Dr
Akihiko Monnai
(RIKEN BNL Research Center)
20/05/2014, 16:30
Approach to Equilibrium
Poster
Local equilibration of a QCD medium has been a long-standing issue in hadron physics since the discovery of a nearly-perfect fluid in heavy-ion collisions at RHIC and LHC. The pre-collision state is considered to be described as color glass condensate, which has a relatively large number of high-momentum gluons but almost no quarks. The success of hydrodynamic approaches, on the other hand,...
Danuce Dudek
(Universidade Estadual Paulista)
20/05/2014, 16:30
Collective Dynamics
Poster
We present results of a systematic study of the role of the equation of state in the hydrodynamic model. By using the same initial conditions and freeze-out scenario, the effects of different equations of state are compared by calculating their respective hydrodynamical evolution, particle spectra, elliptic flow and HBT radii. Three different types of equation of state are studied, each...
Raghunath Sahoo
(Indian Institute of Technology Indore (IN))
20/05/2014, 16:30
Collective Dynamics
Poster
In this report, we consider an energy dissipation model for multiparticle production in heavy-ion collisions. The model considers the energy of a collision to be transformed into the produced particles as effective energy of participants, which drives the particle-production process. Within this model, we describe the dependencies of the two key observables, namely the midrapidity...
Mr
Philipp Scior
(TU Darmstadt)
20/05/2014, 16:30
QCD Phase Diagram
Poster
We compare different SU(2) Polyakov loop actions with data from full two-color QCD simulations around and above the critical temperature [1,2].
The effective actions are motivated by combined strong coupling and hopping expansions. We extract the effective couplings of our models by matching
Polyakov loop distributions and correlators from the efective models with those from full two-color...
Lilin Zhu
(Sichuan University)
20/05/2014, 16:30
Jets
Poster
The transverse momentum distributions of identified hadrons produced in Pb-Pb collisions at the Large Hadron Collider (LHC) are studied for $p_T$ up to 20 GeV/c. We use quark recombination to treat hadronization, applied uniformly at all $p_T$ based on a common thermal parton distribution of light and strange quarks and on shower patrons emitted in hard and semihard jets. Furthermore, we...
Ms
Miki Sakaida
(Osaka University)
20/05/2014, 16:30
Correlations and Fluctuations
Poster
We investigate the effects of the global charge conservation on the rapidity window dependences of fluctuations of conserved charges observed in heavy ion collisions. We describe the time evolution of the higher order fluctuations in the hadronic medium by solving the diffusion master equation with boundaries. Our result suggests that the effect of the global charge conservation for the...
Caio Alves Garcia Prado
(Universidade de Sao Paulo (BR))
20/05/2014, 16:30
Open Heavy Flavour and Quarkonia
Poster
Effects on the heavy quarks dynamics due to the medium formed in heavy ion
collisions are investigated, on an event-by-event basis, using a newly
developed 2D+1 Lagrangian ideal hydrodynamic code which is based on the
Smoothed Particle Hydrodynamics (SPH) algorithm. An energy loss model is
used on top of the evolving space-time energy density distributions for two
different schemes:...
Subrata Pal
(Tata Institute of Fundamental Research, Mumbai, India)
20/05/2014, 16:30
Collective Dynamics
Poster
We present a new method for analyzing anisotropic flow, $v_n$,
from the eigenmodes and eigenvalues of the two-particle correlation matrix
$\langle\cos n\Delta\phi\rangle$, where $\Delta\phi$ is the azimuthal
separation between two particles (in general
from different pseudorapidity bins), and angular
brackets denote an average over pairs of particles.
Methods currently used to...
Damian Reynolds
(State University of New York, Stony Brook)
20/05/2014, 16:30
Collective Dynamics
Poster
Considerable attention has been given to the investigation of anisotropic flow in heavy-ion collisions at both the Relativistic Heavy Ion Collider (RHIC) and the Large Hadron Collider (LHC).
The focus of current studies in this field is centered on the influence of the initial-state geometry [and its fluctuations] and its role in the extraction of the specific shear viscosity (i.e. the...
Mr
Peng Huo
(Stony Brook University)
20/05/2014, 16:30
Correlations and Fluctuations
Poster
Recent discovery of significant higher-order flow harmonics and theoretical study of the non-linear hydrodynamics have led to the realization of a large set of new event-by-event (EbyE) flow observables that can be measured in heavy-ion collisions. These observables can be expressed generally as a joint probability distribution of flow coefficients $v_n$ and their phases $\Phi_n$, $p(v_n, v_m,...
Dr
Yang-Ting Chien
(LANL)
20/05/2014, 16:30
Jets
Poster
The jet quenching phenomena, observed in heavy ion collisions at the LHC, present strong evidence for the strong modification of parton shower in the quark-gluon plasma. To understanding the longitudinal and transverse structure of medium-induced branching, observables that go beyond the suppression of inclusive and tagged jets are necessary. Here we present theoretical calculations of jet...
Katarzyna Deja
(National Centre for Nuclear Research)
20/05/2014, 16:30
Initial State Physics
Poster
The quark-gluon plasma at the early stage of relativistic heavy-ion collisions is unstable due chromomagnetic plasma modes. The energy loss per unit path length of a fast parton scattering elastically in such a plasma is studied as an initial value problem. Although the approach is designed to study the unstable plasma, the well known results of equilibrium plasma are also reproduced. The...
Mohammed Younus
(Variable Energy Cyclotron Centre)
20/05/2014, 16:30
Open Heavy Flavour and Quarkonia
Poster
Charm quarks are produced mostly in the pre-equilibrium phase in heavy ion collision. They serve as an excellent probe for quark gluon plasma which consists mainly of light quarks and mass-less gluons. Charm loses energy and momentum in this medium and comes out ultimately as D meson or later undergoes semi-leptonic decay which is experimentally observed. Here we present the evolution and...
Dr
Jacquelyn Noronha-Hostler
(University of Sao Paulo)
20/05/2014, 16:30
Collective Dynamics
Poster
Shear and bulk viscosity effects on the collective flow harmonics in heavy ion
collisions are investigated, on an event by event basis, using a newly
developed 2+1 Lagrangian hydrodynamic code named v-USPhydro which implements
the Smoothed Particle Hydrodynamics (SPH) algorithm for viscous
hydrodynamics. A new formula for the bulk viscous corrections present in the
distribution function...
Jacobus Onderwaater
(GSI - Helmholtzzentrum fur Schwerionenforschung GmbH (DE))
20/05/2014, 16:30
Collective Dynamics
Poster
Measuring collective phenomena in heavy-ion collisions, such as anisotropic flow and its fluctuations, requires an estimate of the collision symmetry plane for different flow harmonics. Each plane's orientation is estimated from the azimuthal distribution of produced particles or from spectators' deflection. Azimuthal non-uniformity in the detector response distorts azimuthal distributions and...
Yuji Hirono
(The University of Tokyo)
20/05/2014, 16:30
Collective Dynamics
Poster
The quark gluon plasma (QGP), which consists of deconfined quarks and gluons, is expected to have filled the early Universe, and is also produced experimentally through the relativistic heavy-ion collisions at Relativistic Heavy Ion Collider (RHIC) in BNL and Large Hadron Collider (LHC) in CERN. There has been much effort to extract detailed properties of the QGP by constraining transport...
Redmer Alexander Bertens
(University of Utrecht (NL))
20/05/2014, 16:30
Jets
Poster
The heavy-ion program at ALICE is aimed at studying strongly interacting matter in ultra-relativistic nuclear collisions where the formation of a quark-gluon plasma (QGP) is expected. Jets can be used to probe the QGP.
Earlier studies at the LHC have shown that jet production is suppressed in heavy-ion collisions. This suppression is attributed to elastic and/or radiative interactions...
Jorge Noronha
(University of Sao Paulo)
20/05/2014, 16:30
New Theoretical Developments
Poster
In this talk I will describe the recent progress towards deriving analytical solutions of 2nd order viscous conformal hydrodynamics. I will first explain the recently obtained analytical (and semi-analytical) transversally expanding solutions of 2nd order viscous conformal hydrodynamics involving the so-called boost invariant Gubser flow, which has been recently used as a powerful test...
Radoslaw Ryblewski
(Institute of Nuclear Physics PAS)
20/05/2014, 16:30
Collective Dynamics
Poster
Experimental and theoretical studies of relativistic heavy-ion collisions showed that the behavior of matter produced in such collisions is very well described within hydrodynamic models. These results brought a lot of attention to the studies of kinetic coefficients whose values determine the magnitude of important observables such as the elliptic flow. Interestingly, different theoretical...
Daniel Tapia Takaki
(Universite de Paris-Sud 11 (FR))
20/05/2014, 16:30
Open Heavy Flavour and Quarkonia
Poster
The ALICE Collaboration has measured exclusive J/$\psi$ photoproduction off protons in ultra-peripheral proton-lead collisions at $\sqrt{s_{\rm NN}}=5.02$ TeV for the first time. Exclusive photoproduction of charmonium is a powerful tool to search for saturation effects. Although gluon saturation is the most straightforward mechanism to slow down the growth of the probability density function...
Dr
Christoph Herold
20/05/2014, 16:30
QCD at High Temperature and/or Density
Poster
A potential discovery of the first-order phase transition, which is conjectured in the QCD phase diagram at high net-baryon densities, would undoubtedly demand the existence of a critical point. We present results from a fluid dynamical model of the QCD phase transition in heavy ion collisions. Non-equilibrium effects in the evolution of the fluctuations of the order parameters are included...
Wladyslaw Henryk Trzaska
(University of Jyvaskyla (FI))
20/05/2014, 16:30
Future Experimental Facilities, Upgrades, and Instrumentation
Poster
As a result of the LHC upgrade after the Long Shutdown 2, the expected luminosity and collision rate during the so called Run 3 will considerably exceed the design parameters for several of the key ALICE detectors systems including the forward trigger detectors. Furthermore, the introduction of a new Muon Forward Tracker significantly reduces the space envelope available for the upgraded Fast...
Denise Aparecida Moreira De Godoy
(Laboratoire de Physique Subatomique et des Technologies Associe)
20/05/2014, 16:30
Open Heavy Flavour and Quarkonia
Poster
In heavy-ion collisions at ultrarelativistic energies a sufficiently high temperature can be reached to form the Quark-Gluon Plasma (QGP), a deconfined state of strongly-interacting matter. Heavy quarks, i.e. charm and beauty, serve as a sensitive probe of the QGP properties since they are predominantly produced in initial hard scattering processes and interact with the hot and dense...
Grigory Nigmatkulov
(N)
20/05/2014, 16:30
Correlations and Fluctuations
Poster
Two-particle correlations at low relative momentum
provide information on the space-time geometry of
emitting sources on the femtoscopic scale.
Dynamical properties of the system are reflected
in the total pair momentum dependence of the correlations.
We present a preliminary measurement of the multiplicity
and transverse momentum dependence of charged kaon
correlations at small...
Dr
Valery Lyuboshitz
(Joint Institute for Nuclear Research ( Dubna ))
20/05/2014, 16:30
Correlations and Fluctuations
Poster
The process of emission of two identical particles with
nonzero spin $S$ and different helicities is theoretically
investigated within the model of one-particle multipole
sources. Taking into account the unitarity of the finite
rotation matrix and symmetry relations for $d$--functions,
the general expression for probability of emission of
two identical particles by two...
Jai Salzwedel
(Ohio State University (US))
20/05/2014, 16:30
Correlations and Fluctuations
Poster
For two-particle systems with a well known interaction, ranging from pion-pion to proton-lambda, femtoscopy is used to measure the space-time characteristics of the fireball created in heavy-ion collisions at kinetic freeze-out. For less known systems, femtoscopy can be used to extract nuclear scattering information for the particles being studied. In particular, the scattering length and...
Daniel Berenyi
(Wigner RCP of the Hungarian Academy of Sciences, Hungary)
20/05/2014, 16:30
New Theoretical Developments
Poster
In the early stage of relativistic heavy ion collisions a strong coherent gluonic field could form. This phenomenon is usually described by the string model and it became the basis of successful Monte Carlo event generators. The usual string picture can be connected to an assumption of a static homogeneous gluonic field. On the other hand during the collision one expects large inhomogeneities...
Guo-Liang Ma
(Shanghai INstitute of Applied Physics (SINAP), CAS)
20/05/2014, 16:30
Collective Dynamics
Poster
Within a multi-phase transport (AMPT) model with string melting mechanism and an imported electric charge quadrupole distribution in the initial partonic coordinate space, the elliptic flow asymmetry between positive and negative pions is investigated. The slope parameter $r$ of the linear dependence of $\Delta v_{2}=v_{2}(\pi^{-})-v_{2}(\pi^{+})$ on $A_{ch}=(N^{+}-N^{-})/(N^{+}+N^{-})$ is...
Mr
Taekwang Kim
(Osaka University)
20/05/2014, 16:30
Electromagnetic Probes
Poster
We analyze the production rate of dileptons from the deconfined medium using a quark propagator obtained from a first principle lattice QCD numerical simulation. We calculate the dilepton production rate non-perturbatively at two temperatures in the deconfined phase with the quark propagator measured on the lattice. The photon-quark vertex is determined gauge-invariantly, so as to satisfy the...
Zsolt Schram
(U)
20/05/2014, 16:30
New Theoretical Developments
Poster
In high energy heavy ion collisions, both thermal and hydrodynamical
models have been applied quite successfully to describe single particle
observables. Here we investigate a rather different approach: we analyze
the classical electromagnetic radiation of an accelerating point
charge moving on a straight line trajectory. Depending on the duration
of accelerations, rapidity distributions...
Dujuan Wang
(University of Bergen)
20/05/2014, 16:30
Collective Dynamics
Poster
The vorticity development is studied in the reaction plane of peripheral relativistic heavy ion reactions where the initial state has substantial angular momentum. The rotation effect and Kelvin Helmholtz Instability (KHI), lead to significant initial vorticity and circulation. This is also shown in an exact analytical fluid dynamic model, the conditions for the development of KHI for the QGP...
Dr
Ananta P. Mishra
(Physical Research Laboratory, Ahmedabad)
20/05/2014, 16:30
Correlations and Fluctuations
Poster
Formalism to calculate the hydrodynamic fluctuations by applying the Onsager theory to the relativistic Navier-Stokes equation is already known. In this work, we calculate hydrodynamic-fluctuations in the framework of the causal hydrodynamics of M\"{u}ller, Israel and Stewart and the other related approaches. We show that expressions for the Onsager-coefficients and the correlation-functions...
Thomas Peitzmann
(University of Utrecht (NL))
20/05/2014, 16:30
Future Experimental Facilities, Upgrades, and Instrumentation
Poster
A forward electromagnetic calorimeter (FoCal) based on SiW technology is
being considered as a possible upgrade to the ALICE detector. The main
driving force behind this detector is the ability to measure direct
photons in a so far unreachable part of phase space. It should thus
provide unique information relevant for the study of the small-x
structure of nucleons and nuclei and possible...
Tim Schuster
(Yale University (US))
20/05/2014, 16:30
Correlations and Fluctuations
Poster
Two-particle correlation studies in high-multiplicity p--Pb collisions
at $\sqrt{s_{\mathrm{NN}}} = 5.02~\mathrm{TeV}$ have revealed a long-range
correlation pattern underneath the expected jet correlations. This symmetric
double-ridge pattern extends to large pseudorapidity difference. Long-range
correlations were also observed in pp collisions with extreme multiplicity at
LHC energies....
Adam Olszewski
(Jan Kochanowski University)
20/05/2014, 16:30
Correlations and Fluctuations
Poster
Multiplicity correlations between distant forward and backward
(FB) rapidity regions in relativistic heavy-ion collisions are examined
in a superposition framework. Our three-stage approach incorporates
the fluctuations of parton production in the early phase (modeled
with the Glauber simulations), the effects of intermediate hydrodynamic
evolution, and fluctuations in the production...
250.
Forward-backward multiplicity correlations in pp collisions at $\sqrt{s}$ = 0.9, 2.76 and 7 TeV
Igor Altsybeev
(St. Petersburg State University (RU)),
Sudipan De
(Department of Atomic Energy (IN))
20/05/2014, 16:30
Correlations and Fluctuations
Poster
Forward-backward multiplicity correlations have been measured with the ALICE detector at the LHC in pp minimum bias collisions at $\sqrt{s}$ = 0.9, 2.76 and 7 TeV. The measurement is performed in the central pseudorapidity region ($|\eta| < 0.8$) for $p_{\mathrm{T}}>0.3$ GeV/$c$. The multiplicity correlation strength ($b_{\rm corr}$) was obtained using pairs of separate pseudorapidity and...
Alice Zimmermann
(Ruprecht-Karls-Universitaet Heidelberg (DE)),
Vit Kucera
(Acad. of Sciences of the Czech Rep. (CZ))
20/05/2014, 16:30
Jets
Poster
The research programme of the ALICE experiment at the LHC focuses on studies of the quark-gluon plasma, a state of matter where quarks and gluons are deconfined.
The measurement of jets originating from the fragmentation of hard-scattered partons in the early phases of a nuclear collision allows one to study parton energy loss in the hot and dense medium and provides constraints on...
Denes Molnar
(Purdue University)
20/05/2014, 16:30
Jets
Poster
The PHENIX Collaboration has argued that azimuthal angle dependent pi0 suppression in Au+Au at RHIC poses a challenge for perturbative QCD energy loss models. Recent work by Betz and Gyulassy on the other hand claims simultaneous reproduction of this set of observables with simple pQCD-motivated energy loss formulas, in contrast with our earlier finding that realistic transverse expansion...
Szabolcs Borsanyi
(University of Wuppertal)
20/05/2014, 16:30
Correlations and Fluctuations
Poster
We explore various moments of conserved charges that
can act as a freeze-out thermometer at large collision
energies. We present the continuum extrapolated lattice
results of the Wuppertal-Budapest collaboration for
these candidates and discuss further implications to
our understanding of the QCD transition. We compare
our results to the expectations based on the hadron
resonance gas model.
Ivan Melo
(University of Zilina (SK))
20/05/2014, 16:30
Collective Dynamics
Poster
We analyse identified hadron spectra in transverse momentum with the
help of blast-wave model. Our approach properly includes all resonance
decays contributing to hadron production. It is shown that there is no
window in the transverse momentum where this contribution can be
safely neglected in order to use simpler analytical formulas in the
fit procedure. Based on the comparison of...
Mr
Tiago Nunes da Silva
(University of Groningen)
20/05/2014, 16:30
Relations to Other Strongly Interacting Systems
Poster
We discuss our results on the thermal phase transition in color $SU(3)$ QCD with a large number $N_f$ of fundamental fermions using lattice gauge theory. We study the dependence of the critical temperature $T_c$ of the transition and of the coupling at $T_c$ on $N_f$. These results are used to investigate precursory effects of conformality associated with the emergence of a non-trivial fixed...
Axel Maas
(University of Jena)
20/05/2014, 16:30
QCD Phase Diagram
Poster
G2 gauge theories are variants of QCD and Yang-Mills theory where the gauge group SU(3) has been replaced by the exceptional group G2. These theories permit to study aspects of QCD which are hard to access otherwise. Especially, these theories are accessible to lattice simulations at finite density, and it is thus possible to determine the phase diagram completely. Because G2 QCD has also...
Alexander Hansen
(University of Copenhagen (DK))
20/05/2014, 16:30
Correlations and Fluctuations
Poster
We present a new generic framework which enables exact and fast evaluation of all multi-particle azimuthal correlations. The framework can be readily used along with a correction framework for systematic biases in anisotropic flow analyses due to various detector inefficiencies. A new recursive algorithm has been developed for higher order correlators for the cases where their direct...
Alina Czajka
(Jan Kochanowski University)
20/05/2014, 16:30
New Theoretical Developments
Poster
The quark-gluon plasma at the early stage of relativistic heavy-ion collisions is out of equilibrium. The Keldysh-Schwinger formalism provides a natural framework to describe such a plasma, in particular when the plasma is weakly coupled and perturbative methods are applicable. However, a perturbative computation of various QCD characteristics requires Faddeev-Popov ghosts to cancel ...
Mr
Michael Lomnitz
(Kent State University)
20/05/2014, 16:30
Future Experimental Facilities, Upgrades, and Instrumentation
Poster
We present an overview of two global alignment procedures developed for the Heavy Flavor Tracker[1] (HFT), the new silicon upgrade detector of STAR experiment at RHIC. Both methods are iterative minimization techniques and use as input the hit residual information from primary tracks reconstructed by the STAR TPC. One relies on a factorization of the alignment steps and uses histogramming...
Surasree Mazumder
(Variable Energy Cyclotron Centre, Kolkata)
20/05/2014, 16:30
Open Heavy Flavour and Quarkonia
Poster
The effect of soft gluon bremsstrahlung off the charm quark
on different transport coefficients like
drag, transverse and longitudinal diffusion of charm
has been observed while it is propagating inside Quark Gluon Plasma.
The elastic collision of charm with the medium particles and
the gluon radiation are seen to contribute in comparable
magnitudes while evaluating of the transport...
Mr
Kota Masuda
(Univ. of Tokyo / RIKEN)
20/05/2014, 16:30
QCD Phase Diagram
Poster
Recent observations of two solar-mass neutron stars
bring a serious conflict between the stiff equation of state (EOS)
required from the observations and the soft EOS
with hyperons required from theory.
We call this problem the "Hyperon Crisis".
We propose a possible resolution of this problem
from the point of view of the smooth crossover
between the hadronic matter with hyperons...
Dr
Anthony Francis
(Helmholtz Institut Mainz)
20/05/2014, 16:30
QCD at High Temperature and/or Density
Poster
The static forces between electric charges and currents are modified at the loop level by the presence of a plasma. While electric charges are screened, currents are not. This can be understood as medium-induced ‘antiscreening’ of the Ampere force and enters the constitutive equation of the electric current at second order in a ‘hydrodynamic’ description as the quantity $\kappa_t$. We...
Matthew Wysocki
(Oak Ridge National Lab)
20/05/2014, 16:30
Open Heavy Flavour and Quarkonia
Poster
The dynamics of heavy flavor production and suppression in $A$+$A$ collisions play an important role in unraveling the properties of the quark-gluon plasma produced at RHIC. The related observables offer direct insight into strongly-coupled nature of the medium. It has also become increasingly apparent that the production and suppression in the absence of a hot medium need to be studied in...
Marzia Nardi
(INFN)
20/05/2014, 16:30
Open Heavy Flavour and Quarkonia
Poster
I will present very recent results on heavy-quark (and meson) azimuthal correlations in proton-proton and nucleus-nucleus collisions at LHC energies.
We simulate the $c-\bar{c}$ and $b-\bar{b}$ pair initial creation
with a perturbative QCD approach (POWHEG+PYTHIA).
Successively we study the propagation of the heavy quarks in the plasma with the relativistic Langevin equation and,...
Jay Dunkelberger
(UCLA)
20/05/2014, 16:30
Open Heavy Flavour and Quarkonia
Poster
Measurements of heavy flavor $R_{AA}$ have shown a large suppression in central heavy ion collisions, indicating the importance of both gluon radiation and collisional energy loss in models of heavy quark propagation. There is still considerable uncertainty around the energy loss mechanisms of heavy quarks in QGP: the relative contribution of radiative and collisional interactions to the...
Kazuhiro Watanabe
(The University of Tokyo)
20/05/2014, 16:30
Open Heavy Flavour and Quarkonia
Poster
Understanding of the initial state effects on heavy ion collisions
is indispensable for quantifying the subsequent hot medium effects
in the observables.
Heavy quark pair production in proton-nucleus (pA)
collisions provides us with a unique opportunity to probe the gluons
at small Bjorken's x in the heavy target nucleus,
where the so-called parton saturation effect becomes...
Mr
Andreas Samberg
(Institute for Theoretical Physics, Heidelberg University)
20/05/2014, 16:30
New Theoretical Developments
Poster
We study the properties of heavy quarks as probes of strongly coupled
plasmas with non-zero chemical potential by means of deformations of
the gauge/gravity (AdS/CFT) duality. We compute the screening
distance of a heavy quark-antiquark pair, its free energy, and the
running coupling, as well as the drag force experienced by a single
quark in large classes of models. The screening...
Sanghoon Lim
(Yonsei University)
20/05/2014, 16:30
Open Heavy Flavour and Quarkonia
Poster
The measurement of single muons from semi-leptonic decay of mostly $D$ an $B$ mesons is a well developed method to study heavy quark production at forward rapidity at PHENIX experiment. Such measurement in $d+$Au collisions in wide rapidity ranges is essential to study initial-state cold nuclear matter effects, e.g. modification of parton distribution function, $p_{T}$ broadening, and energy...
Dr
Juan Torres-Rincon
(Institut de Ciencies de l'Espai)
20/05/2014, 16:30
Open Heavy Flavour and Quarkonia
Poster
Heavy mesons can be reconstructed in high-energy ion collisions from the detected electrons coming from their semileptonic decays. Due the their large mass ($m_D,m_B \gg \Lambda_{QCD}$) they carry important information about the initial stages of the heavy-ion collision. In particular, the $D$-meson $R_{AA}$ and $v_2$ have already been extracted in the RHIC and the LHC. These...
Hendrik van Hees
(Goethe University Frankfurt and FIAS)
20/05/2014, 16:30
Open Heavy Flavour and Quarkonia
Poster
Heavy charm and bottom quarks provide an important probe of the
transport properties of the quark-gluon plasma, created in heavy-ion
collisions at the Large Hadron Collider (LHC). They are produced in the
early hard collisions and then interact with the hot and dense medium,
consisting of light quarks and gluons, undergoing a phase transition to
a hot and dense hadron gas. Using a hybrid...
Guannan Xie
(for the STAR Collaboration)
20/05/2014, 16:30
Open Heavy Flavour and Quarkonia
Poster
The Relativistic Heavy-Ion Collider (RHIC) is built to search for the QGP in laboratory through the high energy heavy ion collisions. Suppression of the $J/\psi$ production due to color screening of the $c\overline{c}$ binding potential in the deconfined medium has been proposed as a signature of the QGP formation. High-$p_T$ $J/\psi$ measurements in $Au+Au$ collisions at RHIC published...
Mr
Xiaozhi Bai
(University of Illinois at Chicago), Prof.
Zhenyu Ye
(University of Illinois at Chicago)
20/05/2014, 16:30
Open Heavy Flavour and Quarkonia
Poster
Measurement of heavy flavor production in proton-proton collisions tests the validity of the pQCD frameworks for the heavy quark production. It also provides a baseline for the interpretation of heavy flavor production in nucleus-nucleus collisions. We present an improved measurement of non-photonic electron (NPE) production at high transverse momentum (2.5<$p_{T}$<12 GeV/c) in proton-proton...
Dr
Catalin Ristea
(Faculty of Physics, University of Bucharest, Institute of Space Science, Magurele)
20/05/2014, 16:30
Correlations and Fluctuations
Poster
Heavy ion reactions at ultrarelativistic energies provide information on strongly interacting matter under extreme conditions. In these collisions a large number of particles of different types is produced. Current understanding of such collisions suggest that the production of a QGP phase in relativistic heavy ion collisions could produce significant event-by-event correlations and...
Mate Csanad
20/05/2014, 16:30
Collective Dynamics
Poster
The time evolution of the medium created in heavy ion collisions can be described by hydrodynamical models. After expansion and cooling, the hadrons are created in a freeze-out. Their distribution describes the final state of this medium. Exact hydrodynamics provides a tool to have an analytic handle on the connection between the initial state, the dynamic parameters of the system and the...
Dr
Paolo Giuseppe Alba
(University of Turin)
20/05/2014, 16:30
QCD Phase Diagram
Poster
In recent years, the study of fluctuations of conserved charges has
received increasing attention: they turned out to be a promising tool to
study the deconfinement phase transition of QCD, the existence of a
critical point in the phase diagram and, more recently, the freeze-out
conditions in heavy-ion collisions (HICs).
Recent lattice QCD simulations and phenomenological models have...
Stanislav Lisniak
(Ecole Polytechnique (FR))
20/05/2014, 16:30
Future Experimental Facilities, Upgrades, and Instrumentation
Poster
The Hough transform is a pattern recognition technique well suited for identifying charged particle trajectories, which is used in several high-energy and heavy-ion physics experiments. The CMS experiment currently uses a combinatorial track-following method for both proton and heavy-ion collisions. In this poster we explore the possibility of using the Hough transform method in heavy ions....
Martin Schulc
(Czech Technical University (CZ))
20/05/2014, 16:30
Collective Dynamics
Poster
We perform event-by-event (3+1)-dimensional ideal hydrodynamic simulation with source terms that describe energy and momentum deposition from hard partons into expanding medium and study interplay of perturbations due to various number of leading particles propagating in various directions. This type of perturbations differs qualitatively from simulations with fluctuating initial conditions by...
Dr
Christophe Rappold
(Justus-Liebig-Universit\"at Giessen & GSI Helmholtz Centre for Heavy Ion Research)
20/05/2014, 16:30
Thermodynamics and Hadron Chemistry
Poster
The HypHI collaboration aimed to demonstrate the feasibility of the spectroscopy of hypernuclei produced in heavy-ion and rare isotope induced reactions. A first experiment was performed on October 2009 with a $^{6}$Li beam bombarded on a $^{12}$C carbon fixed target at 2 $A$GeV. In a second experiment in March 2010, a different beam nucleus of $^{20}$Ne at 2 $A$GeV was employed in a similar...
Ron Belmont
(Wayne State University (US))
20/05/2014, 16:30
Collective Dynamics
Poster
PHENIX has recently reported [Phys. Rev. C88 024906] measurements of identified charged hadron spectra and ratios in Au+Au and d+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV. Identified hadrons are an important probe of both hot and cold nuclear matter. The intermediate $p_T$ region, 2--5~GeV/c, is of particular interest. In Au+Au collisions, the production of mesons is suppressed in this $p_T$...
Hans Beck
(Johann-Wolfgang-Goethe Univ. (DE))
20/05/2014, 16:30
Correlations and Fluctuations
Poster
Two-particle momentum correlations carry important information about the space-time characteristics of the particle emission region. Femtoscopic correlations at low relative momentum arise from quantum statistics (for identical particle pairs) and final-state interactions (for both identical and non-identical pairs) and are used to probe the homogeneity lengths of the emitting source....
Shikshit Gupta
(University of Jammu)
20/05/2014, 16:30
Thermodynamics and Hadron Chemistry
Poster
It is important to study the particle production as a function of both
transverse momentum ($p_{T}$) and particle species which provide crucial
input for modeling of hadronic interactions and the hadronization process
in high-energy collisions [1]. In this contribution, we will present the
results on $\pi^{\pm}$, $K^{\pm}$, $p$ and $\bar{p}$
in $p+p$ collisions at $\sqrt{s}$ = 62.4 GeV...
Gyula Bencedi
(Hungarian Academy of Sciences (HU))
20/05/2014, 16:30
Correlations and Fluctuations
Poster
Unidentified two-particle correlations are widely pursued at RHIC and LHC to investigate particle production
and hadronization mechanisms as well as collective effects. Two-particle correlations with identified trigger
and identified associated particles give information on quantum number conservation and the flavour balance
during parton fragmentation and hadronization, however their...
Biswarup Paul
(Saha Institute of Nuclear Physics (IN))
20/05/2014, 16:30
Open Heavy Flavour and Quarkonia
Poster
The ALICE collaboration has studied inclusive J/$\psi$ and $\psi$(2S) production at forward rapidities in pp collisions at $\sqrt{s} = 7$ TeV and 8 TeV with integrated luminosity $\mathcal{L}_{\rm int}$ = 1.35 pb$^{-1}$ and 584 nb$^{-1}$, respectively.
The integrated and differential production cross-sections of J/$\psi$ and $\psi$(2S) will be presented. The comparison with the LHCb results...
Megan Elizabeth Connors
(Yale University (US))
20/05/2014, 16:30
Jets
Poster
Jet suppression has been observed in central heavy-ion collisions. This suppression is attributed to partonic energy loss in the Quark-Gluon Plasma (QGP) formed in such collisions. However, this measurement is influenced by all stages of the collision. It is expected that in p-Pb collisions the same initial conditions occur as in Pb-Pb collisions without creating a QGP, allowing any cold...
Jan Rusnak
(Nuclear Physics Institute Prague)
20/05/2014, 16:30
Jets
Poster
Jet interaction in the medium provides sensitive observables to study
properties of the hot and dense nuclear matter created in heavy-ion
collisions. However, due to the large and fluctuating background, full jet
reconstruction in heavy-ion collisions is an extremely challenging
task.
In this poster, we present a new measurement of the inclusive spectra
of reconstructed jets in...
Kazuya Nishiyama
(Kyoto U.)
20/05/2014, 16:30
QCD Phase Diagram
Poster
There have been theoretically and experimentally explored the QCD phase diagram in the density ($\mu$)-temperature ($T$) plane.
Usually the phase structure is studied by assuming the spatially and temporally constant order parameter.
Recently the possibility of inhomogeneous chiral phase has attracted much interest [1,2] in the light of progress in heavy-ion collisions or observation of...
Mr
Achim Heinz
(ITP Frankfurt am Main)
20/05/2014, 16:30
QCD Phase Diagram
Poster
Chiral symmetry is a symmetry of the QCD Lagrangian, which is
spontaneously broken due to nonperturbative phenomena. As a con-
sequence, a chiral condensate, which corresponds to a vacuum’s con-
densate of quark-antiquark pairs, emerges. Usually, this condensate is
treated as constant over space, but analytic as well as numerical stud-
ies show that an inhomogenous condensation is favored...
Dr
Grzegorz Stefanek
(Jan Kochanowski University (PL))
20/05/2014, 16:30
Initial State Physics
Poster
Fluctuations in physics observables and flow effects in heavy-ion collisions
have been topics of particularly interest in recent years as they may provide
important signals regarding the formation of quark-gluon plasma, the existence of a critical point and the evolution of the system. Moreover, the fluctuations and correlations measured in the final stage have their sources at least partly...
Dr
Yaping Wang
(University of Illinois at Chicago), Dr
Zhenyu Ye
(University of Illinois at Chicago)
20/05/2014, 16:30
Future Experimental Facilities, Upgrades, and Instrumentation
Poster
A Heavy Flavor Tracker (HFT) has been installed in the STAR experiment at the Relativistic Heavy Ion Collider since January 2014. It greatly enhances the capability for heavy flavor studies by measurements of displaced vertices and direct topological reconstruction of open charm hadrons. The HFT consists of two inner layers of silicon pixel detectors, an intermediate layer of silicon pad...
Dr
Xilin Zhang
(Institute of Nuclear and Particle Physics and Department of Physics and Astronomy, Ohio University, Athens, OH, USA)
20/05/2014, 16:30
Jets
Poster
High energy jets, penetrating the hot QCD matter created in heavy ion collisions, provide unique probe of the medium property. Recently there has been a lot of interests in extracting the possibly nontrivial temperature dependence of the jet-medium coupling. Particularly sensitive to such T-dependence are two sets of observables: the anisotropy of jet energy loss via the azimuthal angle...
Xiangrong Zhu
(Central China Normal University CCNU (CN))
20/05/2014, 16:30
Jets
Poster
Correlations between high-$p_{\rm T}$ photons or leading hadrons and charged
hadrons are considered as a sensitive probe for studying medium-induced
parton energy loss and jet modification in heavy-ion collisions.
The prompt photons are produced in association with jets in pp and Pb-Pb
collisions. Such processes can be tagged experimentally via photon
isolation analysis and the...
Barbara Trzeciak
(Czech Technical University in Prague)
20/05/2014, 16:30
Open Heavy Flavour and Quarkonia
Poster
Experimental data on the J/$\psi$ cross section in $p$+$p$ collisions can be described relatively well by many models that are currently available on the market. These models have different predictions regarding the J/$\psi$ polarization. Therefore measurements of the J/$\psi$ polarization may allow discriminating among the models and provide new insight into on the J/$\psi$ production...
Daisuke Watanabe
(University of Tsukuba (JP))
20/05/2014, 16:30
Jets
Poster
Jet measurements play an essential role in probing the hot and high energy density matter in heavy-ion collisions through parton energy loss and in observation of possible modification of the hot and dense matter by the deposited energy.
In this poster, we report azimuthal distributions of charged jets with respect to high $p_{\rm T}$ neutral pion triggers in pp collisions at $\sqrt{\rm s}$ =...
Rone Andrade
(Universidade de São Paulo USP)
20/05/2014, 16:30
Jets
Poster
In this talk we shall discuss how the energy-momentum deposited by partonic dijets in the quark-gluon plasma may affect the direct, elliptic and triangular flow of low (and intermediate) $p_T$ hadrons in Au+Au collisions at RHIC. The dijets are modeled as external sources in the energy-momentum conservation equations, which are solved on an event-by-event basis within the ideal hydro...
Tomas Kosek
(Charles University (CZ))
20/05/2014, 16:30
Jets
Poster
Jets produced in heavy-ion collisions are one of the important hard
probes that provide information about the hot and dense medium created
in heavy ion collisions. The performance of the jet reconstruction is
of great importance since it provides basis for each jet
measurement. Due to the large underlying background and its
fluctuations, the precise jet reconstruction is nontrivial...
Yongsun Kim
(Korea University (KR))
20/05/2014, 16:30
Jets
Poster
The fragmentation function and transverse momentum profile (shape) of inclusive jets in 2.76 TeV PbPb collisions are reported in this poster. Jets with transverse momentum $p_T$ > 100 GeV/c are measured using anti-$k_T$ algorithm with radius dR=0.3. Charged particles with p$_T$ > 1 GeV/c are used to investigate the fragmentation pattern. The pp collisions at the same center-of-mass energy...
Yan Zhu
(University of Santiago de Compostela)
20/05/2014, 16:30
Jets
Poster
Medium modification of γ-tagged jets and dijets in high-energy heavy-ion collisions is investigated within a Linearized Boltzmann Transport model for jet propagation that includes both elastic parton scattering and induced gluon emission. Inclusion of recoiled medium partons in the reconstruction of partonic jets is found to significantly reduce the net jet energy loss. Experimental data on...
Matthew Donald Steinpreis
(Ohio State University (US))
20/05/2014, 16:30
Correlations and Fluctuations
Poster
Identical kaon femtoscopic correlations allow one to measure the space-time characteristics of particle production using the combination of quantum statistics and final state interactions. Kaon femtoscopy provides an excellent complement to pion analyses as it extends the range over which we can study the momentum dependence of the femtoscopic radii and allows us to look for a transverse mass...
Andy Goldschmidt
(The Ohio State University)
20/05/2014, 16:30
Correlations and Fluctuations
Poster
Using event-by-event viscous fluid dynamics to evolve fluctuating initial density profiles for U+U collisions, we find a "knee"-like structure in the elliptic flow as a function of collision centrality, located around 0.5% centrality as measured by the final charged multiplicity. This knee is due to the preferential selection of tip-on-tip collision geometries by a high-multiplicity trigger....
Laszlo Csernai
(Department of Physics and Technology)
20/05/2014, 16:30
Collective Dynamics
Poster
Due to the low viscosity and strongly interacting QGP at high LHC energies flow fluctuations were observed up to the 8th flow harmonics. Similarly rotation, turbulence and even Kelvin-Helmholtz Instability were predicted and these may be observable by different methods. Apart of the usual flow harmonics analysis, other methods like two particle correlations, or particle polarizations may arise...
Hiroshi Ono
(University of Tsukuba)
20/05/2014, 16:30
Open Heavy Flavour and Quarkonia
Poster
As a consequence of the melting of quarkonia due to the color Debye screening in a hot medium, suppression of quarkonium yields is expected to be observed in the quark gluon plasma produced in relativistic heavy ion collision experiments at RHIC and LHC. In fact, suppression of the $J/\Psi$ yield has already been observed both at RHIC and LHC and thus theoretical understanding of charmonium...
Alessandro De Falco
(Universita e INFN (IT))
20/05/2014, 16:30
Thermodynamics and Hadron Chemistry
Poster
Light vector meson ($\rho$, $\omega$, $\phi$) production provides key information on
the hot and dense state of strongly interacting matter produced in high-energy
heavy-ion collisions. In particular, strangeness production can be accessed
through the measurement of the $\phi$ meson, while the measurement of the
$\rho$ spectral function can be used to reveal in-medium modifications of...
Dmytro Oliinychenko
(Frankfurt Institute for Advanced Studies, Germany; Bogolyubov Institute for Theoretical Physics. Kiev, Ukraine)
20/05/2014, 16:30
Collective Dynamics
Poster
Hybrid approaches are very successful in describing the dynamics of heavy ions collisions. The hot and dense medium is described well by fluid dynamic calculations whereas hadron transport accounts for particle rescatterings in the late stages of the reaction. The application of fluid dynamics requires rapid thermalization of the system. How and whether it is reached remains debatable. In this...
Zhenyu Chen
(Rice University (US))
20/05/2014, 16:30
Correlations and Fluctuations
Poster
Measurements of two-particle correlations with identified K^0_s and Lambda trigger particles in 5.02 TeV pPb and 2.76 TeV PbPb collisions are presented. One unique feature of this analysis is the implementation of a high-multiplicity trigger during the 2013 LHC pPb run, which enables the correlation studies to be performed up to a multiplicity range that is comparable to mid-central PbPb...
Kunsu Oh
(Pusan National University (KR))
20/05/2014, 16:30
Open Heavy Flavour and Quarkonia
Poster
Particles containing heavy quarks are very useful tool to investigate the properties of hot and dense matter produced in early stage of the relativistic heavy ion collision in terms of the mechanisms of their interaction with nuclear matter. This can be studied by non-photonic electrons (NPE) coming from semi-leptonic decays of heavy flavor hadrons. In year 2010, STAR has collected a large...
Dr
Murad Sarsour
(Georgia State University)
20/05/2014, 16:30
Initial State Physics
Poster
Low mass vector meson ($\omega$, $\rho$, and $\phi$) production in high-energy heavy-ion collisions provides key information on the hot and dense state of the strongly interacting matter produced in such collisions. They are sensitive to the medium-induced effects such as strangeness enhancement, modification of the resonance line shapes and their relative production rates in leptonic and...
Dr
Raphael Tieulent
(Universite Claude Bernard-Lyon I (FR))
20/05/2014, 16:30
Initial State Physics
Poster
Low mass vector mesons ($\rho$, $\omega$, $\phi$) provide important information on the hot and dense state of strongly interacting matter produced in heavy ion collisions. Among them, strangeness enhancement, a phenomenon associated with soft particles in the bulk matter, can be accessed through the measurement of the ratio $\phi$/($\rho+\omega$).
Low mass vector meson production in $p+p$...
Laure Marie Massacrier
(Laboratoire de Physique Subatomique et des Technologies Associe)
20/05/2014, 16:30
Open Heavy Flavour and Quarkonia
Poster
The aim of ultra-relativistic heavy-ion collisions is the study of nuclear matter at high temperature and pressure where quantum chromodynamics predicts the existence of a deconfined state of nuclear matter, the Quark-Gluon Plasma (QGP). Heavy quarks are expected to be produced in the initial partonic scatterings and interact with the deconfined medium making them ideal probes of the QGP....
Elena Lebedeva
20/05/2014, 16:30
Electromagnetic Probes
Poster
The Compressed Baryonic Matter (CBM) experiment is designed to investigate high baryon density matter at moderate temperatures in Au+Au collisions at 4-35A GeV beam energies.
Among the different observables, lepton pairs are particularly attractive, as they directly probe the entire space-time evolution of the expanding fireball formed in such collisions, escaping freely without...
Ioannis Bouras
(University of Frankfurt a.M.)
20/05/2014, 16:30
Collective Dynamics
Poster
The formation of Mach cones
is studied in a full $(3+1)$-dimensional setup of ultrarelativistic
heavy-ion collisions, considering a transverse and longitudinal
expanding medium at RHIC energies.
For smooth initial conditions and central collisions
the jet-medium interaction is investigated using high-energy
jets and various values of the shear
viscosity over entropy density ratio,...
Sumit Basu
(Department of Atomic Energy (IN))
20/05/2014, 16:30
Correlations and Fluctuations
Poster
Heavy-ion collisions at relativistic
energies, which are accessible at the Relativistic Heavy Ion
Collider (RHIC) and the Large Hadron Collider (LHC), are often
referred to as little bangs.
Experiments at these energies probe the conditions which
prevail at freeze-out, and often it is not possible to
define the correct equation-of-state (EoS) and the conditions
at the initial stages...
Yukinao Akamatsu
(Nagoya University)
20/05/2014, 16:30
Open Heavy Flavour and Quarkonia
Poster
Understanding the quantum dynamics of quarkonia is essential in the description of bottomonia and charmonia in the quark-gluon plasma. So far, it has been quite naively assumed that their dynamics can be described by the Schrödinger equation with in-medium, screened potential. Such a naïve approach is not correct anymore, in particular if one wants to study their time-evolution. After the...
Mikhail Malaev
(B.P. Konstantinov Petersburg Nuclear Physics Institute - PNPI ()
20/05/2014, 16:30
QCD at High Temperature and/or Density
Poster
Measurements of hadron spectra in proton-proton and nucleus-nucleus collisions at the LHC provide the means to study the mechanisms of particle production and properties of the medium formed in relativistic heavy ion collisions. The $\phi$ meson is a very rich probe since it is sensitive to several aspects of the collision such as strangeness enhancement, chiral symmetry restoration and parton...
Davide Caffarri
(CERN)
20/05/2014, 16:30
Open Heavy Flavour and Quarkonia
Poster
The ALICE experiment at the LHC studies ultra-relativistic Pb-Pb
collisions with the aim of investigating the properties of the
high-density state of strongly-interacting matter, expected to be
produced in heavy-ion collisions.
Heavy quarks are sensitive probes of the medium properties, since they
are formed on a shorter time scale with respect to the medium.
The elliptic flow...
Dr
Renu Bala
(University of Jammu (IN))
20/05/2014, 16:30
Open Heavy Flavour and Quarkonia
Poster
Heavy quarks (charm and beauty) are effective probes to investigate the properties of hot and dense QCD matter created in heavy-ion
collisions as they are produced in partonic scattering processes occuring in the early stages of the collision. Due to their long life time, they probe all the stages of the medium evolution and they interact with it losing energy via gluon radiation and...
Andrea Dubla
(University of Utrecht (NL))
20/05/2014, 16:30
Open Heavy Flavour and Quarkonia
Poster
In high-energy heavy-ion collisions, heavy quarks, i.e. charm and beauty, are mainly produced in hard scattering processes in the early stages of the collisions. Therefore they allow one to probe the properties of the deconfined state of strongly-interacting matter formed in such collisions, the Quark-Gluon Plasma (QGP).
A parton going through the hot and dense medium can lose energy via both...
Min Jung Kweon
(Inha University (KR))
20/05/2014, 16:30
Open Heavy Flavour and Quarkonia
Poster
Heavy-flavour hadrons, containing charm or beauty quarks, are expected to be probes providing constraints on partonic energy-loss mechanisms in the medium produced in heavy-ion collisions since they are produced at an early stage in the initial hard scattering processes. In particular, the medium-induced parton energy loss is expected to depend on the parton mass and colour charge. This...
Jan Wagner
(GSI - Helmholtzzentrum fur Schwerionenforschung GmbH (DE))
20/05/2014, 16:30
Open Heavy Flavour and Quarkonia
Poster
The characterisation of the Quark-Gluon Plasma (QGP), the deconfined state of strongly-interacting matter produced in high-energy heavy-ion collisions, is the main purpose of ALICE at the LHC. Because of their large masses, charm and beauty quarks are mostly produced in initial hard partonic interactions and thus can be used to probe the medium created in such collisions. The $p_{\rm T}$...
Ruchi Chudasama
(Bhabha Atomic Research Centre (IN))
20/05/2014, 16:30
Open Heavy Flavour and Quarkonia
Poster
Results on exclusive photoproduction of $\Upsilon$ states in ultra-peripheral collisions (UPC) of protons and ions at CMS are presented, which provides a clean probe of the gluon distribution at small values of parton fractional momenta $x~10^{-4}-10^{-3}$. The three $\Upsilon$ states (1S, 2S, 3S) are measured in the dimuon decay channel, on top of the photon-photon $ \rightarrow$ $\mu\mu$ QED...
Cristiane Jahnke
(Universidade de Sao Paulo (BR))
20/05/2014, 16:30
Open Heavy Flavour and Quarkonia
Poster
The Quark-Gluon Plasma (QGP) is a high-density state of strongly-interacting matter in which partons are deconfined. This state of matter can be studied experimentally via heavy-ion collisions where the critical temperature and density for the phase transition to the QGP can be attained. Measurements of heavy-flavour (charm and beauty) production in these collisions are of particular...
Anju Bhasin
(University of Jammu (IN))
20/05/2014, 16:30
Collective Dynamics
Poster
One of the main goal of the STAR experiment at Relativistic Heavy Ion Collider (RHIC) is to study the properties of hot and dense matter created in the collision of two heavy nuclei [1]. The higher harmonics of azimuthal anisotropy $v_{n}$ of produced particles are believed to be a sensitive way to characterize the system created in the heavy-ion collision [2,3]. Moreover higher harmonics of...
Roberto Preghenella
(Universita e INFN (IT))
20/05/2014, 16:30
Thermodynamics and Hadron Chemistry
Poster
After the successful completion of the first LHC run, a complete dataset of light flavor particles in three collision systems (pp, p-Pb, Pb-Pb) is available for detailed comparisons with thermal model descriptions. These models have been successful in describing particle production in heavy-ion collisions at RHIC and SPS energies. The evolution of particle yields and ratios from RHIC to LHC...
Mr
Jeff Klatsky
(PHENIX)
20/05/2014, 16:30
Open Heavy Flavour and Quarkonia
Poster
For many years it has been expected that the suppression of J/$\psi$ production in heavy ion collisions can provide some insight into conditions inside the deconfined Quark Gluon Plasma (QGP). A measurement of J/$\psi$ di-electron decays at midrapidity is particularly desirable for providing insight on quarkonium formation in the plasma since cold nuclear matter effects are smaller there than...
Patrick Simon Reichelt
(Johann-Wolfgang-Goethe Univ. (DE))
20/05/2014, 16:30
Electromagnetic Probes
Poster
The measurement of electron-positron pairs (dielectrons) in the low invariant mass region allows to study the vacuum and in-medium properties of light vector mesons. Additionally, low-mass dielectrons are produced by internal conversion of virtual direct photons that are emitted during the evolution of ultra-relativistic heavy-ion collisions. They are excellent direct probes to study all...
Theo Alexander Broker
(Johann-Wolfgang-Goethe Univ. (DE))
20/05/2014, 16:30
Electromagnetic Probes
Poster
Low-mass dielectrons are an important probe for the hot and dense medium which is created in ultra relativistic heavy-ion collisions. Since leptons do not interact strongly, they carry information from all collision stages with negligible final state interaction. While pp collisions provide a reference measurement for a medium-free environment, the impact of cold nuclear matter effects on the...
Baldo Sahlmuller
(Johann-Wolfgang-Goethe Univ. (DE))
20/05/2014, 16:30
Jets
Poster
One of the physics observables measured with the ALICE Electromagnetic Calorimeter (EMCal) are neutral mesons such as $\pi^0$ and $\eta$ that are reconstructed through their two-photon decay. The EMCal offers a complementary method to the neutral meson measurement with the ALICE tracking system and the PHOS spectrometer. High $p_{\rm T}$ neutral mesons are used to study the modifications of...
Pedro Gonzalez Zamora
(Centro de Investigaciones Energ. Medioambientales y Tecn. - (ES)
20/05/2014, 16:30
Jets
Poster
The study of neutral meson production in p-Pb collisions is of importance to confirm that the strong suppression
observed in central Pb-Pb collisions is a final-state effect of the produced dense medium. Furthermore the neutral
pion production is essential for the extraction of the direct photon spectra, as it is the main source of background for
direct photons.
ALICE measures neutral...
Annalisa Mastroserio
(Universita e INFN (IT))
20/05/2014, 16:30
Open Heavy Flavour and Quarkonia
Poster
The ALICE experiment at CERN is one of the main LHC experiments and it
is dedicated to study the quark-gluon plasma. It is the only experiment that measures
the charmonium production at central rapidities ($|y| < 0.9$) down to transverse
momenta $p_{\rm T} = 0$ GeV/$c$ in pp, p-Pb, and Pb-Pb collisions. In particular the charmonium state
is detected at midrapidity via its e$^+$e$^-$...
Chris G Yaldo
(Wayne State University (US))
20/05/2014, 16:30
Jets
Poster
Proton-nucleus collisions are utilized to distinguish between initial and final state effects, which is vital for establishing a baseline for heavy-ion collisions. One of the crucial reference measurements is the jet nuclear modification factor ($R_{\rm pPb}$) in p-Pb collisions at $\sqrt{s_{\rm NN}} = 5.02$ TeV at the LHC.
Jets in ALICE are reconstructed using the anti-k$_{\rm T}$ jet...
Grazia Luparello
(Universita e INFN (IT))
20/05/2014, 16:30
Open Heavy Flavour and Quarkonia
Poster
At the beginning of 2013, p-Pb collisions at the centre-of-mass energy of 5.02 TeV per nucleon pair have been recorded with ALICE at the LHC. The analysis of D-meson production in p-Pb collisions can provide information on how much the heavy-flavour production in nuclear collisions is influenced by cold nuclear matter effects, such as the nuclear modification of the parton distribution...
Gary Westfall
(Michigan State University)
20/05/2014, 16:30
Correlations and Fluctuations
Poster
The balance function, which measures the correlations between opposite sign charge pairs, is sensitive to the mechanisms of charge formation and the subsequent relative diffusion of the balancing charges. The study of the balance function can provide information about charge creation times as well as the subsequent collective behavior of particles. We present charge balance functions in terms...
Dr
Gabor Veres
(CERN)
20/05/2014, 16:30
Initial State Physics
Poster
Total cross sections in pp, p$\bar{\rm p}$, ep collisions at high energies have been described in terms of pomeron exchange. Their increase with energy depends on the parton evolution mechanism. Proton-nucleus cross sections have so far only been measured in fixed-target or cosmic-ray experiments. CMS has measured the total inelastic proton-lead cross-section by detecting activity in the...
Nuggehalli Ajitanand
(SUNY Stony Brook)
20/05/2014, 16:30
Correlations and Fluctuations
Poster
The recent observation of azimuthal correlations in p+Pb collisions at LHC
is consistent with an interpretation as either an initial state gluon saturation effect or the expansion dynamics of a QGP like medium. It is well known that the latter process is characterized by strong final state re-scattering effects. In this work two-pion interferometry measurements in d+Au and Au+Au collisions...
Rosi Jan Reed
(Yale University (US))
20/05/2014, 16:30
Jets
Poster
In relativistic heavy-ion collisions a hot, dense medium of strongly interacting matter called the Quark-Gluon Plasma (QGP) is formed. It has been determined that jets of hadrons, created from the fragmentation of hard-scattered partons, are suppressed relative to measurements from proton-proton collisions. This jet quenching effect in both strong and weak coupling calculations explicitly...
Mrs
Olga Rusnakova
(Czech Technical University in Prague)
20/05/2014, 16:30
Open Heavy Flavour and Quarkonia
Poster
Heavy quarks, primarily produced in initial hard scattering processes at the Relativistic Heavy Ion Collider (RHIC), are important tools for understanding the properties of the Quark-Gluon Plasma (QGP). The heavy quark interaction with the QGP can be studied through non-photonic electrons (NPE), which are produced from semi-leptonic decays of heavy flavor mesons. In $p+p$ collisions...
Elienos Pereira De Oliveira Filho
(Universidade de Sao Paulo (BR))
20/05/2014, 16:30
Open Heavy Flavour and Quarkonia
Poster
The aim of relativistic heavy-ion collisions is to investigate the properties of the Quark-Gluon Plasma (QGP), a deconfined state of strongly-interacting matter. The characterisation of the QGP via the measurements of several observables is the main purpose of the ALICE detector at the CERN LHC.
Heavy quarks, i.e. charm and beauty, are a very useful tool in this context. Due to their large...
Mrs
Sukanya Mitra
(Variable Energy Cyclotron Centre)
20/05/2014, 16:30
Collective Dynamics
Poster
The shear and bulk viscosities, as well as the thermal conductivity of a pion gas are obtained by solving the relativistic transport equation in the Chapman-Enskog approximation at finite temperature with a finite chemical potential. Instead of estimating the scattering amplitute from the lowest order Lagrangian of chiral perturbation theory used in most of the literature, we have modelled...
Mr
Yasuki Tachibana
(The University of Tokyo)
20/05/2014, 16:30
Jets
Poster
We develop a fully (3+1)-dimensional relativistic hydrodynamic model with source terms to analyze large angle emission of low-$p_{T}$ particles in asymmetric di-jet events. In Pb-Pb collision experiments at LHC, a large number of low-$p_{T}$ hadrons at large angles from a sub-leading jet is observed in asymmetric di-jet events by the CMS Collaboration [1]. The total transverse momentum of the...
Khaled Teilab
(Institut für Theoretische Physik - Universität Frankfurt)
20/05/2014, 16:30
Electromagnetic Probes
Poster
We study the production of mesons in nucleon-nucleon
reactions at center-of-mass momenta of a few GeV using an $N_f=2$
linear sigma model, extended by including the $N_f=2$ multiplets
of (pseudo-) scalar and (axial-) vector mesons and a doublet of
the nucleon together with its chiral partner (the $N^*(1535)$ or
$N^*(1650)$ resonance).
Cross sections for the production of $\pi-$,...
Dr
Ananta P. Mishra
(Physical Research Laboratory, Ahmedabad)
20/05/2014, 16:30
QCD at High Temperature and/or Density
Poster
We study the meta-stable states in high temperature phase of QCD characterised by nonzero expectation values for the imaginary part of the Polyakov loop. We consider $N_f= 2, 3$ dynamical staggered quarks, and carry out simulations at various values of the coupling $\beta$ to observe these states. In particular, we find the value of the coupling ($\beta_m$) above which the meta-stable states...
Michal Meres
(Comenius University (SK))
20/05/2014, 16:30
Thermodynamics and Hadron Chemistry
Poster
The ALICE Experiment features low material budget and high resolution tracking, which allow for precise measurements of charged particle production. The measurement of the antibaryon-to-baryon ratios ($\overline{\rm{B}}$/B), in particular, probes the baryon transport and degree of baryon stopping in high energy interactions, providing insight into the collision dynamics and the structure of...
Emilia Leogrande
(University of Utrecht (NL))
20/05/2014, 16:30
Correlations and Fluctuations
Poster
Two-particle angular correlations between unidentified charged trigger and associated particles are measured by the ALICE detector in pp collisions at a centre of mass energy of $0.9$, $2.76$, $7$ TeV and in p-Pb collisions at a nucleon-nucleon centre of mass energy of $5.02$ TeV. The particle correlations are expressed as an associated yield per trigger particle in the transverse-momentum...
Sandeep Chatterjee
(National Institute of Science Education and Research)
20/05/2014, 16:30
Thermodynamics and Hadron Chemistry
Poster
We argue that known systematics of hadron cross sections may cause different particles to freeze out of the fireball produced in heavy-ion collisions at different times. We find that a simple model with two freezeout points is a better description of data on hadron yields than that with a single freezeout, while still remaining predictive. The resulting fits seem to present constraints on the...
Karoly Uermoessy
(Hungarian Academy of Sciences (HU))
20/05/2014, 16:30
New Theoretical Developments
Poster
Fragmentation functions measured in e+e- and pp collisions are well reproduced via a fragmentation model based on microcanonical statistics and superimposed Euler--Gamma-type multiplicity fluctuations [1,2]. The power of the obtained analytic fragmentation function (which is a cut-power function in x) developes a double-logarithmic dependence on the QCD scale Q^2 [3]. Besides, this function...
Jeremy Wilkinson
(Ruprecht-Karls-Universitaet Heidelberg (DE))
20/05/2014, 16:30
Open Heavy Flavour and Quarkonia
Poster
ALICE's heavy-ion programme is dedicated to the study of the hot, high-density state of matter formed in high-energy nuclear collisions. One of the many probes at its disposal is the production of heavy quarks, namely charm and beauty, since due to their large masses they are produced in the earliest stages of the collision and experience the full evolution of the system. As well as studying...
Jihyun Bhom
(University of Tsukuba (JP))
20/05/2014, 16:30
Correlations and Fluctuations
Poster
Previously observed ridge-like structures in high-energy heavy-ion collisions has mostly been explained by event anisotropy of the initial geometrical distribution of participants, followed by collective expansion. Fluctuations of the initial geometry are known to become more and more significant in peripheral collisions, while the collective expansion should become stronger in semi-central to...
Sangwook Ryu
(McGill University)
20/05/2014, 16:30
Jets
Poster
We present our improved event generator for heavy ion collisions which combines MUSIC, MARTINI and
UrQMD.
This combines hydrodynamic evolution QGP starting with the IP-Glasma and MC-Glauber initial
conditions (MUSIC),
jet production and propagation through the evolving medium (MARTINI) and the final hadronic
interactions of the bulk and jet particles
using the UrQMD. The result is...
Annika Passfeld
(Westfaelische Wilhelms-Universitaet Muenster (DE))
20/05/2014, 16:30
Jets
Poster
The measurement of particle production in p-Pb collisions at high LHC energies allows the study of fundamental properties of quantum chromodynamics (QCD) at low parton momentum fraction $x$ and high gluon densities.
Moreover it is important as reference for heavy ion collisions. It can show whether the initial state of the colliding nuclei plays a role in the observed suppression of hadron...
Jason Adrian Kamin
(Johann-Wolfgang-Goethe Univ. (DE))
20/05/2014, 16:30
Jets
Poster
Light neutral mesons are among the most plentiful particles produced
at the LHC and therefore serve as an ideal testing ground for pQCD in
both pp and A-A collisions. Additionally, they provide a critical
foundation upon which other analyses (direct photon, dilepton, etc)
base their background determination. The nuclear modification factor
$R_{\mathrm{AA}}$ shows a dramatic suppression...
Prof.
Kyoichiro Ozawa
(KEK)
20/05/2014, 16:30
Future Experimental Facilities, Upgrades, and Instrumentation
Poster
A new beam line is under construction at the Hadron Experimental Facility of the Japan Proton Accelerator Research Complex (J-PARC). Details of the beam line and proposed experiments using the beam line are reported in this talk.
A new beam line will deliver a primary 30 GeV proton beam and a secondary produced un-separated hadron (mainly pion) beam. Intensities of the beams are $10^10$ Hz...
Amaresh Jaiswal
(Tata Institute of Fundamental Research),
Rajeev Bhalerao
(Tata Institute of Fundamental Research),
Sreekanth V.
(Tata Institute of Fundamental Research),
Subrata Pal
(Tata Institute of Fundamental Research)
20/05/2014, 16:30
New Theoretical Developments
Poster
We derive relativistic viscous hydrodynamic equations for various
forms of the non-equilibrium single-particle phase-space distribution
function $f(x,p)$, and apply these results to relativistic heavy-ion
collisions at the RHIC and LHC energies.
In the first part of this work, we derive hydrodynamic equations
invoking the generalized second law of thermodynamics for two
different forms...
Emil Aleksander Kaptur
(University of Silesia (PL))
20/05/2014, 16:30
QCD Phase Diagram
Poster
The NA61/SHINE experiment performs a detailed study
of the onset of deconfinement and search for critical point
of strongly interacting matter by colliding nuclei
of different sizes (protons, Be, Ar, Xe and Pb) at various
beam momenta in the SPS energy range.
The study of the onset of deconfinement is carried out by comparing inclusive hadron spectra from the recent Be+Be data taking...
Tobiasz Czopowicz
(Warsaw University of Technology (PL))
20/05/2014, 16:30
QCD Phase Diagram
Poster
The NA61/SHINE experiment aims to discover the critical point of strongly interacting matter and study the properties of the onset of deconfinement. These goals are to be achieved by performing a two dimensional phase diagram ($T$-$\mu_B$) scan by measurements of hadron production properties in proton-proton, proton-nucleus and nucleus-nucleus interactions as a function of collision energy and...
Matthias Hempel
(Basel University)
20/05/2014, 16:30
QCD Phase Diagram
Poster
First-order phase transitions (PTs) with more than one globally conserved charge, so-called noncongruent PTs, have characteristic differences compared to congruent PTs (e.g., dimensionality of phase diagrams and location and properties of critical points and end points). In this talk we investigate the noncongruence of the deconfinement PT and compare it with the nuclear liquid-gas PT at...
Dr
Mohamed Abdel-Aziz
(Ain Shams University)
20/05/2014, 16:30
Approach to Equilibrium
Poster
We developed a nonextensive quark recombination model to study the matter created in relativistic heavy ion collisions. We use the temperature, flow velocity and the nonextensive parameter q as our model parameters. To study the collisions energy and centrality dependance of our model parameters, we fit the transverse momentum spectra of different hadrons at RHIC and LHC. Comparison between...
Hugo Marrochio
(U)
20/05/2014, 16:30
New Theoretical Developments
Poster
In this work we study wave propagation in dissipative relativistic fluids described by a simplified set of the conformal 2nd order hydrodynamic equations.
Small amplitude waves are studied within the linearization approximation while waves with larger amplitude, which are described by nonlinear wave equations, are investigated using the reductive perturbation method. Our results indicate the...
Dr
Binoy Krishna Patra
(Indian Institute of Technology Roorkee)
20/05/2014, 16:30
Open Heavy Flavour and Quarkonia
Poster
We have investigated the properties of quarkonia in a complex potential which is obtained by the in-medium corrections to both the perturbative and nonperturbative term in the potential through the dielectric function in real-time formalism. In isotropic medium, the real-part of the potential becomes stronger
and thus makes the quarkonia more bound whereas the (magnitude)
imaginary-part too...
Dr
Markus Huber
(KFU Graz)
20/05/2014, 16:30
New Theoretical Developments
Poster
The correlation functions of QCD are the fundamental building blocks for hadron phenomenology and strong-interaction matter studies based on functional continuum methods. A better understanding of these correlations from first principles constrains the input of more phenomenological studies. Here, we report on the first self-consistent solution of the Dyson-Schwinger equation (DSE) for the...
Guilherme Teixeira De Almeida Milhano
(Universidade de Santiago de Compostela (ES)),
Liliana Marisa Cunha Apolinario
(Universidade de Santiago de Compostela (ES)),
Mateusz Ploskon
(Lawrence Berkeley National Lab. (US)),
Xiaoming Zhang
(Lawrence Berkeley National Lab. (US))
20/05/2014, 16:30
Jets
Poster
At present jet quenching observations rely on samples that contain a mixture of quenched and unquenched jets. Modifications of the structure of jets due to quenching are explored by considering jet sub-structure in event generators: MC PYTHIA (vacuum jets) and Q-PYTHIA (in-medium modified jets). Subjet observables are defined in collinear and infrared safe algorithms and tested for exprimental...
Mr
Matthias Drews
(TUM, Munich)
20/05/2014, 16:30
QCD Phase Diagram
Poster
We study a chiral nucleon-meson model, which turns out to be perfectly suited to analyze both the thermodynamics of nuclear matter and chiral symmetry breaking. The model is extended by a self-consistent treatment of fluctuations with methods of the functional renormalization group. The results are in good agreement with thermodynamical calculations in the framework of in-medium chiral...
Stefania Bufalino
(Universita e INFN (IT))
20/05/2014, 16:30
Future Experimental Facilities, Upgrades, and Instrumentation
Poster
One of the striking features of particle production in Pb-Pb collisions at high energies is the near equal
abundance of matter and antimatter in the central rapidity region.
The comparison of the production of light nuclei, antinuclei, hypernuclei and anti--hypernuclei at high energies
offers a unique opportunity to understand if the mechanism of particle production in ultra-relativistic...
Jeffery Mitchell
(Brookhaven National Laboratory)
20/05/2014, 16:30
QCD Phase Diagram
Poster
The dependence of charged particle production and transverse energy production in relativistic heavy ion collisions has been comprehensively studied as a function of $\sqrt{s_{NN}}$ from 7.7 to 200 GeV and centrality represented as the average number of nucleon participants, $\langle N_{part} \rangle$, in the collision. The general trend of the data exhibits a decrease in the value of...
Prof.
Volodymyr Magas
(University of Barcelona)
20/05/2014, 16:30
Collective Dynamics
Poster
The hydrodynamic simulations of the ultra-relativistic heavy ion collisions are very successful in describing these reactions, as it is confirmed by the latest RHIC and LHC data. Hydrodynamic simulation does not only mean a certain algorithm of solving the equations of relativistic hydrodynamics; it is also based on a specific initial state, specific EoS, and specific freeze out...
Rosa Romita
(University of Liverpool (GB))
20/05/2014, 16:30
Future Experimental Facilities, Upgrades, and Instrumentation
Poster
ALICE is the LHC experiment dedicated to the study of the Quark-Gluon Plasma (QGP) in Pb-Pb collisions. Heavy quarks are very powerful probes to explore the QGP formation and its properties, since they are abundantly produced at LHC energies and they experience the entire evolution of the medium.
The measurement of the $\Lambda_{c}$ yield relative to D mesons in Pb-Pb collisions would address...
Prof.
Kyrill Bugaev
(Bogolyubov Institute for Theoretical Physics of NAS of Ukraine, Kiev, Ukraine)
20/05/2014, 16:30
Thermodynamics and Hadron Chemistry
Poster
\noindent
We performed a thorough analysis of two alternative approaches to treat the chemical freeze-out of strange particles in hadron resonance gas model with the multicomponent hard-core repulsion [1].
The first approach accounts for their chemical non-equilibrium via the usual $\gamma_s$ factor and such a model describes the hadron multiplicities measured in nucleus-nucleus collisions...
Dr
Valery Lyuboshitz
(Joint Institute for Nuclear Research ( Dubna ))
20/05/2014, 16:30
Correlations and Fluctuations
Poster
The comparative theoretical analysis of pair correlations of two neutral $K$ mesons and two neutral heavy mesons ( $D, B, B_s$ ), generated in inclusive
processes -- hadron-hadron, hadron--nucleus and nucleus--nucleus collisions -- with strangeness and charm ( beauty ) conservation, is performed . For $K^0$ mesons, relations describing the dependence of the correlations of two short-lived...
Dr
Leonard Fister
(IPhT, CEA Saclay)
20/05/2014, 16:30
QCD Phase Diagram
Poster
We discuss the phase structure of QCD at zero and non-vanishing temperature and density. The focus is on the deconfinement phase transition and, in particular, the thermodynamics of QCD close to criticality. The precise understanding of equilibrium physics allows to also compute temperature-dependent transport coefficients. For the ratio of shear viscosity over entropy we find a minimum close...
Dr
Volodymyr Konchakovski
(Institute for Theoretical Physics, Giessen University)
20/05/2014, 16:30
Initial State Physics
Poster
The Parton-Hadron-String-Dynamics (PHSD) transport model is employed for p+Pb collisions at $\sqrt{s_{NN}}$ = 5.02 TeV and compared to recent experimental data from the LHC as well as to alternative models. We focus on the question of initial state dynamics, i.e. if the initial state might be approximated by a superposition of independent nucleon-nucleon collisions or should be considered as a...
Benjamin Andreas Hess
(Eberhard-Karls-Universitaet Tuebingen (DE))
20/05/2014, 16:30
Jets
Poster
Jets provide experimental access to identify cascades of consecutive emission of partons from an initial hard QCD scattering.
The process of parton showering and subsequent hadronisation is broadly known as
fragmentation.
Identified final state particles provide an enhanced sensitivity to the flavour dependence of fragmentation.
The $\mbox{ALICE}$ detector at the LHC has excellent...
Prof.
Jamal Jalilian-Marian
(Baruch College)
20/05/2014, 16:30
Jets
Poster
We investigate the effect of parton energy loss on 3-jet events in high energy gold-gold and lead-lead collisions at RHIC and the LHC. We study the azimuthal angular distribution of the 3-jet events for various energy loss models and for different energy loss parameters. It is shown that 3-jet events have more discriminating power than single and double inclusive jets and are a more precise...
Gian Michele Innocenti
(Massachusetts Inst. of Technology (US))
20/05/2014, 16:30
Open Heavy Flavour and Quarkonia
Poster
B meson reconstruction is of great interest in the heavy ion collisions. Measurement of B meson pseudorapidity and transverse momentum spectra can provide useful inputs for the study flavor dependence of jet quenching in PbPb collisions and for the determination of the heavy flavor nuclear parton distribution functions in pPb collisions. The performance of excusive B meson reconstruction with...
Cristina Terrevoli
(Universita e INFN (IT))
20/05/2014, 16:30
Future Experimental Facilities, Upgrades, and Instrumentation
Poster
The ALICE detector is designed to investigate the properties of the hot and dense plasma of quarks and gluons,
formed at the extreme energy densities reached in Pb-Pb collisions at the LHC.
Heavy quarks are sensitive probes of this medium, because they are produced at the initial stage of the collision and they subsequently
interact with the medium itself.
In particular, an accurate...
Johannes Hendrik Stiller
(Ruprecht-Karls-Universitaet Heidelberg (DE))
20/05/2014, 16:30
Future Experimental Facilities, Upgrades, and Instrumentation
Poster
The installation of an upgraded Inner Tracking System (ITS) in the ALICE central barrel is planned during the second long shutdown of the LHC in 2019. The design of the new ITS presents 7 layers of silicon pixel detectors, starting from a radius of 2.24 cm from the beam line. The single hit resolution will be of about 4 $\mu$m and the material thickness will be as low as 0.3% of the radiation...
Leo Yu
(Rutgers, State Univ. of New Jersey (US))
20/05/2014, 16:30
Jets
Poster
Jets associated with the production of bottom quarks in pp, ppb and PbPb collisions are identified by a variety of algorithms developed by CMS. These algorithms exploit the long lifetime and high mass of bottom quarks by using the impact parameters of charged-particle tracks, the properties of reconstructed decay vertices and the presence of a lepton or combinations of these quantities. In...
Raghav Kunnawalkam Elayavalli
(Rutgers, State Univ. of New Jersey (US))
20/05/2014, 16:30
Jets
Poster
This poster presents the optimized techniques used to reconstruct inclusive jets in pp, pPb and PbPb collisions collected by the CMS detector. Jets are reconstructed using anti-$k_T$ sequential reconstruction algorithm on particle flow objects. Underlying event energy is estimated by various background subtraction techniques and their systematic uncertainties are studied. The events collected...
Mr
Kazuya Nagashima
(Hiroshima University)
20/05/2014, 16:30
Future Experimental Facilities, Upgrades, and Instrumentation
Poster
We will present our ongoing study of performance for measurement of jets and heavy flavors at the sPHENIX project using a Geant4 simulation.
The sPHENIX is the planned/anticipated upgrade of the PHENIX detector at RHIC.
The physics programs of sPHENIX primarily aim at jets and heavy flavors.
The program can be much enhanced with the preshower and the EMCal that provides separation of...
Dr
Debasish Das
(Saha Institute of Nuclear Physics (IN))
20/05/2014, 16:30
Open Heavy Flavour and Quarkonia
Poster
The study of the production of bottomonium states
and their suppression has been a proposed probe of the properties of
the hot and dense medium created in high-energy heavy-ion collisions.
In particular, some of the $\Upsilon$ states have a smaller size
and larger binding energy than the J/$\psi$, and their
study provides valuable information complementary
to those obtained from...
Akira Ohnishi
(Kyoto University), Mr
Terukazu Ichihara
(Kyoto University)
20/05/2014, 16:30
QCD Phase Diagram
Poster
We study the QCD phase diagram in the strong coupling region by using the auxiliary field Monte-Carlo method. Elucidating the phase diagram structure in QCD is a big challenge. The strong coupling lattice QCD is a promising machinery, in which the effective action is obtained by integrating the link variables analytically at a given order of the strong coupling expansion, then the sign problem...
Mario Mitter
(Univ. Heidelberg)
20/05/2014, 16:30
QCD Phase Diagram
Poster
The thermodynamics of the finite temperature QCD crossover is investigated with a low-energy effective description. The resulting pressure and trace anomaly are in very good agreement with corresponding results from lattice Monte-Carlo simulations. Effects of the chiral anomaly on the phase structure are explored and results for the temperature dependence of the anomalously large mass of the...
Yorito Yamaguchi
(University of Tokyo)
20/05/2014, 16:30
Initial State Physics
Poster
A dark photon is a hypothetical particle which is very weakly coupled
with ordinary photons in some Beyond the Standard Model (BSM)
theories. The dark photon is a candidate for the annihilation of dark
matter particles into $e^+e^-$ pairs, a process which could provide an
explanation for the positron excess in the universe observed by
several satellite experiments. It may also explain...
Dr
Olena Linnyk
(University of Giessen)
20/05/2014, 16:30
Electromagnetic Probes
Poster
The QCD matter produced initially in ultra-relativistic nucleus-nucleus collisions is expected to represent a high temperature plasma, which should be evidenced in its electromagnetic radiation. We analyze the production of real and virtual photons from the strongly-coupled QGP in the initial stages of the collisions as well as the ('corona') radiation from the interacting mesons and baryons...
Lukasz Kamil Graczykowski
(Warsaw University of Technology (PL))
20/05/2014, 16:30
Correlations and Fluctuations
Poster
The size of the particle emitting region at freeze-out obtained with
femtoscopy is an important characteristic of heavy-ion collisions.
Such a measurement for identical pions (sometimes called "HBT") provides
a detailed picture of the system size and its dependence on pair
transverse momentum and multiplicity.
The A-A pion femtoscopy results are interpreted in the hydrodynamic...
Ms
Katarzyna Poniatowska
(Warsaw University of Technology)
20/05/2014, 16:30
Correlations and Fluctuations
Poster
The main task of the Beam Energy Scan (BES) program at RHIC is to scan the QCD phase diagram with heavy-ion Au+Au collisions ( sqrt(s_NN) = 7.7 - 62.4GeV ) to find signatures for the 1st order phase transition and the critical point. Femtoscopy analysis allows us to extract information about size of the emission source. In particular, from the non-identical particles correlations, e.g....
Dr
Valery Lyuboshitz
(Joint Institute for Nuclear Research, Dubna)
20/05/2014, 16:30
Correlations and Fluctuations
Poster
Spin correlations for the $\Lambda \Lambda$ and
$\Lambda \bar{\Lambda}$ pairs, generated in relativistic heavy ion collisions, and related angular correlations at the joint registration of hadronic decays of two hyperons, in which space parity is not conserved, are theoretically analyzed. The correlation tensor components can be derived from the double angular distribution of products of two...
Hideaki Iida
(Kyoto University)
20/05/2014, 16:30
Initial State Physics
Poster
The entropy production in the initial stage of relativistic heavy-ion
collision is studied based on the classical Yang-Mills dynamics in the
non-expanding plasma by constructing the corresponding (quantum) coherent state.
The decoherence entropy is calculated from the distribution of the
gluon occupation number given by the coherent state.
We find that the importance of the...
Mr
Md Nasim
(NISER, Bhubaneswar, India)
20/05/2014, 16:30
Collective Dynamics
Poster
One of the major goals of the heavy-ion experiments is to study the properties of hot and dense matter
created in the collision of two heavy
nuclei. Elliptic flow ($v_{2}$) of $\phi$ meson in Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV has provided a clear evidence for partonic collectivity[1]. This was possible because of the small hadronic interaction cross section and early freeze-out...
Prof.
Gennady Zinovjev
(National Academy of Sciences of Ukraine (UA))
20/05/2014, 16:30
Electromagnetic Probes
Poster
Intensive radiation of magnetic bremsstrahlung type (synchrotron
radiation) resulting from the interaction of escaping quarks with the
collective confining colour field is suggested as new possible
mechanism of experimentally observed direct photon anisotropy.
The polarization properties of such photons and the pecularities in
the angular asymmetry of radiated lepton pairs related to...
Mukund Madhav Varma
(Massachusetts Inst. of Technology (US))
20/05/2014, 16:30
Correlations and Fluctuations
Poster
The phi meson is a versatile probe for studying the hot medium created in heavy ion collisions. Its low hadronic interaction cross section can provide important insights into the early time dynamics of the collective expanding medium. In this analysis, the performance of phi meson reconstruction via the decay channel of K+K- is presented for high multiplicity events in 5.02 TeV pPb and 2.76...
Dr
Leonardo Tinti
(UJK)
20/05/2014, 16:30
Collective Dynamics
Poster
Successful applications of relativistic viscous hydrodynamics in the description of heavy-ion collisions at RHIC and the LHC triggered large interest in the development of the hydrodynamic framework. An example of the new approach to relativistic dissipative hydrodynamics is anisotropic hydrodynamics --- the framework where effects connected with the expected high pressure anisotropy of the...
Prof.
Neda Sadooghi
(Department of Physics, Sharif University of Technology, Tehran, Iran)
20/05/2014, 16:30
QCD at High Temperature and/or Density
Poster
The study of quark matter at extreme temperature and in the presence of very strong magnetic fields has attracted much attention over the past few years. There are evidences for the creation of very strong and short-living magnetic fields in the early stages of noncentral heavy ion collisions at RHIC and LHC. Depending on the collision energies and impact parameters, they are estimated to be...
Sarah La Pointe
(Universita e INFN (IT))
20/05/2014, 16:30
Open Heavy Flavour and Quarkonia
Poster
Heavy quarks, i.e. charm and beauty, are ideal probes of the QCD matter formed in relativistic heavy-ion collisions, as they are predominantly produced in the early stage of the collision via initial hard parton scatterings. While propagating through the dense matter, they lose energy through elastic scatterings and radiative processes. Theoretical models predict that the energy loss of...
Andrea Rossi
(CERN)
20/05/2014, 16:30
Open Heavy Flavour and Quarkonia
Poster
The ALICE Collaboration measured a significant suppression of the production of high transverse momentum ($p_{\rm T}$) electrons from heavy-flavour hadron decays at central rapidity in Pb-Pb collisions with respect to proton-proton collisions. This indicates that charm and beauty quarks interact significantly, losing energy, with the Quark Gluon Plasma (QGP) formed in heavy-ion collisions. The...
Antonio Uras
(Universite Claude Bernard-Lyon I (FR))
20/05/2014, 16:30
Open Heavy Flavour and Quarkonia
Poster
During the second long shutdown of the LHC in 2019 the ALICE detector will be improved with the installation of a new Muon Forward Tracker (MFT). This detector will crucially contribute to the precise characterization of the high-temperature, strongly-interacting medium created in ultra-relativistic Pb-Pb collisions at $\sqrt{s_\mathrm{NN}} = 5.5$ TeV. Covering the pseudo-rapidity range $2.5 <...
Georg Bergner
20/05/2014, 16:30
QCD at High Temperature and/or Density
Poster
Numerical simulations of QCD on the lattice is an essential tool for non-perturbative investigations at finite temperature. At finite density these investigations are hampered by the sign problem. A reformulation in terms of a Polyakov effective theory allows to circumvent this problem to a large extend. I will summarize the derivation of the effective action in terms of a spatial strong...
Rashmi Raniwala
(University of Rajasthan (IN))
20/05/2014, 16:30
QCD Phase Diagram
Poster
The STAR experiment at Relativistic Heavy Ion Collider (RHIC) has been studying the properties of the QCD matter at extremely high energy density and parton density, created in the heavy ion collisions. Photons are produced at all stages of the colliding system directly as well as through decay of produced particles like neutral pions. The multiplicity and pseudo-rapidity distribution of...
Dr
Sho Ozaki
(KEK)
20/05/2014, 16:30
QCD Phase Diagram
Poster
Motivated by the observation that non-central heavy-ion collisions in RHIC and LHC are accompanied by extremely strong magnetic fields, much attention has been paid to the QCD dynamics in strong electromagnetic fields. In particular, the change of vacuum properties such as quark condensates has been investigated in terms of both effective models and lattice simulations. While both of these...
Wolfgang Unger
(U)
20/05/2014, 16:30
QCD Phase Diagram
Poster
We compare two different approaches to strong coupling lattice QCD which are suited to study the phase diagram in the $\mu-T$ plane: The first is based on staggered fermions, the second is based on Wilson fermions. Since in both formulations the gauge links are integrated out analytically, the sign problem is much milder than in conventional lattice QCD. The resulting dual representation in...
Dr
Nils Strodthoff
(Universitaet Heidelberg)
20/05/2014, 16:30
Relations to Other Strongly Interacting Systems
Poster
QCD suffers from a sign problem which hampers Lattice Monte Carlo simulations at finite chemical potential. One way to circumvent this problem
in order to gain insights into the phase diagram of strongly interacting matter at finite density is to consider QCD-like theories where this problem is absent.
In this talk we will discuss the phase diagrams of two prototypical examples, 2-color QCD...
Mrs
Fu-Ming LIU
(CCNU, Wuhan)
20/05/2014, 16:30
Electromagnetic Probes
Poster
In this talk we investigate the information carried by the large elliptic flow of direct photons, observed at RHIC and LHC, in the frame work of (3+1)-dimensional ideal hydrodynamical model constrained with hadronic data.
It is found that the transverse momentum spectra of direct photons can be explained much more easily, while a good explanation of the observed elliptic flow of direct...
115.
QGP parameter extraction via a global analysis of event-by-event flow coefficient distributions
Mr
Jonah E. Bernhard
(Duke University)
20/05/2014, 16:30
Correlations and Fluctuations
Poster
A primary goal of heavy-ion physics is the measurement of the fundamental properties of the quark-gluon plasma (QGP), notably its
transport coefficients, such as the specific shear viscosity $\eta/s$. Since these properties are not directly measurable, one relies on a
comparison of the data to computational models of the time-evolution of the collision to connect measured observables to the...
Gabriel Denicol
(McGill University),
Harri Niemi
(University of Jyväskylä)
20/05/2014, 16:30
Collective Dynamics
Poster
We investigate the applicability of fluid dynamics in ultrarelativistic heavy ion (AA) collisions and high multiplicity proton nucleus (pA) collisions.
In order for fluid dynamics to be applicable the microscopic and macroscopic scales of the system have to be sufficiently separated. The degree of separation can be quantified by the ratio between these scales, usually refered as the Knudsen...
Prof.
Gennady Zinovjev
(National Academy of Sciences of Ukraine (UA))
20/05/2014, 16:30
QCD Phase Diagram
Poster
Exactly integrable (in the Luttinger’s sense) quark models of quantum field theory with infinite correlation length are considered. We calculate the form of energy distribution and find out such a form results in an instability of standard vacuum quark ensemble---Dirac sea. Then the corresponding momentum distribution becomes infinitely narrow with momentum cutoff going to infinity and leads...
Dr
Li Yan
(IPhT Saclay)
20/05/2014, 16:30
Approach to Equilibrium
Poster
In this talk, I would like to report the results of our recent work on the thermalization of gluons and $N_f$ flavors of massless quarks and antiquarks in a spatially homogeneous
system. First, we give two coupled transport equations for gluons and quarks (and antiquarks), which are derived within the diffusion approximation of
the Boltzmann equation with only $2\leftrightarrow 2$...
Gergely Barnafoldi
(Hungarian Academy of Sciences (HU))
20/05/2014, 16:30
QCD at High Temperature and/or Density
Poster
We present the derived entropy formulas for finite reservoir systems, S(q), from universal thermostat independence and obtain the functional form of the corresponding generalized entropy-probability relation [1]. Our result interprets thermodynamically the subsystem temperature, T(1), and the index q in terms of the temperature, T , entropy, S , and heat capacity, C of the reservoir as and ....
Kanako Yamazaki
(University of Tokyo)
20/05/2014, 16:30
QCD at High Temperature and/or Density
Poster
We study the QCD phase transition, especially the change of degrees of freedom from hadrons to quarks. In order to describe the chiral phase transition and the deconfinement transition at the same time, we choose the Nambu-Jana-Lasinio model with Polyakov loop (PNJL model). This model was proposed by combining the Nambu-Jana-Lasinio model which describes the chiral transition and the Polyakov...
Qian Yang
(U)
20/05/2014, 16:30
Open Heavy Flavour and Quarkonia
Poster
Quarkonium production in heavy-ion collisions is an important tool for studying the properties of quark-gluon-plasma (QGP). Interpretation of these results requires a good understanding of the production
mechanisms in p$+$p collisions, which include direct production via gluon fusion, parton fragmentation, and feed down from higher quarkonium states. Despite decades of efforts, the quarkonium...
Andreas Windisch
(University of Graz)
20/05/2014, 16:30
QCD at High Temperature and/or Density
Poster
In the ongoing effort to map the QCD phase diagram, the region of low
temperature and moderately high density is particularly challenging for
theorists. The phase structure in that region is determined by
competition between Cooper pairing (driven by attractive strong
interactions) and the strange quark mass (which is a source of flavor
asymmetry, separating the Fermi momenta of the three...
Dr
Umme Jamil Begum
(Debraj Roy College, Golaghat, Assam, India)
20/05/2014, 16:30
Open Heavy Flavour and Quarkonia
Poster
Heavy quarks produced in the initial stage of heavy ion collisions would traverse the quark gluon plasma. While traversing the quark gluon plasma, they will loose energy by colliding with quarks and gluons and also by radiating gluons. After their production, they may get fragmented into heavy mesons by picking up light quarks/antiquarks and in turn may decay through leptonic channels. These...
Jamal Jalilian-Marian
(Baruch College)
20/05/2014, 16:30
Initial State Physics
Poster
We study diffraction in proton-proton and ultra-peripheral heavy ion collisions at RHIC and the LHC using a gluon saturation-based model. The building blocks of the model are gluon ladders, singlet states of two-Reggeized gluons which satisfy the BFKL evolution equation, as well as multi-pomeron ($1\rightarrow 2, 2\rightarrow 3, 1\rightarrow 3$) vertices which describe how one pomeron may...
Florian Senzel
(Goethe-Universität Frankfurt)
20/05/2014, 16:30
Jets
Poster
Experimental data measured in $\sqrt{s}$ = 2.76 ATeV Pb+Pb collisions by the LHC experiments show a significant imbalance in the transverse momenta of the two leading reconstructed jets. This momentum imbalance is caused by the different in-medium path lengths and thereby different energy and momentum losses of the di-jets due to the passage through the created hot and dense matter. For...
Claudia Behnke
(U)
20/05/2014, 16:30
Electromagnetic Probes
Poster
Lepton pairs emerging from decays of virtual photons represent promising probes of matter under extreme conditions. In the energy domain of 1 - 2 GeV per nucleon, the HADES experiment at GSI Helmholtzzentrum fuer Schwerionenforschung in Darmstadt studies di-electrons and strangeness production in various reactions, i.e.
collisions of pions, protons, deuterons and heavy-ions with nuclei. An...
Chiara Zampolli
(Universita e INFN (IT))
20/05/2014, 16:30
Open Heavy Flavour and Quarkonia
Poster
The study of open heavy flavour production is one of the most effective tools to investigate the properties of the strongly interacting medium created in heavy-ion collisions.
For example, the baryon to meson ratio such as $\Lambda_{c}/{\rm D}$ offers the possibility to shed light on the thermalization and hadronization processes in the medium.
An important baseline to interpret heavy-ion...
Amaresh Jaiswal
(Tata Institute of Fundamental research, Mumbai)
20/05/2014, 16:30
New Theoretical Developments
Poster
By employing Chapman-Enskog like expansion for the non-equilibrium single-particle phase-space distribution function, I solve iteratively the Boltzmann equation with relaxation time approximation for the collision term. I demonstrate that this method of obtaining the non-equilibrium distribution function has several welcome features in contrast to the widely used Grad's 14-moment...
Dr
LongGang Pang
(Central China Normal University)
20/05/2014, 16:30
Correlations and Fluctuations
Poster
Two dimensional low-pT dihadron correlations in azimuthal angle ϕ and pseudo-rapidity η in high-energy heavy-ion collisions are investigated within both the HIJING Monte Carlo model and an event-by-event (3+1)D ideal hydrodynamic model. Without final-state interaction and collective expansion, dihadron correlations from HIJING simulations have a typical structure from minijets that contains a...
Kefeng Xin
20/05/2014, 16:30
Electromagnetic Probes
Poster
In ultrarelativistic heavy-ion collisions, due to the high particle multiplicities, a produced muon can be bound to a charged hadron (proton, antiproton, $K^{+}$, $K^{-}$, $\pi^{+}$, $\pi^{-}$) by Coulomb force and form a hydrogen-like atom. Muon identification at low transverse momentum from the Time-of-Flight detector and the Time Projection Chamber provides STAR a great opportunity to...
Kenta Shigaki
(Hiroshima University (JP))
20/05/2014, 16:30
Electromagnetic Probes
Poster
A very intense U(1) magnetic field is expected to be created in relativistic heavy-ion collisions. The field in non-central Pb-Pb collisions at the LHC energy should reach about $10^{14}$ T. It is not only the most intense in the universe, far beyond the field on the surfaces of magnetars ($\sim 10^{11}$ T), but also is interesting in terms of fundamental physics as it is well above the...
Mr
TOMOYA HOSHINO
(Hiroshima University)
20/05/2014, 16:30
Initial State Physics
Poster
Several models predict a strong magnetic field may be created in high-energy heavy-ion collisions by light-speed moving spectators and collision participants. The field can reach as high as $10^{14}$ teslas at RHIC, and rapidly decreases in a few fm/c. Such a strong field may exhibit charge distribution asymmetry with respect to the magnetic field direction that is orthogonal to the reaction...
Zack Wolff
(Purdue University)
20/05/2014, 16:30
Collective Dynamics
Poster
Comparing hydrodynamic simulations to heavy ion data inevitably requires
the conversion of the fluid to particles. This conversion, typically done
in the Cooper-Frye formalism, is ambiguous for viscous fluids. We compute
self-consistent phase space corrections by solving the linearized Boltzmann
equation and contrast the solutions to those obtained using the ad-hoc
``democratic Grad''...
Victor Roy
(Central China Normal University)
20/05/2014, 16:30
Correlations and Fluctuations
Poster
The event planes have played an important role in the experimental study of fluid dynamics and transport properties of the dense matter in heavy-ion collisions. Recently the correlation of different order event planes has also emerged as a promising tool to study the initial state of the high-energy nucleus-nucleus collisions. In the idealized case, event planes at different rapidities are...
Martin Völkl
20/05/2014, 16:30
Open Heavy Flavour and Quarkonia
Poster
The ALICE Collaboration at the LHC studies nucleus-nucleus collisions with the aim of investigating the properties of the high energy density state of strongly-interacting matter produced in heavy-ion collisions, the Quark-Gluon Plasma (QGP). Heavy quarks (charm and beauty) are an effective probe to investigate the properties of the QGP. They are produced almost exclusively in the...
Mr
Robert Lang
(TUM, RIKEN)
20/05/2014, 16:30
QCD at High Temperature and/or Density
Poster
Heavy-ion collisions at RHIC and LHC suggest that the shear viscosity to entropy ratio, $\eta/s$, is close to the AdS/CFT benchmark $1/4\pi$ indicating a strongly correlated state of matter produced in such collisions. The ratio $\eta/s$ is investigated in the vicinity of the chiral crossover using the two-flavor NJL model in a large-$N_c$ expansion. We study the non-perturbative structure of...
Andrej Ficnar
(Columbia University in the City of New York)
20/05/2014, 16:30
Jets
Poster
A new shooting string holographic model of jet quenching of light quarks in strongly coupled plasmas is presented [1,2] to overcome the serious inadequacies of previous falling string holographic scenarios especially at LHC. We will apply this framework to compute the nuclear modification factor RAA and the elliptic flow v2 and show that this model improves greatly the comparison with recent...
Sandeep Chatterjee
(National Institute of Science Education and Research)
20/05/2014, 16:30
Correlations and Fluctuations
Poster
The rich sign structures of cumulants of conserved charges in the critical region
are investigated in a QCD like model- the $\left(2+1\right)$ flavor Polyakov Quark Meson model.
We compute all susceptibilities of the conserved charges on the $\mu_B-T$ plane upto
fourth order and a few even higher orders. By varying the
mass of the sigma meson, we are able to study and compare scenarios...
A. Jipa
(Faculty of Physics, University of Bucharest, Romania)
20/05/2014, 16:30
Collective Dynamics
Poster
Recently, an integrated on-line system for the study of the interactions in High Energy Physics, called YaPT, was developed at the calculation center of the Research Centre „Nuclear Matter in Extreme Conditions” [1]. Using this system, a systematic study of the Au-Au collisions at SIS-100 (FAIR-GSI) energies with a few simulation codes, as well as using a phenomenological geometric picture of...
Sidharth Kumar Prasad
(Wayne State University (US))
20/05/2014, 16:30
Collective Dynamics
Poster
Non-diffractive proton-proton collisions can be classified into ``soft'' and ``hard'' (or ``semi-hard'') interactions,
with hard (or semi-hard) interactions involving hard parton-parton interactions due to large momentum transfer
resulting into jets, whereas interactions without a jet (or minijet) can be considered as soft interactions.
Energy invariance in the properties of soft events...
Sarah Campbell
(Iowa State University)
20/05/2014, 16:30
Electromagnetic Probes
Poster
In heavy ion collisions at RHIC and the LHC, direct photons are produced in excess of their respective $T_{AA}$-scaled p+p spectra at low $p_T$ from 1-4 GeV/c. These results suggest early-stage thermal partonic emission from the hot dense medium. Additionally, these soft photons are produced with a large azimuthal anisotropy, an elliptic flow ($v_2$) as large as that of pions. Hydrodynamic...
James Nagle
(Unknown)
20/05/2014, 16:30
Future Experimental Facilities, Upgrades, and Instrumentation
Poster
Near the transition temperature, $T_C$, the strongly coupled QGP
exhibits nearly inviscid flow. How the quantum-bounded low viscosity
of QGP arises from the interactions of pointlike partons is not known
in detail. Addressing this fundamental question experimentally
requires measurements provided by scale-sensitive probes over a range
of temperatures in the vicinity of $T_C$. Fully...
Shoichiro Tsutsui
(Kyoto University)
20/05/2014, 16:30
Approach to Equilibrium
Poster
Important mechanisms of thermalization in relativistic heavy ion collisions
are considered to be particle production and collision processes under the time dependent classical gluon fields and plasma instabilities. Non-equilibrium quantum field theory with 2 particle irreducible (2PI) effective action of pure Yang-Mills theory can describe the classical field and particle...
Dr
Andrew Adare
(University of Colorado)
20/05/2014, 16:30
Open Heavy Flavour and Quarkonia
Poster
Quantitative knowledge of heavy quark momentum distributions in the hot nuclear medium created by ultrarelativistic heavy ion collisions is of high value in quantitatively understanding the quark-gluon plasma (QGP) phase of nuclear matter. In particular, the modification of heavy-quark momentum distributions from nuclear collisions as compared to smaller collision environments (such as p+p)...
Mr
Arbin Timilsina
(Iowa State Univeristy)
20/05/2014, 16:30
Jets
Poster
Arbin Timilsina for the PHENIX Collaboration
Status of Jet Reconstruction in Cu+Au collisions at 200 GeV from PHENIX
Jet reconstruction in heavy ion collisions is a vital tool to explore medium effects, including energy loss and modification of parton fragmentation functions. In 2012, making use of the unique capabilities of RHIC to collide different nuclei, the PHENIX experiment...
Carsten Omet
(GSI Helmholtzzentrum für Schwerionenforschung mbH)
20/05/2014, 16:30
Future Experimental Facilities, Upgrades, and Instrumentation
Poster
The unique facility for Antiproton and Ion Research – FAIR will deliver stable and rare isotope beams covering a huge range of intensities and beam energies. The construction of the modularized start version of FAIR has been started. Major civil construction measures, e.g. the site preparation and the drilling of the 60 m deep building foundations are presently being implemented. Procurement...
Vladimir Kekelidze
(Joint Inst. for Nuclear Research (RU))
20/05/2014, 16:30
Future Experimental Facilities, Upgrades, and Instrumentation
Poster
The NICA (Nuclotron-based Ion Collider fAcility) project is now under active realization stage at the Joint Institute for Nuclear Research (JINR, Dubna). The main goal of the project is an experimental study of hot and dense strongly interacting matter in heavy ion collisions at centre-of-mass energies √s_NN = 4 - 11 GeV (NN-equivalent) and the average luminosity of 10E27 cm-2 s-1 for Au(79+)...
Dr
Janus Weil
(FIAS)
20/05/2014, 16:30
Electromagnetic Probes
Poster
We present transport-model simulations of proton-nucleus and nucleus-nucleus
collisions at SIS energies, primarily focusing on electromagnetic and strange
observables in order to learn about the properties of mesons in a dense nuclear
medium. Dilepton and kaon spectra measured by the HADES detector at GSI are
being confronted with transport simulations obtained with the GiBUU model....
Boris Tomasik
(Univerzita Mateja Bela (SK))
20/05/2014, 16:30
Thermodynamics and Hadron Chemistry
Poster
We review the production of strange hadrons in nuclear collisions in which the collision energy pre nucleon is below or just slightly above the threshold for strangeness production. First, a statistical model is formulated in which the exact conservation of strangeness and averaging over impact parameter can properly be handled. The observed data are compared with the predictions of the model...
Albert Loctionov
(Institute of Physics and Technology)
20/05/2014, 16:30
Correlations and Fluctuations
Poster
Estimation of fluctuations in initial conditions of nuclei interactions is one of the key problems for heavy ion physics. Right solution can be obtained, using correlations between multiplicity and sum of all, – light and heavy, - fragment-spectators (Fig a). Great significance of heavy fragment analysis has already been pointed out in the works of NA-49 (H. Appelshauer, 1998) and NICA (M....
Dr
LIANG XUE
(Georgia State University)
20/05/2014, 16:30
Future Experimental Facilities, Upgrades, and Instrumentation
Poster
High energy heavy ion collisions at RHIC create strongly coupled, hot, dense matter (quark-gluon plasma), which performs like a perfect fluid. Fundamental questions such as how and why the quark-gluon plasma behaves as a perfect fluid in the vicinity of the critical temperature, can only be fully addressed with world-class
jet observables at RHIC energies. Jet probes in medium are crucial to...
Rama Chandra Baral
(Institute of Physics (IN))
20/05/2014, 16:30
QCD at High Temperature and/or Density
Poster
We report $\Lambda^{\ast}$(1520) production in pp collisions at $\sqrt{s}$ = 7 TeV and in p-Pb collisions at $\sqrt{s_{\rm NN}}$ = 5.02 TeV by ALICE at the LHC. The study of $\Lambda^{\ast}$ production is important because its lifetime is comparable to the lifetime of the fireball and it contains all three light quarks (uds) as valence quarks. The study of $\Lambda^{\ast}$ production can also...
Chitrasen Jena
(Universita e INFN (IT))
20/05/2014, 16:30
Open Heavy Flavour and Quarkonia
Poster
Charm and beauty quarks are powerful probes to investigate the properties of the Quark-Gluon Plasma (QGP)
produced in high-energy heavy-ion collisions. Due to their large mass, they are produced in the initial hard
scattering processes and thus they experience the whole evolution of the system formed in the collision.
They interact strongly with the deconfined medium, losing energy and...
Chiara Bianchin
(University of Utrecht (NL))
20/05/2014, 16:30
Open Heavy Flavour and Quarkonia
Poster
Heavy-flavour hadrons and jets are effective probes for the characterisation of the strongly interacting matter formed in high-energy heavy-ion collisions, known as Quark-Gluon Plasma. Tagging jets by looking for a D meson within their cone provides a sample of jets originating from charm quark fragmentation and thus allowing us to improve our understanding of heavy-quark fragmentation, both...
Shinichi Hayashi
(University of Tokyo (JP))
20/05/2014, 16:30
Electromagnetic Probes
Poster
The primary role of the ALICE experiment at the LHC is to investigate the properties of the deconfined state of matter, the quark-gluon plasma (QGP), created in relativistic heavy-ion collisions. Electron-positron pairs (dielectrons) are excellent probes for studying the properties of the medium. They are produced during the entire evolution of the system and carry the information of the...
Melike Akbiyik
(KIT - Karlsruhe Institute of Technology (DE))
20/05/2014, 16:30
Initial State Physics
Poster
Di-lepton production in photon-photon collisions is a benchmark process that allow for precise determination of the luminosity at the LHC. In particular in collisions, where at least one of the nuclei is a lead nucleus, the photon fluxes are large enough to make efficient use of it. In this analysis di-muon production during the pPb run in 2013 is analysed using dedicated triggers. Any...
Satoshi Yano
(Hiroshima University (JP))
20/05/2014, 16:30
Jets
Poster
ALICE is one of the experiments at LHC and is mainly dedicated for heavy-ion collisions
to investigate properties of a deconfined state of matter, Quark-Gluon Plasma (QGP).
High $p_{\rm T}$ particle production is expected to be a powerful tool to study the QGP.
The hadron yields in nucleus-nucleus collisions can be quantified by the nuclear modification factor,
which is the ratio of...
Tsubasa Okubo
(Hiroshima University (JP))
20/05/2014, 16:30
Jets
Poster
Quark-Gluon Plasma (QGP) which is believed to have existed in a very early universe, is a high temperature and
dense matter. The ALICE experiment is optimized for heavy-ion collisions and intended to explore the property of
QGP. The study of hadron production is essential for the properties of QCD matter. In p-Pb collisions at a high
energy region, it enables estimation of the initial...
Margaret Jezghani
(Georgia State University)
20/05/2014, 16:30
Open Heavy Flavour and Quarkonia
Poster
A major objective in the field of heavy ion collisions is to quantify and characterize the properties of QGP by studying heavy flavor production. The $J/\psi$ meson can be produced in one of three ways: 1) directly in the collision, 2) indirectly via feeddown from heavier charmonium states, or 3) from the decay of B mesons. If the $J/\psi$ is produced through either of the first two methods,...
Yvonne Chiara Pachmayer
(Ruprecht-Karls-Universitaet Heidelberg (DE))
20/05/2014, 16:30
Open Heavy Flavour and Quarkonia
Poster
In high-energy nucleus-nucleus collisions, heavy-flavour quarks,
i. e. charm and beauty, are produced on a very short time scale in
initial hard scattering processes and thus they experience the whole
history of the collision. Therefore, they are valuable probes to study
the mechanisms of energy loss and hadronisation in the hot and dense
state of matter, that is expected to be...
Jiri Kral
(University of Jyvaskyla (FI))
20/05/2014, 16:30
Jets
Poster
Jet properties are influenced by both perturbative and non-perturbative processes that take place during the jet fragmentation. Transverse momentum distributions in jets provide insight into the gluon radiation patterns in jet fragmentation. At the Tevatron it was found that the distribution of the component of the momentum transverse to the jet axis ($j_{\rm T}$) of jet constituents agrees...
Stephan Endres
(Frankfurt University / Frankfurt Institute for Advanced Studies)
20/05/2014, 16:30
Electromagnetic Probes
Poster
Lepton pairs at low mass from heavy-ion collisions are considered good probes for chiral symmetry restoration and the in-medium properties of vector mesons. However, the broad variety of their sources requires models that can describe the complete nuclear reaction properly. For this, transport approaches (e.g. the UrQMD model) are frequently used, as they yield a realistic microscopic...
Tomas Balog
(GSI)
20/05/2014, 16:30
Future Experimental Facilities, Upgrades, and Instrumentation
Poster
The Silicon Tracking System will be installed into the superconducting dipole magnet, providing sufficient aperture to receive it's 2 m$^3$ volume, the vacuum chamber with target and Micro Vertex Detector, and the beam pipe. The detector system breaks down into eight tracking stations, built from a total of 106 carbon fiber ladders with 896 detector modules comprising 1220 silicon microstrip...
Benjamin Bannier
(Stony Brook University)
20/05/2014, 16:30
Electromagnetic Probes
Poster
Since the earliest days of Heavy Ion Physics thermal soft photon radiation emitted during the reaction had been theorized as a *smoking gun* signal for formation of a quark-gluon plasma and as a tool to characterize its properties.
In recent years the existence of excess photon radiation in heavy ion collisions over the expectation from initial hard iteractions has been confirmed at both...
Lizardo Valencia Palomo
(Univ. Blaise Pascal Clermont-Fe. II (FR))
20/05/2014, 16:30
Future Experimental Facilities, Upgrades, and Instrumentation
Poster
The ALICE experiment is dedicated to the study of the quark gluon plasma in heavy-ion collisions at the CERN LHC. The Muon Forward Tracker (MFT), an internal tracker added in the acceptance of the existing Muon Spectrometer ($2.5 < \eta < 4$), will be part of the ALICE detector upgrade program to be put in place during the LHC shutdown planned for 2019. The precise measurement of the offset to...
Mr
Paul Springer
(Technische Universität München)
20/05/2014, 16:30
QCD Phase Diagram
Poster
The phase structure of QCD is currently a much discussed topic in particle physics. In the context of this discussion we need precise knowledge about the nature of the chiral phase transition. A powerful tool to investigate it are lattice simulations. They are, however, still restricted to relatively large quark masses, far from the chiral limit, and to small volumes, which could affect the...
Jan Kopfer
(University Wuppertal)
20/05/2014, 16:30
Future Experimental Facilities, Upgrades, and Instrumentation
Poster
The Compressed Baryonic Matter (CBM) experiment at the Facility for Antiproton and Ion Research (FAIR) will explore the phase diagram of nuclear matter at very high net-baryon densities and moderate temperatures. It is designed for operation in fixed target mode to study ultrarelativistic nucleus-nucleus collisions at beam energies up to 45 AGeV with unprecedented statistical precision.
An...
Dr
Kenji Morita
(Frankfurt Institute for Advanced Studies)
20/05/2014, 16:30
Correlations and Fluctuations
Poster
Statistical fluctuations of the net baryon number and electric charge
have been regarded as an excellent diagnostic tool of the chiral phase
transition in QCD and in heavy ion collisions [1]. While
the second order cumulant exhibits divergence at the critical endpoint,
the higher order cumulants can reveal remnants of the $O(4)$ criticality
at the chiral crossover [2].
We will...
Jan Steinheimer
20/05/2014, 16:30
Correlations and Fluctuations
Poster
We present fluid dynamical simulations of relativistic nuclear collisions,
augmented with a finite-range term, to study the effects of the phase structure
on the evolution of the baryon density.
For collision energies that bring the bulk of the system
into the mechanically unstable spinodal region of the phase diagram,
the density irregularities are being amplified significantly.
The...
Jean-Francois Paquet
(McGill University)
20/05/2014, 16:30
Electromagnetic Probes
Poster
Currently the IP-Glasma initial state, coupled with a viscous hydrodynamic evolution, provides the best description of hadronic flow coefficients and their fluctuations in heavy ion collisions [1]. In this work we perform the first calculation of electromagnetic radiation using IP-Glasma initial conditions. We include the contributions from pQCD photons arising from the initial hard...
Dr
Anton Wiranata
(CCNU)
20/05/2014, 16:30
QCD at High Temperature and/or Density
Poster
The ratio η/s of the shear viscosity, η, and the entropy density, s, of hot interacting hadrons is
calculated using the Chapman-Enskog and virial expansion methods. Interactions are parametrized
using the K-matrix which preserves the unitarity of the S-matrix. In the four component mixture
π-K-η-N , 57 resonances up to 2 GeV are included. Increasing number of resonances is shown to
reduce...
Krisztian Krajczar
(CERN)
20/05/2014, 16:30
Initial State Physics
Poster
The forwards-backwards asymmetry ($Y_{asm}$) of inclusive charged particles is reported as a function of transverse momentum in pPb collisions at $\sqrt(s_{NN})$=5.02 TeV as measured with the CMS detector. These asymmetries are constructed from the charged particle transverse momentum spectra measured for 0.4 < $p_T$ < 100 GeV/c, and in six pseudorapidity classes ranging from 0.3 to 1.8. In...
Gokce Basar
(Stony Brook University)
20/05/2014, 16:30
Electromagnetic Probes
Poster
I introduce a novel mechanism for anisotropic photon and dilepton production in heavy ion collisions, stemming from the interplay between the fluctuations of gluonic matter, fermonic loops and the existence of strong (electro)magnetic fields. A particular example of this mechanism is tied with the conformal anomaly of QCD and described by the hydrodynamical bulk modes of QCD plasma. I show...
Bikash Sinha
(Variable Energy Cyclotron Centre, Kolkata, India)
20/05/2014, 16:30
New Theoretical Developments
Poster
It is entirely plausible, that a first order QCD phase transition under a reasonable condition occurred from quarks to hadrons when the universe was about a microsecond old. It is shown in this paper that the quark nuggets, possible relics of the first order QCD phase transitions with baryon number larger than $10^{43}$ will survive the entire history of the universe uptil now and can be...
Dr
Viktor Begun
(UJK)
20/05/2014, 16:30
Thermodynamics and Hadron Chemistry
Poster
Statistical models of hadron production have become one of the cornerstones of our understanding of ultra-relativistic heavy-ion collisions [1]. However, the measured proton abundances in Pb+Pb collisions at sqrt(sNN) = 2.76 TeV at LHC do not agree with the most common versions of the thermal models. Besides the proton anomaly, the same LHC data exhibits the low-transverse-momentum enhancement...
Laszlo Olah
(Hungarian Academy of Sciences (HU))
20/05/2014, 16:30
Future Experimental Facilities, Upgrades, and Instrumentation
Poster
The High Momentum Particle Identification Detector (HMPID) is specifically developed for track-by-track particle identification in ALICE. The HMPID is a ring imaging Cherenkov detector with an active area of 10.5 m$^2$ of caesium iodide photo-cathodes installed in MWPC-s filled with pure methane. It identifies $\pi^{\pm}$ and K$^{\pm}$ in the momentum range $1-3$ GeV/$c$, and p in the range...
J. Matthew Durham
(Los Alamos National Laboratory)
20/05/2014, 16:30
Future Experimental Facilities, Upgrades, and Instrumentation
Poster
After more than a decade of discovery physics at RHIC, major questions still remain concerning QCD color screening and the exact mechanisms governing parton energy loss in the nuclear medium that is created in ultrarelativistic collisions of large nuclei. To answer these questions, the PHENIX experiment has developed and installed a new silicon detector which dramatically enhances the...
Frank Geurts
(Rice University (US))
20/05/2014, 16:30
Electromagnetic Probes
Poster
Dileptons in the low mass region, ($M_{ll} < 1.1 {\rm GeVc}^{-2}$), retain
information about vector mesons that originated in the strongly
interacting matter created by relativistic heavy-ion collisions.
Linking these vector mesons to an in-medium broadening of their spectral
functions may suggest chiral symmetry restoration[1]. Measurements at SPS
and RHIC energies have been made in the...
francesco scardina
(INFN Catania)
20/05/2014, 16:30
Open Heavy Flavour and Quarkonia
Poster
The heavy quarks constitutes a unique probe of the quark-gluon plasma properties.
Both at RHIC and LHC energies it has been observed a puzzling correlation
between the nuclear modification factor $R_{AA}$ and the elliptic flow $v_2$ that has challenged
all the existing models, especially for D mesons, We discuss how the treatment of the
charm quark dynamics according to a Boltzmann or a...
Roy Lacey
(Stony Brook University)
20/05/2014, 16:30
Initial State Physics
Poster
It will be demonstrated that initial-state geometry and its attendant fluctuations play a central and consistent mechanistic role for collective anisotropic flow, jet quenching and the space-time expansion dynamics of the matter created in collisions at RHIC and the LHC. The implications of this mechanistic role for the extraction of several transport and thermodynamic coefficients will be discussed.
Markus Hopfer
(Karl-Franzens University Graz)
20/05/2014, 16:30
QCD at High Temperature and/or Density
Poster
The quark-gluon vertex function, describing the (non-perturbative) interactions of quarks with gluons, plays a central role in and is subject to dynamical chiral symmetry breaking. Accordingly, its change across the QCD crossover transition drives on the one hand important aspects of the phase transition and on the other hand its structure changes substantially.
Results for the quark-gluon...
Frank Geurts
(Rice University (US))
20/05/2014, 16:30
Future Experimental Facilities, Upgrades, and Instrumentation
Poster
The 2014 RHIC run marks the complete installation of the Muon Telescope
Detector (MTD) by the STAR Collaboration. This detector upgrade is based
on long Multi-gap Resistive Plate Chambers (MRPCs) which have been
mounted outside STAR's magnet yoke. The MTD provides a coverage of 45%
in azimuth over almost one unit of pseudorapidity, centered around
mid-rapdity . The detector, in...
Michal Vajzer
(Acad. of Sciences of the Czech Rep. (CZ))
20/05/2014, 16:30
Jets
Poster
Recent experimental results on jet production at LHC show that next-to-leading order (NLO) calculations are required to achieve good description of data.
In this contribution, the study of NLO simulations of jet production in proton-proton collisions with centre of mass energy of 7 TeV and proton-lead collisions at 5.02 TeV is presented.
These simulations were carried out using POWHEG-Box,...
Dr
Sayantan Sharma
(Bielefeld University)
20/05/2014, 16:30
Thermodynamics and Hadron Chemistry
Poster
In the discussion of hadronization at or close to the freeze-out
curve, statistical (hadron resonance gas) models play an important
role. In particular in the charmonium sector, regeneration models
are considered which rely on the fact that charmonium states can
form again already at temperatures well above the QCD crossover
or hadronization temperature. An important ingredient in...
Mr
Ben Meiring
(University of Cape Town)
20/05/2014, 16:30
New Theoretical Developments
Poster
The violent production of a hard, colored object in hadronic collisions causes drastic--but perturbatively calculable--changes to the vacuum. We quantitatively explore this modification of the vacuum produced by strong interactions by explicitly computing the full time and spatial dependence of the QCD energy-momentum tensor associated with a hard production event. The derivation adapts the...
Jiechen Xu
(Columbia University)
20/05/2014, 16:30
Jets
Poster
We present a $\chi^2/d.o.f.$ analysis of RHIC and LHC $R_{AA}$ ($p_T>10$ GeV/c) and $v_2$ ($p_T>10$ GeV/c) data using the new open C++ source CUJET2.0 code [1] developed as a component of the DOE JET collaboration project. The code evaluates jet path integral involving running coupling DGLV induced radiated gluon energy loss rates as well as elastic energy loss for jets propagating though...
Mr
Daniel Robaina
(Institute of Nuclear Physics, University of Mainz)
20/05/2014, 16:30
QCD at High Temperature and/or Density
Poster
The dispersion relation of the pion quasiparticle is calculated in the
confined phase of QCD with two light flavors of quarks using lattice
simulations. In the hadron gas, the would-be diffusion pole of the
axial charge density and the Goldstone boson of chiral symmetry
breaking "mix"; as a result, a single light quasiparticle emerges
whose dispersion relation can be determined from...
Clint Young
(University of Minnesota)
20/05/2014, 16:30
Correlations and Fluctuations
Poster
The thermal fluctuations inherent in viscous hydrodynamics are significant when examining a fluid either at small length scales or near a critical point. Both of these conditions can be met in ultra-relativistic heavy-ion collisions. These fluctuations have small but non-vanishing effects on observables at the Relativistic Heavy-Ion Collider (RHIC) and at the Large Hadron Collider (LHC)....
Rainer Stiele
(Heidelberg University)
20/05/2014, 16:30
QCD Phase Diagram
Poster
Polyakov-loop-extended constituent-quark models are useful to investigate the phase structure and thermodynamics of strongly-interacting matter. We show that taking into account the quark backreaction on the gauge-field dynamics as well as quantum and thermal fluctuations of quarks and mesons is crucial in such models to achieve results for order parameters and thermodynamics that are in line...
Bruno Mintz
(Universidade do Estado do Rio de Janeiro - Brazil)
20/05/2014, 16:30
QCD at High Temperature and/or Density
Poster
In an attempt to solve the problem of spurious gauge copies in the path integral approach to gauge theories, V. N. Gribov proposed in 1978 a method to restrict the integration domain of the path integral to only one gauge field representative of each physical field configuration. As a result, the quadratic part of the gluon propagator is modified in the infrared, so that it acquires complex...
Michael Kordell
(W)
20/05/2014, 16:30
Jets
Poster
We take a detailed look at high transverse momentum (high $p_T$) particle and jet production in d-Au collisions at RHIC and p-Pb collision at LHC. In particular, we study the correlation between jet production and the number of charged particles produced, which allows collisions to be binned in centrality. While Hulthen distributions are used to sample the spatial distribution of nucleons in...
Dr
Ernst-Michael Ilgenfritz
(JINR Dubna, VBLHEP and BLTP)
20/05/2014, 16:30
QCD at High Temperature and/or Density
Poster
We present first results achieved within a recently started project
dealing with lattice QCD thermodynamics in the presence of two dynamical
quark generations. We explore temperatures ranging from 150 to 650 MeV
employing the twisted mass discretization for Wilson-type quarks and
following a fixed-lattice scale approach at three different lattice
spacings in order to control the approach...
David Zaslavsky
(Penn State University)
20/05/2014, 16:30
Initial State Physics
Poster
Earlier this year, we published the first numerical calculation to incorporate all next-to-leading order (NLO) corrections for the forward pion production cross section in pA collisions. Our calculation gives a good description of existing results from RHIC at $p_\perp$ up to the saturation scale. I will present an overview of the calculation, review the results for RHIC as compared to the...
Elena Bratkovskaya
(FIAS)
20/05/2014, 16:30
QCD at High Temperature and/or Density
Poster
We study the transport properties of strongly interacting matter in the vicinity of the phase transition for different effective models, i.e. the Nambu-Jona-Lasinio (NJL) model and the Dyniamical QuasiParticle Model (DQPM) for 3 quark flavours. We present our results on the temperature dependence of the shear and bulk viscosity (calculated within the relaxation time formalism), as well as of...
Guo-Liang Ma
(Shanghai INstitute of Applied Physics (SINAP), CAS)
20/05/2014, 16:30
Jets
Poster
Within a multiphase transport model, several experimental observables related to reconstructed jets, including the transverse momentum imbalance for photon-jet, transverse momentum asymmetry for dijet, jet fragmentation function, jet shape, and jet flow, are investigated in Pb+Pb collisions at $\sqrt{s_{_{\rm NN}}}$ = 2.76 TeV. Because the imbalance ratio between photon and jet is sensitive to...
Dr
Sener Ozonder
(Institute for Nuclear Theory, University of Washington)
20/05/2014, 16:30
Correlations and Fluctuations
Poster
The azimuthal angular correlations ("ridge") were well-known from the A+A collisions where the collimation of the hadrons in the azimuthal angle was ascribed to the collective flow of the Quark Gluon Plasma (QGP). The di-hadron correlations in the high multiplicity p+p and p+Pb collision events from the CMS experiment revealed a ridge structure that was very much like the ones from the A+A...
Xu Sun
(Lawrence Berkeley National Laboratory)
20/05/2014, 16:30
Collective Dynamics
Poster
Triangular flow ($v_{3}$), the third harmonic of the azimuthal particle distribution relative to the event plane, is getting more attention in recent years. It is considered that $v_{3}$ is generated by event-by-event initial state fluctuations. Therefore, it is natural to use $v_{3}$ as a tool to study initial state fluctuations and the subsequent evolution of the collision system. Another...
Dr
Oana Ristea
(Faculty of Physics, University of Bucharest)
20/05/2014, 16:30
Collective Dynamics
Poster
In the high-energy nuclear collisions at RHIC, it has been clear evidenced the formation of the hot and dense matter with strong collectivity developed during the entire collision evolution, driven by intense rescattering among the fireball constituents. The measurable observables that can provide information about thermalization and collective flow are the transverse momentum spectra of...
Douglas Wertepny
(The Ohio State University)
20/05/2014, 16:30
Initial State Physics
Poster
We derive the cross-section for two-gluon production in heavy-light ion collisions in the saturation/Color Glass Condensate framework. This is the first-ever two-gluon production calculation including saturation effects to all orders in one of the nuclei (heavy ion) along with a single saturation correction in the projectile (light ion). The calculation of the correlation function predicted...
Dr
Yun Guo
(Universidade de Santiago de Compostela)
20/05/2014, 16:30
QCD at High Temperature and/or Density
Poster
The thermodynamics of pure glue theories can be described in terms of an effective action for the Polyakov loop. This effective action is of the Landau-Ginzburg type and its variables are the angles parametrizing the loop. We compute perturbative corrections to this action. Remarkably, two-loop corrections turn out to be proportional to the one-loop action, independent of the eigenvalues of...
alex mwai
(Stony Brook University)
20/05/2014, 16:30
Correlations and Fluctuations
Poster
Two-pion femtoscopy measurements provide invaluable insights on the expansion dynamics and the space-time extent of the emitting source produced in nucleus collisions at RHIC and the LHC. Recent PHENIX measurements now span a broad range of beam collision energies ($\sqrt{s_{NN}}=39-200$ GeV) and system sizes (d+Au, Cu+Cu and Au+Au). Results from these new measurements will be presented as a...
Vytautas Vislavicius
(Lund University (SE))
20/05/2014, 16:30
Jets
Poster
In Pb-Pb collisions a dense partonic state of matter, the Quark Gluon Plasma, is formed. Jets created in a collision probe the medium, but so far the experimental results on jet quenching cannot be reproduced theoretically: existing QCD models fail to describe both $R_{\text{AA}}$ and $v_{\text{2}}$ consistently at high $p_{T}$. In this talk a data driven study using Glauber simulations for...
Danthasinghe Piyarathna
(University of Houston (US))
20/05/2014, 16:30
Correlations and Fluctuations
Poster
We present measurements of untriggered di-hadron correlations in Pb-Pb collisions at $\sqrt{s_{\rm NN}}$ = 2.76 TeV. The momentum evolution of untriggered data has been studied by applying symmetric $p_{\rm T}$ cuts. A smooth evolution of the structures in the correlation function is observed. We further quantify the evolution of the contributing components by fitting a model function. The ...
Ming Shao
(Univ. of Sci. and Tech. of China)
20/05/2014, 16:30
Future Experimental Facilities, Upgrades, and Instrumentation
Poster
An Electron Ion Collider (EIC) is being considered as the next generation QCD facility to understand the fundamental question that how the visible universe is built up. More specifically, the EIC will probe the low Bjorken-x domain where gluons and sea quarks dominate with unprecedented precision, for both nucleon and nuclei. A possible realization of the accelerator facility based on the...
Robert Vertesi
(Nuclear Physics Institute of the Czech Academy of Sciences)
20/05/2014, 16:30
Open Heavy Flavour and Quarkonia
Poster
Due to color screening, the production of quarkonia in high energy heavy ion collisions is expected to be sensitive to the energy density of the medium. Sequential suppression of different quarkonium states may therefore serve as a thermometer of the medium. Although the suppression of charmonia was anticipated as a key signature of the QGP, the observed energy dependence of $J/\psi$...
Timo Scheib
20/05/2014, 16:30
QCD at High Temperature and/or Density
Poster
In heavy ion collisions at beam energies of 1-2 AGeV, strangeness production can be observed below its elementary production threshold.
In April and May 2012, 7.3 billion Au(1.23 GeV per nucleon)+Au collisions have been recorded by the HADES detector, installed at the Helmholtzzentrum fuer Schwerionenforschung (GSI) in Darmstadt, Germany. In this collision system the weakly decaying strange...
Prof.
Alexander Sorin
(Joint Institute for Nuclear Research (Dubna))
20/05/2014, 16:30
New Theoretical Developments
Poster
Experimental manifestation of P-odd effects related to the vorticity and hydrodynamic helicity in non-central heavy ion collisions is discussed, which is based on their simulation in the NICA kinematics in framework of the kinetic Quark-Gluon String Model. For the NICA heavy ion collisions characterised by the large baryonic charge of the forming medium the effect should manifest in neutron...
Rafal Bielski
(AGH University of Science and Technology (PL))
20/05/2014, 16:30
Electromagnetic Probes
Poster
Lead-lead collisions at the LHC are capable of producing a system of deconfined quarks and gluons
at unprecedented energy density and temperature. Partonic-level
interactions and energy-loss mechanisms in the medium can be studied
with the aid of useful probes. One of these probes are W bosons,
which do not interact with the strongly-coupled medium and may be used
to benchmark the energy...
Bin Zhang
(Arkansas State University)
20/05/2014, 16:30
Collective Dynamics
Poster
Transverse energy is an important characteristic of relativistic heavy ion collisions aiming at creating conditions similar to those existed in the early Universe. The hot and dense matter produced immediately after the collision of a nucleus going in the longitudinal direction and the other in the opposite direction can be considered as being composed of transverse fluid slices undergoing...
Surasree Mazumder
(Variable Energy Cyclotron Centre, Kolkata)
20/05/2014, 16:30
Open Heavy Flavour and Quarkonia
Poster
We endeavour to explore the effect of recoil of heavy flavor jet due to scattering with light quarks. Earlier, neglecting this recoil we have observed a radiationless region along the direction of propagation of heavy quark jet, known as the dead cone. once we allow the heavy quark jet to bend, the dead-cone region is deluged by radiation. Hence this study, on one hand, is a step towards...
Yuji Sakai
(Kyushu University)
20/05/2014, 16:30
QCD at High Temperature and/or Density
Poster
We study the temperature and chemical potential dependence of the momentum distributions of quasi-particles in the quark-gluon plasma.
The Wigner functions of quarks and gluons, whose spatial integration is related to the momentum distributions, are calculated with the 2-flavor lattice QCD simulations.
We found significant changes of the shape of the momentum distribution around the boundary...
Zvi Citron
(Weizmann Institute of Science (IL))
20/05/2014, 16:30
Electromagnetic Probes
Poster
The measurement of Z bosons in heavy ion collisions is an excellent
tool for probing the nucleus at the partonic level. The inclusive
yield provides a stringent test of binary collision scaling. Recent
ATLAS results demonstrate such scaling in Pb+Pb collisions. The 2013
p+Pb physics run at the LHC providing more than 30 nb^-1 of collisions
at an energy of sqrt(s_NN)=5.02 TeV has made a...
