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Scott Pratt (Michigan State University)05/02/2017, 09:00Oral
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Alexei Bazavov (Michigan State University)05/02/2017, 10:15Oral
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Sergei Voloshin (Wayne State University), Sergey Voloshin (Wayne State University (US))05/02/2017, 11:30Oral
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Peter Alan Steinberg (Brookhaven National Laboratory (US))05/02/2017, 12:15Oral
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Gunther Roland (Massachusetts Inst. of Technology (US))05/02/2017, 15:00Oral
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Sangyong Jeon (McGill University)05/02/2017, 15:45Oral
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Christine Aidala05/02/2017, 17:00Oral
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05/02/2017, 17:45Oral
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06/02/2017, 09:00Oral
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Jürgen Schukraft (CERN)06/02/2017, 09:20Oral
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Alexander Schmah (Lawrence Berkeley National Lab)06/02/2017, 10:00
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Darren McGlinchey (University of Colorado)06/02/2017, 10:20
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Manuel Lorenz (University Frankfurt)06/02/2017, 10:40
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Antoni Aduszkiewicz (University of Warsaw (PL))06/02/2017, 10:55
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Anthony Robert Timmins (University of Houston (US))06/02/2017, 11:30
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Jiangyong Jia (State University of New York (US))06/02/2017, 11:50
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Yen-Jie Lee (Massachusetts Inst. of Technology (US))06/02/2017, 12:10
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Patrick Robbe (Universite de Paris-Sud 11 (FR))06/02/2017, 12:30
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Wei Li (Rice University (US))06/02/2017, 14:00
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Prof. Steffen A. Bass (Duke University)06/02/2017, 14:30
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Wilke van der Schee (MIT)06/02/2017, 15:00
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Korinna Christine Zapp (Instituto Superior Tecnico (PT))06/02/2017, 15:30
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James Brandenburg (Rice University)07/02/2017, 08:30
Dileptons ($l^{+}l^{-}$) are produced throughout all stages of heavy-ion collisions and escape with minimum interaction with the strongly interacting medium. For this reason, $l^{+}l^{-}$ pair measurements play an essential role in the study of the hot and dense nuclear matter created in heavy-ion collisions. Dileptons in the low invariant mass region (up to M$_{ll}\sim$1~GeV/c$^2$) retain...
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Filip Krizek (Acad. of Sciences of the Czech Rep. (CZ))07/02/2017, 08:30
We report measurement of the semi-inclusive distribution of charged-particle jets recoiling from a high transverse momentum ($p_{T}$) hadron trigger, for p--Pb collisions at $\sqrt{s_{NN}} =5.02$ TeV that have been classified by event activity. This coincidence observable is calculable perturbatively in vacuum, and has previously been measured in pp and Pb--Pb collisions at the LHC, providing...
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Daniel Tapia Takaki (The University of Kansas (US))07/02/2017, 08:30Initial State Physics and Approach to EquilibriumOral
The quantum fluctuations of the initial state described by the overlap of two highly Lorentz-contracted nuclei traveling on light-cone trajectories are probably imprinted upon the distribution of particles created in the Quark-Gluon Plasma (QGP). Without assessing these quantum fluctuations in nuclei, fundamental properties of the QGP such as its viscosity-to-entropy ratio cannot be determined...
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Joseph Osborn (University of Michigan)07/02/2017, 08:30
Direct photons, being colorless objects, provide an unmodified control particle that can be used in conjunction with jets to probe the quark-gluon plasma. To leading order the direct photon momentum balances the momentum of opposing jets and can therefore provide a clean handle on the jet energy. Therefore, angular correlations with direct photons provide a mechanism to study the fragmentation...
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Dr NIHAR RANJAN SAHOO (Texas A&M University)07/02/2017, 08:50
Jets and their modifications due to partonic energy loss provide a powerful tool to study the properties of the QGP created in ultrarelativistic heavy ion collisions. For correlation studies of jet energy loss, two complementary trigger object choices offer access to the initial hard parton’s energy: On the one hand, direct-photon–tagged jets are a self-generated tomographic medium probe,...
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Tetyana Galatyuk (TU Darmstadt / GSI)07/02/2017, 08:50
We present a first measurement of low-mass electron pairs for a heavy collision-system at SIS18/Bevalac energies. The data is analyzed in terms of excess radiation above a conventional cocktail of contributions from meson decay after thermal freeze-out. We observe a strong excess radiation which is remarkably well described assuming emission from a thermalized system. The high statistics data...
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Maxime Guilbaud (Rice University (US))07/02/2017, 08:50
The formation of a QGP in heavy ion collisions and the hydrodynamic expansion of the created medium are well established and reasonably well understood. This state of nuclear matter was not expected to be found in reactions involving smaller systems, such as the pA and pp collisions. Nevertheless, a wealth of experimental evidence in recent years has suggested the presence of collective...
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Evgeny Kryshen (Petersburg Nuclear Physics Institut (RU))07/02/2017, 08:50Initial State Physics and Approach to EquilibriumOral
Ultra-Peripheral Pb-Pb collisions, in which the two nuclei pass close to each other but at an impact parameter greater than the sum of their radii, provide information about the initial state of nuclei. In particular, heavy vector meson production, where the particle mass sets a hard scale, proceeds in such collisions by photon-gluon interactions, and gives access to nuclear PDFs. The ALICE...
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Hallie Causey Trauger (University of Illinois at Chicago (US))07/02/2017, 09:10
Jet-hadron correlations are used to extend measurements of the properties of jets beyond classic fixed-R jet reconstruction. New measurements using PbPb and pp collision data at $\sqrt{s_{NN}}$ = 5.02 TeV recorded by CMS use a statistical approach that allows for a reliable subtraction of the underlying event beyond the typical distance parameters of jet reconstruction. Measurements of...
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Aaron Angerami (Columbia University (US))07/02/2017, 09:10Initial State Physics and Approach to EquilibriumOral
Beams of relativistic heavy ions are accompanied by a large flux of equivalent photons, and photon-induced reactions are the dominant interaction mechanism in heavy-ion collisions when the colliding nuclei have transverse separation larger that the nuclear diameter. In these ultra-peripheral collisions (UPC) the photon can provide a clean probe of the partonic structure of the nucleus...
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517. Measurements of the dielectron continuum in pp, p-Pb and Pb-Pb collisions with ALICE at the LHCOton Vazquez Doce (Technische Universitaet Muenchen (DE))07/02/2017, 09:10
Dielectrons produced in ultra-relativistic heavy-ion collisions at the LHC provide a unique probe of the whole system evolution as they are unperturbed by final-state interactions. The dielectron continuum is extremely rich in physics sources: on top of ordinary Dalitz and resonance decays of pseudoscalar and vector mesons, thermal black-body radiation is of particular interest as it carries...
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Igor Lakomov (CERN)07/02/2017, 09:10
Two-particle correlations in relative azimuthal angle ($\Delta\phi$) and pseudorapidity ($\Delta\eta$) have been used to study heavy-ion collision dynamics, including medium-induced jet modification. These correlations have been extensively studied in small collision systems by all the four main LHC experiments. Further investigations showed also the importance of Multiple Parton Interactions...
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Mateusz Dyndal (DESY)07/02/2017, 09:30Initial State Physics and Approach to EquilibriumOral
The large equivalent-photon fluxes accompanying Pb ion beams at the LHC initiate photon-photon and photo-nuclear interactions which dominate when the colliding nuclei have large impact parameter (ultra-peripheral collisions). These electromagnetically-induced processes are sensitive to the nuclear wave-function and in particular the nuclear modifications of the nucleon parton distribution...
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WEI CHEN (CCNU)07/02/2017, 09:30
We use a Linear Boltzmann Transport model (LBT model) coupled to (3+1)D ideal hydrodynamic evolution in real time with fluctuating initial conditions to simulate both the transport of jet shower partons and jet-induced medium excitation. In this coupled approach, soft partons from medium recoil and induced radiation from propagation of energetic shower partons in the Linear Boltzmann...
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Steffen Georg Weber (Technische Universitaet Darmstadt (DE))07/02/2017, 09:30
The availability at the LHC of the largest collision energy in pp collisions
allows a significant advance in the measurement of J/$\psi$ production as function
of event multiplicity. The interesting relative increase observed with data
at the LHC at $\sqrt{s}=7$ TeV and at RHIC at $\sqrt{s}=200$ GeV is studied now
at unprecedented multiplicities at $\sqrt{s}=13$ TeV.
The new measurement,... -
Astrid Vauthier (Centre National de la Recherche Scientifique (FR))07/02/2017, 09:30
Among the probes used to investigate the properties of the Quark-Gluon Plasma, the measurement of the energy loss of high energy partons can be used to put constraints on energy loss models and to ultimately access medium characteristics (such as energy density or temperature). The study of two particle correlations allows to obtain very different constraints compared to the nuclear...
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Soeren Schlichting (University of Washington)07/02/2017, 09:50Initial State Physics and Approach to EquilibriumOral
We present an ab-initio approach to compute the longitudinal dependence of the initial state by including small-x evolution of the nuclear gluon distributions.
We extend the IP-Glasma model by consistently including JIMWLK rapidity evolution and compute event-by-event rapidity distributions of produced gluons and the early time energy momentum tensor as a function of space-time rapidity and... -
Dr Gojko Vujanovic (The Ohio State University)07/02/2017, 09:50
Bulk viscosity has recently been shown to play an important role in describing both photon [1] and hadron [2] observables at the Relativistic Heavy-Ion Cllider (RHIC) and the Large Hadron Collider (LHC). The presence of a temperature-dependent bulk viscosity in the hydrodynamical evolution of the medium modifies the development of the hydronynamic momentum anisotropy differently in the high-...
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Carlota Andres Casas07/02/2017, 09:50
The final goal of the jet quenching studies is to extract medium parameters that characterize the QGP formed in high-energy nuclear collisions. In our analysis, we combine event-by-event hydrodynamics, within the EKRT formulation, with jet quenching (ASW Quenching Weights) to obtain high-$p_T$ $R_{AA}$, $v_2$ and $v_3$ for charged particles at RHIC and LHC energies for different...
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Vytautas Vislavicius (Lund University (SE))07/02/2017, 09:50
The study of identified particle production as a function of the proton-proton (pp) collision energy and multiplicity
is a key tool for understanding similarities and differences between small and large interacting systems.
We report on the production of pions, kaons, protons, K$^{0}_{\rm S}$, $\Lambda$, $\Xi$, $\Omega$, K$^{*0}$ and $\phi$ measured in pp collisions for $\sqrt{s}$ ranging... -
Krishna Rajagopal (Massachusetts Inst. of Technology (US))07/02/2017, 10:40
Within the context of a hybrid strong/weak coupling model of jet quenching, we study the
modification of the angular distribution of the energy within jets in
heavy ion collisions, as partons within jet showers lose energy
and get kicked as they traverse the strongly coupled plasma
produced in the collision. To describe
the dynamics transverse to the jet axis, we add
the effects of... -
Marie Germain (Subatech, IN2P3-CNRS (FR))07/02/2017, 10:40
Direct photon measurement in heavy-ion collisions provides a valuable set of observables to study the hot QCD medium since these photons are
produced at different stages of the collision and escape the medium unaffected. In pp collisions,
the direct photon yield at high transverse momentum ($p_T$) are produced in hard scattering (prompt photons),
but also in the fragmentation of high $p_T$... -
Ron Belmont (University of Colorado Boulder)07/02/2017, 10:40
Understanding the longitudinal dependence of flow harmonics and possible event plane decorrelations is an important part of properly extracting information on the matter created in heavy ion collisions. Asymmetric systems, by their nature, provide unique insight on the relation between geometry, transverse expansion, and longitudinal dynamics. In 2016, RHIC operations included $d$+Au beam...
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Elena Petreska (Nikhef/VU Amsterdam)07/02/2017, 10:40New Theoretical DevelopmentsOral
We study the various transverse-momentum-dependent (TMD) gluon distributions entering the cross section for forward di-jet production in dilute-dense collisions. For each TMD distribution we identify their operator definitions at small $x$ and finite $N_c$ as correlators of Wilson lines. With the result, we show the equivalence between the nearly back-to-back limit of the Color Glass...
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378. Charge asymmetry dependence of elliptic and triangular flow in pPb and PbPb collisions with CMSSang Eon Park (Rice University (US))07/02/2017, 11:00
In nucleus-nucleus collisions, the linear dependence found for the elliptic flow harmonic of both positive or negative charged particles as a function of event charge asymmetry ($A_{ch} = (N^{+} – N^{-})/(N^{+}+N^{-}) $, where $N^{+}$ and $N^{-}$ are the number of positive and negative charged particles, respectively) is predicted by the phenomenon known as the Chiral Magnetic Wave (CMW) due...
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Aleksas Mazeliauskas07/02/2017, 11:00Initial State Physics and Approach to EquilibriumOral
We use effective kinetic theory to simulate equilibration in heavy-ion collisions. We construct a map for out-of-equilibrium initial state to the energy-momentum tensor at a time when hydrodynamics becomes applicable. We apply this map to IPGlasma initial conditions and demonstrate a smooth transition to hydrodynamics. In a phenomenologically favorable range of $\eta/s$ values, equilibration...
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Deepali Sharma (Stony Brook University)07/02/2017, 11:00
PHENIX has discovered a large yield of low momentum direct photons emitted with large azimuthal anisotropy in 200 GeV Au+Au collisions. The large yield suggests early emission at high temperature, while the large anisotropy points towards late emission when the radial flow of the matter is fully developed, but the temperature is already reduced. This apparent contradiction poses a significant...
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Guang-You Qin (Central China Normal University)07/02/2017, 11:00
Dijet, dihadron, hadron-jet angular correlations have been reckoned as important probes of the transverse momentum broadening effects in relativistic nuclear collisions [1]. When a pair of high-energy jets created in hard collisions traverse the quark-gluon plasma produced in heavy-ion collisions, they become de-correlated due to the vacuum soft gluon radiation associated with the Sudakov...
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Jonah Bernhard07/02/2017, 11:20Collective DynamicsOral
A primary goal of heavy-ion physics is the measurement of the fundamental properties of the quark-gluon plasma (QGP) and the characterization of the initial state that leads to its formation.
While these properties—such as temperature-dependent transport coefficients—are not directly measurable, they may be quantitatively estimated through computational models of heavy-ion collisions.
The... -
Joel Anthony Mazer (University of Tennessee (US))07/02/2017, 11:20
In relativistic heavy-ion collisions at the Large Hadron Collider (LHC), conditions are met to produce a hot, dense and strongly interacting medium known as the Quark Gluon Plasma (QGP). Quarks and gluons from incoming nuclei collide to produce partons at high momenta early in the collision. By fragmenting into collimated sprays of hadrons, these partons form "jets". Within the framework of...
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Adam Trzupek (Institute of Nuclear Physics Polish Academy of Sciences (PL))07/02/2017, 11:20
ATLAS measurements of two-particle correlations in $\Delta\phi$ and $\Delta\eta$ and multi-particle azimuthal correlations using four, six and eight-particle cumulants are presented for $pp$, $p$+Pb and low multiplicity Pb+Pb collisions.
For the two-particle correlations, a template fitting procedure is used to subtract the dijet contribution and to extract the genuine
long-range ridge... -
Kazunori Itakura (KEK)07/02/2017, 11:20
We discuss photon emission at the stage of hadronization as a possible resolution to the direct-photon puzzle. In an ordinary plasma, it is well known that photon emission occurs when a plasma goes back to a normal state through recombination processes such as $e^- + p^+ \to H + \gamma$ for an electron-proton plasma. This is called the “radiative recombination”. A similar process should take...
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Naoto Tanji (Heidelberg University)07/02/2017, 11:40
Large scale classical statistical simulations confirm [1] that the correct kinetic theory describing the off-equilibrium Glasma is the "bottom-up” thermalization scenario [2]. Detailed simulations demonstrate that the bottom-up results match on to relativistic viscous hydrodynamics on time scales of order 1 Fermi for realistic values of the coupling [3]. We explore the detailed implications of...
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Radim Slovak (Charles University (CZ))07/02/2017, 11:40
Jets are an important tool to study the hot, dense matter produced in Pb+Pb collisions at the LHC.
Due to the loss of some of the jet’s energy outside the jet cone, jet rates have been found to be reduced by approximately a factor of two, in the most central events and over a wide kinematic range. In order to understand precisely how the jets are modified, it is important to measure how the... -
Dr Edmond Iancu (IPhT Saclay)07/02/2017, 11:40Initial State Physics and Approach to EquilibriumOral
The study of particle production in proton-nucleus ($pA$) collisions provides essential
information about high-density effects (like gluon saturation) in the nuclear wavefunction and offers a benchmark for the corresponding studies in nucleus-nucleus collisions. The cross-sections for particle production in $pA$ can in principle be computed within perturbative QCD, using the framework of the... -
Julia Velkovska (Vanderbilt University (US))07/02/2017, 11:40
Results on elliptic flow in p+p and p/d/$^3$He+A have raised the question of how small a system can be while still exhibiting collective behavior. In 2016, RHIC operations included $d$+Au collisions at 200, 62.4, 39, and 19.6 GeV. In this talk we present results on elliptic and triangular flow at midrapidity as a function of transverse momentum and event multiplicity in $d$+Au collisions at...
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Jasmine Brewer (MIT)07/02/2017, 12:00
Recently our group analyzed how the probability distribution for the jet
opening angle is modified in an ensemble of jets that has propagated
through an expanding cooling droplet of plasma [1]. Each jet in the
ensemble is represented holographically by a string in the dual 4+1-
dimensional gravitational theory with the distribution of initial energies and
opening angles in the ensemble given... -
Koji Kawaguchi07/02/2017, 12:00
Recent observation of collective-flow-like behaviors in small colliding systems
attracts significant theoretical and experimental interests.
In large colliding systems,
large collective flow has been interpreted as manifestation of almost-perfect
fluidity of the quark gluon plasma (QGP).
So it is quite intriguing to explore how small
the QGP can behave as a fluid.In this...
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Christian Holm Christensen (University of Copenhagen (DK))07/02/2017, 12:00Initial State Physics and Approach to EquilibriumOral
The dependence of particle production on the size of the colliding system (pp, p-Pb, and Pb-Pb) is studied using the most recent measurements at $\sqrt{s_{\rm{NN}}}=5.02~\rm{TeV}$ from ALICE for -3.4 < η < +5.0 employing the same methodology for the three colliding systems. Comparing particle production between Pb-Pb and p-Pb collisions to pp collisions as a reference over a wide...
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Prof. Gordon Baym (University of Illinois)07/02/2017, 12:00
The polarization of direct photons
produced in an ultrarelativistic heavy-ion collision reflects the
anisotropy of the quark-gluon plasma created in the collision. We describe a general framework, based on the photon spectral functions in the plasma, for analyzing the angular distribution and thus the polarization of dileptons in terms of the plasma anisotropies. The rates of dilepton... -
Yi Chen (CERN)07/02/2017, 14:00
We present recent results on measurements of jet substructures using grooming techniques with pp and PbPb data collected with the CMS detector at a center-of-mass energy of 5.02 TeV per nucleon pair. The grooming technique is used to focus on the hard structure of the jet by extracting the two subjets which correspond to the hardest parton splitting. This allows us to study medium-induced...
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Dr Takahito Todoroki (Brookhaven National Laboratory)07/02/2017, 14:00
Quarkonium production is an important probe to study the properties of the Quark Gluon Plasma (QGP) formed in relativistic heavy-ion collisions. The suppression of J/ψ due to the color-screening effect in the medium was initially proposed as direct evidence of the QGP formation. However, the interpretation of J/ψ suppression is still challenging due to the regeneration contribution from the...
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Jacopo Ghiglieri (CERN (CH))07/02/2017, 14:00
Transport coefficients of QCD like the shear viscosity $\eta$ and the diffusion of baryon number $D$ have been determined at leading order in perturbation theory by Arnold, Moore and Yaffe (AMY). I will show how these transport coefficients are sensitive to $O(g)$ corrections arising from interactions with soft gluons. These NLO effects enter as corrections to the transverse momentum...
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Alexandru Florin Dobrin (CERN)07/02/2017, 14:00
Strong fluctuations of the elliptic flow in heavy ion collisions allow an efficient selection of the events corresponding to a specific initial geometry. This technique, Event Shape Engineering, was applied to select events corresponding to the
same centrality, but having very different values of elliptic flow. For those events, we present results on the centrality dependence of the... -
Tonatiuh Jimenez (Ruprecht-Karls-Universitaet Heidelberg (DE))07/02/2017, 14:20
ALICE at the Large Hadron Collider (LHC) provides unique capabilities
to study charmonium production at low transverse momenta. In the early
and hottest phase of nucleus-nucleus collisions the formation of a
Quark-Gluon Plasma (QGP) is expected. Several QGP induced effects,
such as the melting of charmonium states due to color screening and/or
a (re)combination of uncorrelated charm and... -
Prof. Sourendu Gupta (TIFR, Mumbai)07/02/2017, 14:20
We develop an effective field theory for QCD at finite temperature which takes into account the global symmetries of the problem, including the fact that Lorentz invariance is broken. We discuss regularization and fixing of parameters in the theory. Some of the predictions of the theory are presented, for example the curvature of the critical line. The degree of agreement between the...
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Prof. Xu-Guang Huang (Fudan University)07/02/2017, 14:20
The quark-gluon matter produced in relativistic heavy-ion collisions may contain local domains in which P and CP symmetries are not preserved. When coupled with an external magnetic field, such P- and CP-odd domains will generate electric currents along the magnetic field --- a phenomenon called the chiral magnetic effect (CME). Recently, the STAR Collaboration at RHIC and the ALICE...
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Kolja Kauder (Wayne State University)07/02/2017, 14:20
Within the overwhelming majority of models, light quark and gluon jet quenching in heavy ion collisions is described as resulting predominantly from pQCD-type gluon radiation, but details of the underlying mechanisms differ greatly. One key difference lies in the treatment of the Altarelli-Parisi, AP, splitting functions. While in some models, such as Q-PYTHIA, the splitting functions are...
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Javier Martin Blanco (Centre National de la Recherche Scientifique (FR))07/02/2017, 14:40
Charmonium production in PbPb collisions requires the inclusion of many phenomena to be understood, such as melting in the quark gluon plasma and statistical recombination, on top of cold nuclear matter effects (modifications of nPDFs, initial-state energy loss, nuclear break-up), better probed in pPb collisions. Final results on the relative J/$\psi$ and $\psi$(2S) modification, based on the...
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Prithwish Tribedy (Brookhaven National Lab)07/02/2017, 14:40
We present measurements of the charge-dependent, three-particle correlator \gamma=<cos(\phi1+\phi2-2\phi3)> and elliptic flow v2 in central and ultra-central U+U and Au+Au collisions at sqrt{sNN}=200 GeV from STAR. The difference \Delta \gamma = \gamma(like- sign)-\gamma(un-like sign) measures charge separation across the reaction plane, a predicted signal of the Chiral Magnetic Effect (CME)...
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Guilherme Teixeira De Almeida Milhano (Instituto Superior Tecnico (PT))07/02/2017, 14:40
The measurement of jet substructure provides important detailed information on the dynamics of the jet-QGP interaction. However, our ability to reliably extract such information is contingent on understanding the sensitivity of any given substructure observable to specific features of in-medium jet dynamics. Monte Carlo event generators with transparent physics content and that have been...
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Jana Günther (University of Wuppertal)07/02/2017, 14:40
We want to study thermodynamical observables at finite density. Since direct lattice simulations at finite muB are hindered by the sign problem an efficient way to study the QCD phase diagram at small finite density is to extrapolate observables from imaginary chemical potential. In this talk we present results on several observables for the equation of state. The observables are calculated...
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Alexander Rothkopf (Heidelberg University)07/02/2017, 15:00
Many precision measurements of quarkonium suppression at the LHC, e.g. the nuclear modification factor R_AA of J/Psi, are well described by a multitude of different models [1]. Thus pinpointing the underlying physics is difficult and first principles guidance is needed. In-medium spectral properties, e.g. mass shifts or the broadening of states can help us to understand quarkonium production...
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Jorge Andres Lopez Lopez (Federico Santa Maria Technical University (CL))07/02/2017, 15:00
The suppression of heavy charmonia states in heavy-ion collisions is a phenomenon understood as a consequence of QGP formation in the hot, dense system formed in heavy ion collisions at the LHC. In addition to hot matter effects in heavy-ion collisions , cold nuclear effects may also affect heavy charmonia production . Therefore, a full assessment requires detailed studies on the effects...
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Konrad Tywoniuk (CERN)07/02/2017, 15:00
The modifications of jets in heavy-ion collisions are manifest in many measurements. However, inclusive observables are generally susceptible to the quantum mechanical nature of interactions of the jet fragments with the medium. We argue that contemporary jet substructure techniques facilitate a more direct measurement of the radiative mechanism caused by medium interactions. As a concrete...
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Zhoudunming Tu (Rice University (US))07/02/2017, 15:00
Charge-dependent azimuthal correlations relative to the event plane in AA collisions have been suggested as providing evidence for the chiral magnetic effect (CME) caused by local strong parity violation. However, the observation of the CME remains inconclusive because of several possible sources of background correlations that may account for part or all of the observed signals. This talk...
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Martin Spousta (Charles University)07/02/2017, 15:20
In relativistic heavy ion collisions, a hot medium with a high density of unscreened color charges is produced. Jets are produced at the early stages of this collision and are known to become attenuated as they propagate through the hot matter. One manifestation of this energy loss is a lower yield of jets emerging from the medium than expected in the absence of medium effects. ATLAS has...
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Mohamad Tarhini (Universite de Paris-Sud 11 (FR))07/02/2017, 15:20
ALICE is the LHC experiment dedicated to the study of ultra relativistic
heavy-ion collisions where the formation of a hot and dense
strongly-interacting medium, a Quark-Gluon Plasma (QGP), is expected.
Considerable theoretical and experimental efforts have been invested in
the last 30 years to study the properties of the QGP. One of the signals
of QGP formation is the charmonium... -
Shuzhe SHI (Indiana University)07/02/2017, 15:20
Abstract:
Chiral Magnetic Effect (CME) is the macroscopic manifestation of the fundamental chiral anomaly in a many-body system of chiral fermions, and emerges as anomalous transport current in hydrodynamic framework. Experimental observation of CME is of great interest and significant efforts have been made to look for signals of CME in heavy ion collisions. Encouraging evidence of...
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Sayantan Sharma (BNL)07/02/2017, 15:20
The QCD Equation of State (EoS) is fundamental for our understanding of the properties
of strong-interaction matter at non-zero temperature and density. In view of the
upcoming Beam Energy Scan II program at RHIC, it is important to gain control
over the EoS in the entire range of chemical potentials ($\mu_B$) accessible at
RHIC, $0\le \mu_B/T \le 3$. This will provide crucial input for... -
Niklas Mueller (Heidelberg University)07/02/2017, 15:40
We present a first principles approach to study the dynamics of the Chiral Magnetic Effect and Chiral Magnetic Wave based on real-time lattice simulations with dynamical (Wilson and Overlap) fermions simultaneously coupled to color and electro-magnetic fields. We discuss how these techniques can be used to study the Chiral Magnetic Effect during the pre-equilibrium stage of a heavy-ion...
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Davide Caffarri (CERN)07/02/2017, 15:40
The heavy-ion physics program at the LHC aims at characterizing the high energy density, high temperature, deconfined partonic state of matter called Quark-Gluon Plasma (QGP). High-momentum partons, that then hadronize in jets, are useful tools to study the QGP properties since they are produced via hard scattering processes and they probe the full evolution of the system, losing energy while...
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Peter Petreczky (BNL)07/02/2017, 15:40
For theoretical understanding of quarkonium production in heavy ion collisions
it is important to know the potential between the heavy quark and anti-quark
at non-zero temperature. This potential is complex and provides an efficient
way to calculate quarkonium spectral functions at non-zero temperature and
an important input for dynamical models aiming to describe quarkonium
production... -
Attila Pasztor (Wuppertal University)07/02/2017, 15:40
We study the thermodynamics of the quark gluon plasma with
lattice simulations in the continuum limit up to 1 GeV
temperature where we show that a perturbative description
already applies. We calculate the effect of the presence
of charm quark in the equation of state and also describe
the topological features of quantum chromodynamics.
The talk is based on the paper 1606.07494 (Nature, in press). -
Dr Antoine Lardeux (University of Oslo (NO)), Indranil Das (Saha Institute of Nuclear Physics (IN))07/02/2017, 16:30
The production of heavy quarkonia is an important observable to study the
properties of the nuclear matter created in high-energy heavy-ion
collisions. Lattice QCD calculations predict a phase transition of the
hadronic matter to a deconfined medium of quarks and gluons, the Quark
Gluon Plasma (QGP), at extreme energy densities. The bottomonium bound
states while passing through the deconfined... -
Jian Sun (Purdue University (US))07/02/2017, 16:30
The measurement of heavy flavour production is a powerful tool to study the properties of the high-density QCD medium created in heavy-ion collisions as heavy quarks are sensitive to the transport properties of the medium and may interact with the QCD matter differently from light quarks. In particular, the comparison between the nuclear modification factors ($R_{AA}$) of light- and...
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Veronica Dexheimer (Kent State University), Verônica Dexheimer (Kent State University)07/02/2017, 16:30Baryon-Rich QCD Matter and AstrophysicsOral
As the density of matter increases, atomic nuclei disintegrate into nucleons and, eventually, the nucleons themselves disintegrate into quarks. The phase transitions (PTs) between these phases can vary from steep first order phase transitions to smooth crossovers, depending on certain conditions. First order phase transitions with more than one globally conserved charge, so-called...
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Liwen Wen07/02/2017, 16:30
The chiral magnetic effect (CME) and the chiral vortical effect (CVE)
have been under intensive theoretical and experimental investigations in
recent years [1]. A three-point correlator, γ [2], has been used to measure electric/baryonic charge separations across the reaction plane as the
experimental manifestation of the CME/CVE. Considerable background
sources arising from charge/momentum... -
Chad Steven Flores (University of California Davis (US))07/02/2017, 16:50
Bottomonia are important probes of the quark-gluon plasma since they are produced at early times and propagate through the medium, mapping its evolution. They are also considered to be cleaner probes than charmonia due to the lack of regeneration even at the LHC energies. In Run 1 at the LHC, CMS was able to explore multiple measurements of the Y(nS) states in pp and PbPb collisions, down to...
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Anastasia Maria Barbano (Universita e INFN Torino (IT))07/02/2017, 16:50
Hadrons carrying heavy flavour (charm or beauty quarks) constitute an exceptional probe to study the properties of the Quark-Gluon Plasma (QGP) created in high-energy heavy-ion collisions. Heavy quarks are produced in initial hard parton-scattering processes of the nucleon-nucleon collisions and on short time scales compared to the QGP formation time. Therefore they experience the entire...
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Isaac Upsal (Ohio State University)07/02/2017, 16:50
Non-central heavy-ion collisions have large ($\sim 10^{5} \hbar$) angular momentum which may be transferred, in part, to the quark-gluon plasma through shear forces that generate a vortical substructure in the hydrodynamic flow field. The vortical nature of the system is expected to polarize emitted hadrons along the direction of system angular momentum. $\Lambda$ and $\overline{\Lambda}$...
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Jussi Auvinen (Duke University)07/02/2017, 16:50Baryon-Rich QCD Matter and AstrophysicsOral
Significant progress has been made in the past few years in determining QGP properties, such as the temperature dependence of shear viscosity over entropy density ratio $\eta/s$. However, $\eta/s$ might depend also on the baryochemical potential $\mu_B$, as has been hinted at in a recent beam energy scan study [1].
It is generally difficult to determine the uncertainties associated with the...
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Ning Yu (Central China Normal University CCNU)07/02/2017, 17:10Baryon-Rich QCD Matter and AstrophysicsOral
Light nuclei have much smaller binding energy compared to the temperature of the system. Consequently, their distributions can be used to probe the freeze-out properties, such as correlation volume and local baryon density of the medium created in high-energy nuclear collisions.
In this talk, we report the results of deuteron and anti-deuteron production in Au-Au collision at...
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Liang He (Purdue University)07/02/2017, 17:10
Due to their large masses, heavy quarks are predominantly produced through initial hard scatterings in heavy-ion collisions and, as such, they experience the entire evolution of the hot and dense medium created in such collisions. Therefore, they can provide important insights into the properties of the strongly-coupled Quark Gluon Plasma (sQGP). For instance, the azimuthal anisotropy of...
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Michael Andreas Winn (Universite de Paris-Sud 11 (FR))07/02/2017, 17:10
The LHCb experiment has the unique property to study heavy-ion interactions in the forward region (2 < $\eta$ < 5), in a kinematic
region complementary to the general purpose detectors. The detector has excellent capabilities for reconstructing quarkonia and open charm states, including baryons, down to zero $p_T$. Notably, it can separate the prompt and displaced charm components. In pPb... -
Iurii Karpenko (Frankfurt Institute for Advanced Studies)07/02/2017, 17:10
The Quark Gluon Plasma formed in relativistic heavy ion collisions at finite impact parameter has a finite angular momentum perpendicular to the reaction plane and some fraction thereof may be converted into global polarization of final state hadrons along the angular momentum direction. The polarization can be calculated assuming that the spin degrees of freedom are at local thermodynamical...
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Koichi Hattori (Fudan University)07/02/2017, 17:30
Both strong magnetic field and sizable vorticity are present in the hot QCD matter created in non-central heavy-ion collisions. We report new phenomena that the interplay between the magnetic field and fluid vorticity induces the redistribution of the vector charge density and generates an axial current [1]. We show the role of the chiral anomaly underlying in these effects which, however,...
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Long Zhou (USTC && BNL)07/02/2017, 17:30
Quark coalescence has been proposed as a new hadronization mechanism to explain the Number-of-Constituent-Quark scaling for meson/baryon elliptic flow as well as the enhancement in baryon-to-meson ratios in heavy ion collisions in the intermediate $p_{T}$ range (2$<$$p_{T}$$<$6 GeV/c) for both light and strange flavor hadrons. If the coalescence mechanism also plays a significant role for...
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Dr Hiroshi Ohno (Center for Computational Sciences, University of Tsukuba)07/02/2017, 17:30
Quarkonium spectral functions have all information about in-medium properties of heavy quarkonia such as dissociation temperatures, which are important to understand suppression of quarkonium yields in relativistic heavy ion collision experiments at RHIC and LHC, where many interesting results on $J/\Psi$ and $\Upsilon$ suppression have been reported already. Since quarkonium suppression can...
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Dr Sedigheh Jowzaee (Wayne State University)07/02/2017, 17:30Baryon-Rich QCD Matter and AstrophysicsOral
Rapidity correlations in the RHIC Beam Energy Scan.
Sedigheh Jowzaee for the STAR Collaboration
ajowzaee@wayne.eduA pair-normalized two-particle covariance versus the rapidity
of the two particles, called R$_2$, was originally studied
[1] in ISR and FNAL data in the 1970's and has recently seen
renewed interest [2] to study the dynamics of heavy-ion
collisions in the longitudinal... -
Dr Chun Shen (Brookhaven National Laboratory)07/02/2017, 17:50
Using a hybrid (viscous hydrodynamics + hadronic cascade) framework, we model event-by-event bulk dynamics of relativistic heavy-ion collisions at the Relativistic Heavy Ion Collider (RHIC) Beam Energy Scan (BES) collision energies, including the effects from non-zero net baryon current and its dissipative diffusion during the evolution. This framework is in full (3+1)D, which allows us to...
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Dr Long-Gang Pang (Frankfurt Institute for Advanced Studies, Goethe University)07/02/2017, 17:50
We computed the fermion spin distribution and correlations in vortical fluid employing event-by-event (3+1)D viscous hydrodynamics. Due to spin-vorticity coupling, the spin polarization density is proportional to the local fluid vorticity at the next-to-leading order of a gradient expansion in a quantum kinetic theory. As a result of strong collective flow, the spatial distribution of local...
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Emilie Amandine Maurice (University of Liverpool (GB))07/02/2017, 17:50
Open and hidden charm production in nucleus-nucleus collisions is
considered as a key signature of Quark Gluon Plasma (QGP) formation.
In the search of specific QGP effects, proton-nucleus collisions are used as
the reference as they account for the corresponding Cold Nuclear Matter
(CNM) effects.The LHCb experiment, thanks to its System for Measuring
Overlap with Gas (SMOG) can be operated in... -
ZAOCHEN YE (UNIVERSITY OF ILLINOIS AT CHICAGO)07/02/2017, 17:50
Measurements of quarkonium production have played an important role in understanding the properties of the Quark-Gluon Plasma (QGP) formed in relativistic heavy-ion collisions. The suppression of quarkonia in the medium due to color screening has been proposed as a direct signature of the QGP formation. However, other effects, such as regeneration of quarkonia by the coalescence of...
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Dr Michael Strickland (Kent State University)07/02/2017, 18:10
The thermal suppression of heavy quark bound states represents an ideal observable for determining if one has produced a quark gluon plasma in ultrarelativistic heavy-ion collisions. In recent years, however, a paradigm shift has taken place in the theory of quarkonium suppression due to new first principles calculations of the thermal widths of these states. These thermal widths are large, eg...
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Mr Xingyu Guo (Tsinghua University)07/02/2017, 18:10
We employed a 3+1D anomalous hydro with initial condition generated by HIJING to calculate Chiral Vortical Effect and Chiral Magnetic Effect. This allowed us to compare these two effects at different collision energy and centrality. We calculated the charge dependent two-particle correlations with respect to the reaction plane, which is used to compare with current results and also can provide...
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Shanshan Cao (Wayne State University)07/02/2017, 18:10
Hard hadrons, including heavy flavor and high $p_\mathrm{T}$ light flavor hadrons, serve as valuable probes of the quark-gluon plasma (QGP) matter produced in relativistic heavy-ion collisions. We establish a Linear Boltzmann Transport (LBT) coupled to (3+1)-D viscous hydrodynamic model that simultaneously describes the temporal evolution of both heavy and light partons inside QGP on the same...
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Chi Yang (USTC)07/02/2017, 18:10Future Experimental Facilities, Upgrades, and InstrumentationOral
The second phase of the Beam Energy Scan at RHIC, BES-II, is scheduled
for 2019-2020 and will explore with precision measurements the high baryon
density region of the QCD phase diagram. The program will examine the
energy regime of interest determined from the results of BES-I. Some of
the key measurements anticipated are: the kurtosis of net-protons that
could pinpoint the position of a... -
Zvi Citron (Weizmann Institute of Science (IL))08/02/2017, 08:30Initial State Physics and Approach to EquilibriumOral
W and Z bosons are short lived and do not participate in the strong interaction. Thus their production yields, observed via dilepton decay channels in proton-lead and lead-lead collisions, provide direct tests of both binary collision scaling and the nuclear modification of parton distribution functions (nPDF). Proton-lead collisions further provide a relatively clean environment for...
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Prof. Dmitri Kharzeev (Stony Brook University and BNL)08/02/2017, 08:30
Chiral anomaly induces a new kind of macroscopic quantum behavior in relativistic magnetohydrodynamics, including the chiral magnetic effect. In this talk we will present two new quantum effects present in fluids that contain chiral fermions:
1) the turbulent inverse cascade driven by the chiral anomaly; 2) quantized chiral magnetic current induced by the reconnections of magnetic flux. The... -
You Zhou (Niels Bohr Institute (DK))08/02/2017, 08:30
Theoretical calculations suggest that higher harmonic anisotropic flow vectors are superpositions of contributions from linear and non-linear hydrodynamic response, each reflecting different sensitivities to the fluctuating initial conditions and properties of the hot and dense matter created in heavy ion collisions [1].
In this talk, we present the first measurement on the non-linear...
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Peter Alan Steinberg (Brookhaven National Laboratory (US))08/02/2017, 08:30
Nuclear collisions which produce a high transverse momentum (p_T) prompt photon offer a useful way to study the dynamics of the hot, dense medium produced in these events. Because photons do not carry color charge, they are unaffected by the hot, dense medium. Thus, the outgoing photon serves as a tag of the initial parton flavors, and measures the initial parton pT before they are quenched...
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Diego Stocco (Centre National de la Recherche Scientifique (FR))08/02/2017, 08:50Electromagnetic ProbesOral
W and Z bosons are massive weakly interacting probes; insensitive to the strong interaction, they are clean observables of the initial state of heavy-ion collisions. Despite their low production rates, their relatively clean signatures in the leptonic decay channels allow their study in heavy-ion collisions at the LHC. Their measurement in p--Pb and Pb--Pb collisions provides constraints on...
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Shengquan Tuo (Vanderbilt University (US))08/02/2017, 08:50
Higher-order flow harmonics ($v_{n}$ with n $\gt$ 3) can be measured either with respect to the event plane of the same order, a lower order event plane, or a mixture of lower order planes (also called mixed higher-order harmonics). Studies of flow harmonics using the same order event plane have been used to extract the transport properties of the hot and dense medium produced in the...
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Robert Pisarski (BNL)08/02/2017, 08:50
We discuss the role of tetraquarks in the phase transitions of QCD. For three very
light flavors, tetraquarks may generate a second chiral phase transition. In
the plane of temperature and chemical potential ($T$ and $\mu$), tetraquarks must
be included in order to use effective models to determine the position of the critical
endpoint. The tetraquark condensate is the (color... -
Amit Kumar (Wayne State University)08/02/2017, 08:50
We take a closer look at the single particle nuclear modification factor ($R_{AA}$) and azimuthal anisotropy ($v_{2}$) of
leading hadrons at high transverse momentum ($p_{T}$) at both RHIC and LHC collision energies. We focus on the
established reduction in the interaction measure $\hat{q}/T^{3}$ between RHIC and LHC, as discovered by the JET
collaboration. The centrality dependence of the... -
Redmer Alexander Bertens (University of Tennessee, Knoxville)08/02/2017, 09:10
Measurements of azimuthal anisotropic flow provide valuable information on the properties of the matter created in
heavy-ion collisions. In this talk we present the elliptic, triangular and quadrangular flow of inclusive and identified
charged particles measured in Pb-Pb collisions at $\sqrt{s_{\rm NN}} = 5.02$ TeV recorded by the ALICE detector.
This center of mass energy is the highest... -
akio ogawa (BNL)08/02/2017, 09:10Initial State Physics and Approach to EquilibriumOral
Our understanding of proton structure and of nuclear interactions at high energy would be advanced significantly with the definitive discovery of the gluon saturation regime. Forward particle production in hadron collisions at RHIC probes gluons at small x where gluon density is high and expected to reach the saturation regime. Until today the golden channel at RHIC to observe strong hints of...
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Ran Bi (Massachusetts Inst. of Technology (US))08/02/2017, 09:10
A typical approach to study the medium produced in heavy ion collisions is to understand the passage of elementary particles through it. As Z bosons and photons do not participate in the strong interaction, their correlation with jets within the same event is a clean probe of the medium-induced energy loss of (predominantly) quark jets. In this analysis, Z+jet and photon+jet correlations are...
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Peter Arnold (University of Virginia)08/02/2017, 09:10
When high-energy partons traversing a quark-gluon plasma lose energy via bremsstrahlung or pair production, the quantum duration of that splitting process is known as the formation time. For high energy, the formation time exceeds the mean free time for collisions with the medium, leading to a significant reduction in the splitting rate: the LPM effect. But there are interesting and...
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Dr Gokce Basar (University of Maryland, College Park)08/02/2017, 09:30
I will discuss a novel solution the sign problem which prevents first principle Monte-Carlo computations of QCD at finite chemical potential (especially important for both the search for the critical point and neutron star physics) as well as real time quantities such as transport coefficients. The solution is based on deforming the region of integration in the path integral into a complex...
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Fernando Gardim (Federal University of Alfenas)08/02/2017, 09:30
Recent measurements at the LHC involve the correlation of different azimuthal flow harmonics $v_n$. These new observables add constraints to theoretical models and probe aspects of the system that are independent of the traditional single-harmonic measurements such as 2-and multi-particle cumulants $v_n\{m\}$. Many of these new observables have not yet been measured at RHIC, leaving an...
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Kari J. Eskola (University of Jyvaskyla)08/02/2017, 09:30Initial State Physics and Approach to EquilibriumOral
We review the recent results from the event-by-event NLO pQCD + saturation + viscous hydrodynamics (EbyE NLO EKRT) model [1,2,3], where we perform a simultaneous analysis of LHC and RHIC bulk observables to systematically constrain the temperature dependence of the QCD matter shear viscosity-to-entropy ratio eta/s(T), and to test the initial state computation. In particular, we study the...
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Dr Hongxi Xing (Northwestern University / Argonne National Laboratory)08/02/2017, 09:30
Electroweak boson-tagged jet measurements provide a promising experimental channel to accurately study the physics of jet production and propagation in dense QCD medium. In this talk, we present theoretical predictions for the nuclear-induced attenuation $R^2_{AA}(V+J)$ of the differential cross section for photon-tagged and Z0-tagged jet production in heavy ion collisions, and provide...
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Scott McDonald (McGill University)08/02/2017, 09:50
In this work we use our state of the art IP-Glasma+MUSIC+UrQMD framework to systematically study a wide range of hadronic flow observables at 2.76 TeV and to make predictions at 5.02 TeV \cite{1609.02958}. In addition to the single particle spectra and anisotropic flow coefficients $v_n$, we study event-plane correlations, non-linear response coefficients $\chi_n$, and flow factorization...
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Mr Balthazar Peroutka (Iowa State University)08/02/2017, 09:50
Electromagnetic fields are generated in high energy nuclear collisions by spectator valence protons. These fields are traditionally computed by integrating the Maxwell equations with point sources. One might expect that such an approach is valid at distances much larger than the proton size and thus such a classical approach should work well for almost the entire interaction region in the case...
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Megan Elizabeth Connors (Yale University (US))08/02/2017, 09:50Future Experimental Facilities, Upgrades, and InstrumentationOral
The 2015 US Nuclear Physics Long Range Plan calls for a state-of-the-art jet and upsilon detector at RHIC, called sPHENIX, to study the microscopic nature of the QGP, complementing similar studies at the CERN LHC. The sPHENIX detector will provide precision vertexing, tracking and full calorimetry over pseudorapidity |eta| < 1.1 and full azimuth at the full RHIC collision rate, delivering...
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Dr Heikki Mäntysaari (Brookhaven National Laboratory)08/02/2017, 09:50Initial State Physics and Approach to EquilibriumOral
Exclusive vector meson production can be used to directly probe the gluon density of a hadron. Measuring the cross section differentially in transverse momentum transfer makes it possible to determine the transverse density profile (via coherent diffraction) and density fluctuations (incoherent diffraction) of the target hadron. This knowledge about the geometric fluctuations of the proton is...
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Scott Moreland (Duke University)08/02/2017, 10:40
Recent measurements of azimuthal particle correlations in small collision systems show striking simularities to flow signatures observed in gold-gold and lead-lead collisions, leading many to question if the origin of small system correlations is hydrodynamic in nature. The ensuing effort to construct a unified hydrodynamic model for small and large collision systems revealed new tension in...
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Katarina Gajdosova (University of Copenhagen (DK))08/02/2017, 10:40
Two- and multi-particle azimuthal correlations have proven to be an excellent tool to probe the properties of the Quark-Gluon Plasma created in Pb-Pb collisions.
Recently, the results obtained for multi-particle correlations has been interpreted as evidence for collectivity in the small pp and p-Pb collision systems providing new insights into the systems' fluctuating initial conditions.
In...
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Alina Czajka (McGill University)08/02/2017, 10:40
The shear and the bulk relaxation times are important ingredients of the second order hydrodynamics whose success in heavy ion phenomenology is unquestioned. Unlike viscosites themselves, field theoretical calculations of the relaxation times are hard to come by in literature, especially for the bulk relaxation time. In this work, we report two field-theoretical analyses involving the shear...
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Sergei Zharko (Peter the Great Saint-Petersburg Polytechnic University)08/02/2017, 10:40
A better understanding of the energy loss of partons in the quark-gluon plasma formed in the collisions of heavy ions can be gained by varying the collision system. Recent RHIC runs have provided Cu+Au and U+U collisions. Asymmetric Cu+Au collisions provide a system with similar energy density but different path lengths when compared to Au+Au with the same number of nucleon-nucleon collisions....
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Prof. Huichao Song (Peking University), Dr Lijia Jiang (Frankfurt Institute for Advanced Studies)08/02/2017, 11:00
The recent BES data of the energy dependent κσ^2 for net protons in Au+Au collisions presented large deviations from the statistical baselines at lower collision energies, and non-monotonic behavior at around 20 GeV, which indicates possible signals for the existence of the QCD critical point [1].
In our recent paper [2], we introduce a freeze-out scheme to the dynamical models near the...
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Michael Ryan Clark (Columbia University (US))08/02/2017, 11:00
Bose-Einstein correlations between identified charged pions are measured for $p$+Pb collisions at $\sqrt{s_{\mathrm{NN}}}$=5.02 TeV with the ATLAS detector with a total integrated luminosity of 28 $\mathrm{nb}^{−1}$. Pions are identified using ionization energy loss measured in the pixel detector. Two-particle correlation functions and the extracted three-dimensional source radii are presented...
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Adith Ramamurti (Stony Brook University)08/02/2017, 11:00
Magnetic monopoles are suggested to play an important role in strongly coupled quark-gluon plasma (sQGP) near the deconfinement temperature. Lattice studies show that near the confinement temperature, $T_c$, quark-gluon plasma (QGP) contains both electric and magnetic quasiparticles. Further studies of the behavior of these quasiparticles at and above $T_c$, such as those by Liao and Shuryak...
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Norbert Novitzky (Helsinki Institute of Physics (FI))08/02/2017, 11:00
Single particle production has proven to be a valuable tool to study heavy ion collisions. The observation of collective behavior in $p$+Pb at the LHC and $d$+Au RHIC has spurred speculation that a plasma is formed in small collision systems. Jet production in the same collisions at the LHC and RHIC has an anomalous centrality dependence if centrality is determined the same way as in large...
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Dr Yukinao Akamatsu (Osaka University)08/02/2017, 11:20
We develop a set of kinetic equations for hydrodynamic fluctuations which are equivalent to nonlinear hydrodynamics with noise. The hydro-kinetic equations can be coupled to existing second order hydrodynamic codes to incorporate the physics of these fluctuations, which become dominant near the critical point.
We first show that the kinetic response precisely reproduces the renormalization...
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Nima Zardoshti (University of Birmingham (GB))08/02/2017, 11:20
We report measurements of two jet shapes, the ratio of 2-Subjettiness to 1-Subjettiness ($\tau_2/\tau_1$) and the opening angle between the two axes of the 2-Subjettiness jet shape which correspond to the axes of the hardest splitting in the jet. Comparison of these two jet shapes in Pb-Pb and pp collisions highlights the role of coherence effects on jet quenching, in the presence of the QGP...
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Qiao Xu (Vanderbilt University (US))08/02/2017, 11:20
Recent measurements in small collisions systems at LHC and RHIC indicate that the particles produced in high-multiplicity collisions exhibit collective behavior very similar to that observed in large systems where QGP is formed. In large systems, it is well established that the final-state particle correlations arise from anisotropic pressure gradients in the initial state of the collisions...
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Matthew Luzum08/02/2017, 11:20
We study elliptic and triangular flow and their dependence on rapidity using 3+1D hydrodynamic simulations with initial conditions (Nexus) that contain realistic fluctuations in all 3 dimensions. We compare to experimental data from STAR and find that long range, two particle $v_3$ correlations agree reasonably well with measurements. We find that an apparent decrease of $v_3$ with...
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Zhenyu Chen (Rice University (US))08/02/2017, 11:40
Observation of long-range ridge-like correlations in high-multiplicity pp collisions opened up new opportunities for exploring novel QCD dynamics in small collision systems. Based on data collected in 2015 and 2016 with the CMS detector at the LHC, the second-order ($v_{2}$) and third-order ($v_{3}$) azimuthal anisotropy harmonics of $K_{s}^{0}$, $\Lambda$ and inclusive charged particles are...
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Azumi Sakai08/02/2017, 11:40
Fluctuations have been playing an important role in understanding observables
in high-energy nuclear collisions.
It is well known that
higher harmonics of azimuthal angle distribution, for example, can be attributed to
initial fluctuations of transverse profile from event to event.
In this presentation, we focus on thermal fluctuations
during hydrodynamic evolution of the system in the... -
Misha Stephanov (UIC)08/02/2017, 11:40
We extend hydrodynamics of a fluid with conserved charge to incorporate the phenomenon of critical slowing down -- an essential ingredient for describing the dynamics of QCD matter near the critical point. We develop the general formalism of hydrodynamics with additional critically slow mode extending the validity of hydrodynamics in critical regime. As an application we consider a simple...
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Prof. Yacine Mehtar-Tani (INT, University of Washington)08/02/2017, 11:40
A key feature of jet fragmentation in vacuum is colour coherence, which leads to angular ordering of the shower. Recent works have pointed out the importance of colour coherence for jets passing through QCD matter. The results are indicative of a reorganisation of the jet fragmentation in terms of resolved subjets each of which are affected independently by energy loss in the medium. We study...
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Yasuki Tachibana (Central China Normal University)08/02/2017, 12:00
We study modification of full jet structures in the quark-gluon plasma (QGP) medium including effect of the hydrodynamic medium response. The structures and energies of jets in heavy ion collisions are significantly modified by the processes involving strong interactions during the propagation through the QGP medium, i.e., collisional energy loss, $p_T$-broadening, and induced parton...
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Isobel Kolbe (University of Cape Town)08/02/2017, 12:00
Current pQCD calculations for the energy loss of a hard parton moving through a medium of thermalized static scattering centres are inapplicable to the small colliding systems (such as p/d +A) that have, in recent years, hinted at the presence of tiny droplets of QGP through the presence of collective behaviour, strangeness enhancement and quarkonium suppression. The well-known DGLV, ASW,...
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Dr Miguel Ángel Escobedo Espinosa (University of Jyvaskyla)08/02/2017, 12:00
We study the gluon distribution produced via successive medium-induced branchings
by an energetic jet propagating through a weakly-coupled quark-gluon plasma. We show that
under suitable approximations, the jet evolution is a Markovian stochastic process,
which is exactly solvable. For this process, we construct exact analytic solutions
for all the n-point correlation functions... -
Maria Paola Lombardo (INFN)08/02/2017, 12:00
We study QCD for temperatures up to about 500 MeV using the lattice
approach. We include two generations of dynamical quarks, with
physical strange and charm masses, which are known to be relevant in the explored
temperature range. Our lattice discretization - Wilson quarks with a twisted
mass term - has good chiral properties at a moderate computational
cost. The main focus is... -
Quan Wang (The University of Kansas (US))08/02/2017, 14:00
Studies of azimuthal anisotropies for very high $p_{T}$ particles in relativistic heavy ion collisions provide crucial information on the path length dependence of the parton energy loss mechanism in the quark-gluon plasma. Final high-precision data on the elliptic ($v_{2}$) and triangular ($v_{3}$) anisotropy harmonics of charged particles, obtained with the scalar product method, are...
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Kunsu Oh (Pusan National University (KR))08/02/2017, 14:00
Heavy flavor quarks have been suggested as excellent probes to study the Quark-Gluon Plasma (QGP) created in ultra-relativistic heavy-ion collisions. Significant suppression of open heavy flavor production at large tranverse momentum has been observed in Au+Au collisions relative to p+p collisions at $\sqrt{s_{NN}}$ = 200 GeV at RHIC. Such a suppression can be attributed to the energy losses...
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Anar Rustamov (National Nuclear Research Center (AZ))08/02/2017, 14:00
Fluctuations of conserved charges are interesting probes of critical phenomena and freeze-out conditions in strongly interacting matter. In this context, experimental results will be presented on event-by-event analysis of net baryon fluctuation measurements in Pb-Pb collisions at $\sqrt{s_{NN}}$=2.76 TeV, recorded by the ALICE Collaboration at the CERN LHC. In addition to net-protons, used as...
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Ms Heidi Schuldes (GU Frankfurt)08/02/2017, 14:00Baryon-Rich QCD Matter and AstrophysicsOral
Strangeness production in heavy-ion collision at energies below the free NN production threshold is an excellent tool to study medium properties of dense baryonic systems. For the first time, a nearly complete set of strange particles has been reconstructed in the 40% most central Au+Au collisions at $1.23 A$ GeV. The data sample includes multi-differential representations of charged and...
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Kathryn Meehan (UC Davis)08/02/2017, 14:20Baryon-Rich QCD Matter and AstrophysicsOral
The RHIC Beam Energy Scan (BES) Program was proposed to look for the turn-off of signatures of the quark gluon plasma (QGP), search for a possible QCD critical point, and study the nature of the phase transition between hadronic and partonic matter. The results from the NA49 experiment at CERN have been used to claim that the onset of deconfinement occurs at √(s_NN ) ≈7 GeV, the low end of...
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Roli Esha (University of California - Los Angeles)08/02/2017, 14:20
One of the main goals of the RHIC Beam Energy Scan program is to search for the QCD Critical Point (CP) and phase transition in heavy-ion collisions. Fluctuations of conserved quantities are highly sensitive to the correlation length, and are directly connected to the susceptibilities in the Lattice QCD. Therefore, they are ideal observables for finding the CP and phase transition...
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James Robert Castle (The University of Kansas (US))08/02/2017, 14:20
Event-by-event participant geometry fluctuations are studied by measuring the distributions of event-by-event flow harmonics $p(v_{n})$. Insight as to the nature of these fluctuations is obtained by calculating from $p(v_{n})$ the cumulants and moments associated with the event shape. Flow harmonic distributions in PbPb collisions at $\sqrt{s_{NN}} = 5.02$ TeV are measured for the integrated...
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Denise Aparecida Moreira De Godoy (Westfälische Wilhelms-Universität Münster)08/02/2017, 14:20
Heavy quarks, i.e. charm and beauty, are sensitive probes to study the properties of the strongly-interacting matter created in heavy-ion collisions at ultra-relativistic energies, since they are mainly produced in initial hard scattering processes and experience the entire evolution of the system.
The heavy quarks traversing the medium lose energy via collisional and radiative processes in... -
Christoph Blume (IKF, Uni-Frankfurt)08/02/2017, 14:40Baryon-Rich QCD Matter and AstrophysicsOral
HADES provides a large acceptance combined with a high mass-resolution and therefore allows to study dielectron and hadron production in heavy-ion collisions with unprecedented precision. With the high statistics of seven billion Au-Au collisions at $1.23 A$ GeV recorded in 2012 the investigation of high-order flow harmonics is possible. Multi-particle azimuthal correlation techniques can be...
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Frithjof Karsch (Brookhaven National Laboratory)08/02/2017, 14:40
Up to $6^{th}$ order cumulants of fluctuations of net baryon-number,
net electric charge and net strangeness as well as correlations among
these conserved charge fluctuations are now being calculated in lattice
QCD. These cumulants provide a wealth of information on the properties
of strong-interaction matter in the transition region from the low
temperature hadronic phase to the... -
Soumya Mohapatra (Columbia University (US))08/02/2017, 14:40
The collisions of lead nuclei provided by the LHC in Run 2 provide new opportunities to study matter produced at unprecedented temperatures and densities. In particular, the study of the azimuthal anisotropy of produced charged particles not only constrains the initial state of the nuclear collisions and soft particle collective dynamics, but also sheds light on jet quenching via the...
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Kurt Eduard Jung (University of Illinois at Chicago (US))08/02/2017, 14:40
The energy loss of jets in heavy-ion collisions is expected to depend on the mass and flavor of the initiating parton. Thus, measurements of jet quenching with identified partons place powerful constraints on the thermodynamic and transport properties of the hot and dense medium. We present recent result on heavy flavor jet spectra and nuclear modification factors of jets associated to charm...
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Adam Bzdak (AGH University of Science and Technology)08/02/2017, 15:00
We will discuss the relation between particle number cumulants and multi-particle correlation functions. It is argued that measuring couplings of the genuine correlation functions could provide cleaner information on possible non-trivial dynamics in heavy-ion collisions. We extract integrated multi-particle correlation functions from the presently available experimental data on proton...
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Akihiko Monnai (Institut de Physique Théorique, CNRS/CEA)08/02/2017, 15:00Baryon-Rich QCD Matter and AstrophysicsOral
Search for the conjectured QCD critical point is one of the major scientific goals for the Beam Energy Scan program at RHIC. The growth of the correlation length is a universal feature for systems near criticality, and observables which are most sensitive to the correlation length should be explored to identify signals of the QCD critical point.
Among all the first-order transport...
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Brian Cole (Columbia University (US))08/02/2017, 15:00
ATLAS measurements are presented on the production of muons from heavy-flavor decays in $\sqrt{s_{\mathrm{NN}}}$ = 2.76 TeV Pb+Pb collisions and $\sqrt{s}$ = 2.76 TeV $pp$ collisions at the LHC. The measurements are performed over the transverse momentum range 4 <$p_{\mathrm {T}}$< 14 GeV and over the 0-60% centrality interval. Backgrounds arising from in-flight pion and kaon decays, hadronic...
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Maya Shimomura (Nara Women's University (JP))08/02/2017, 15:00
Measurements of the azimuthal anisotropy coefficients ($v_n$) of particle emission are an established method to characterize the quark gluon plasma (QGP) generated in the high-energy heavy-ions collisions. An important early finding at RHIC was that hydrodynamic calculations can account for the measured anisotropy at low $p_{T}$ and relate them to the collision geometry. At higher $p_{T}$,...
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Mohammad Ahmad Saleh (Wayne State University (US))08/02/2017, 15:20
Azimuthally differential femtoscopic measurements, being sensitive to spatio-temporal characteristics of the source as well as to the collective velocity fields at freeze-out, provide very important information on the nature and dynamics of the system evolution. While the HBT radii modulations with respect to the second harmonic event plane reflect mostly the spatial geometry of the source,...
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Harri Niemi08/02/2017, 15:20Initial State Physics and Approach to EquilibriumOral
We present a derivation of anisotropic dissipative fluid dynamics from the moments of the Boltzmann equation based on an expansion around an arbitrary anisotropic single-particle distribution function [1]. We construct such an expansion in terms of polynomials in energy and momentum in the direction of the anisotropy and of irreducible tensors in the two-dimensional momentum space orthogonal...
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Kazuya Nagashima (Hiroshima University)08/02/2017, 15:20
Hadrons carrying heavy flavor (charm and bottom quarks) are a sensitive probe of the hot, dense medium created in high-energy nuclear collisions at RHIC because they are generated early in the reaction and subsequently propagate through the created matter.
The PHENIX experiment has measured inclusive open heavy flavor via the measurement of electrons from semi-leptonic decays of hadrons...
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Dr Yi Yin (MIT)08/02/2017, 15:20Baryon-Rich QCD Matter and AstrophysicsOral
Exploiting the universality between the QCD critical point and the three dimensional Ising model, closed form expressions derived [1] for non-equilibrium critical cumulants on the crossover side of the critical point reveal that they can differ both in magnitude and sign from equilibrium expectations. We demonstrate here that key elements of the Kibble-Zurek framework of non-equilibrium phase...
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Marlene Nahrgang (Subatech)08/02/2017, 15:40Correlations and FluctuationsOral
The search for the critical point of QCD is one of the main goals of the beam energy scan at RHIC and the CERN-SPS. In equilibrium, correlations diverge at the critical point leading to large event-by-event fluctuations in conserved quantities. For expanding systems like in heavy-ion collisions it is important to study the dynamical formation of long-range correlations in the critical region....
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Jinfeng Liao (Indiana University)08/02/2017, 15:40
Experimental data from heavy ion collisions at Relativistic Heavy Ion Collider (RHIC) and Large Hadron Collider (LHC) as well as first-principle lattice simulations, have provided rich information about the properties of the QCD plasma phase in the $1\sim 3 T_c$ regime. In particular, extensive jet energy loss measurements have allowed unique opportunity for probing the “internal working” of...
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Mingliang Zhou (State University of New York (US))08/02/2017, 15:40
Recently, theoretical and experimental studies of flow and multiplicity correlations in the longitudinal direction in heavy ion collision have revealed a rich dynamics not probed by traditional measurements that focused only on the transverse direction. Event-by-event longitudinal fluctuations in the initial conditions are expected to result in a strong asymmetry in particle multiplicities at...
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Dr Mauricio Martinez Guerrero (North Caroline State University)08/02/2017, 15:40
In this work we describe the dynamics of a highly anisotropic system undergoing a boost-invariant longitudinal and azimuthally symmetric radial expansion (Gubser flow) for arbitrary shear viscosity to entropy density ratio. We derive the equations of motion of dissipative anisotropic hydrodynamics by considering the moments method recently derived by Molnar et al. (MNR), Phys. Rev. D 93,...
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Prof. Vladimir Kekelidze (Joint Institute for Nuclear Research (RU))08/02/2017, 16:30Future Experimental Facilities, Upgrades, and InstrumentationOral
The project NICA (Nuclotron-based Ion Collider fAcility) is aimed to study hot and baryon rich QCD matter in heavy ion collisions in the energy range √s_NN = 4 - 11 GeV. The heavy ion program includes the study of collective phenomena, dilepton, hyperon and hypernuclei production under extreme conditions of highest baryonic density. This program will be performed with the MPD (MultiPurpose...
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Szabolcs Borsanyi (University of Wuppertal)08/02/2017, 16:30
We calculate higher order fluctuations of baryon number and electric charge in
lattice QCD. The results at real chemical potentials are obtained through
analytical continuation of simulations at imaginary chemical potentials. We
compare to (or discuss) the STAR proton and electric charge fluctuation data to
characterize the chemical freeze-out in view of the new lattice findings. -
Cesar Luiz da Silva (Los Alamos National Lab)08/02/2017, 16:30
Heavy quarks are useful probes of nuclear matter since at RHIC energies as they are produced only in initial parton collisions, and thus are sensitive to effects at all stages of the collisions. Because of their large mass, b quarks are expected to lose less energy through gluon radiation than lighter quarks. $J/\psi$ production from the $B \rightarrow J/\psi$ decay is a powerful observable...
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Jorge Noronha (University of Sao Paulo)08/02/2017, 16:30
Relativistic hydrodynamics is the main theoretical framework used to describe the quark-gluon plasma produced in ultra-relativistic heavy ion collisions and, possibly, proton-proton and proton-ion collisions. Therefore, understanding the physical assumptions that enter in the hydrodynamical modeling of heavy ion collisions is crucial. Especially, it is essential to elucidate the reason behind...
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Christoph Herold (Suranaree University of Technology)08/02/2017, 16:50
We study fluctuations of the sigma field and the net-baryon number on the crossover side of the critical point within the model of nonequilibrium chiral fluid dynamics (N$\chi$FD). Herein, the sigma field as the chiral order parameter is propagated explicitly and coupled to a fluid of quarks. Before investigating these fluctuations in an expanding nonequilibrium medium, we scrutinize the...
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David d'Enterria (CERN)08/02/2017, 16:50Future Experimental Facilities, Upgrades, and InstrumentationOral
This presentation will review the projected accelerator performance and the physics opportunities for a heavy-ion programme at FCC-hh [1]. In addition, the status of the FCC-hh detector design studies will be discussed.
The FCC-hh Design Study will assess the feasibility and potential of a hadron collider with a centre-of-mass of 100 TeV for pp collisions. The status of the project will be...
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Ta-Wei Wang (Massachusetts Inst. of Technology (US))08/02/2017, 16:50
Beauty production and phenomena in heavy-ion collisions are considered to be one of the key measurements to address the flavour-dependence of in-medium energy loss in PbPb collisions at the LHC. The CMS experiment has excellent capabilities for measuring b-quark production thanks to the excellent performances of its muon and tracker system, allowing the measurement of $D^{0}$ and J/$\Psi$...
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Nicolo Jacazio (Universita e INFN, Bologna (IT))08/02/2017, 16:50
In late 2015, the ALICE collaboration recorded data from Pb-Pb collisions at the unprecedented energy of $\sqrt{s_{\rm{NN}}} = 5.02$ TeV as well as reference data from pp collisions at the same energy. The $p_{\rm T}$-spectra of unidentified charged hadrons as well as of pions, kaons, protons, $\Lambda$, $\Xi$, $\Omega$, resonances and light (anti-)nuclei are presented.
Hydrodynamic and... -
Ester Anna Rita Casula (Universita e INFN, Cagliari (IT))08/02/2017, 17:10
Quantum Chromodynamics predicts the occurrence of a phase
transition from the hadronic matter to a plasma of deconfined quarks and gluons
(Quark-Gluon Plasma) at extreme conditions of temperature and energy density.
Ultrarelativistic heavy-ion collisions provide the means to study this phase of
matter in the laboratory.\
Strangeness production is a key tool to understand the properties
of the... -
Romain Holzmann (GSI)08/02/2017, 17:10Baryon-Rich QCD Matter and AstrophysicsOral
The strong rise towards lower collision energies of the fourth moment of the e-by-e net-baryon multiplicity distribution observed by the STAR collaboration has recently triggered high attention. In view of theoretical studies of critical phenomena in the QCD matter phase diagram, this could signal the existence of a critical point. To provide further experimental insight, an extension of the...
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Dr Sanghoon Lim (LANL)08/02/2017, 17:10
Despite intense theoretical and experimental investigation, the physical mechanisms governing the suppression of bound quark-antiquark states in nuclear collisions are not yet fully understood. While color screening in a plasma phase is expected to play a role, there are numerous other possible suppression mechanisms that do not require deconfinement, as well as effects on the heavy quark...
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Prof. Peter Senger (GSI)08/02/2017, 17:10Future Experimental Facilities, Upgrades, and InstrumentationOral
QCD matter physics at the future FAIR facility in Germany
Peter Senger (GSI) for the CBM Collaboration
Abstract
The Compressed Baryonic Matter (CBM) experiment will be one of the major scientific pillars of the future Facility for Antiproton and Ion Research (FAIR) in Darmstadt. The goal of the CBM research program is to explore the QCD phase diagram in the region of high baryon... -
Mr Caio Alves Garcia Prado (Universidade de Sao Paulo (BR))08/02/2017, 17:30
It has recently been argued that event-by-event fluctuations, choice in initial conditions, and proper calculations of $v_2\{2\}$ are necessary to resolve the long-standing $R_\text{AA}$ to $v_2\{2\}$ puzzle for high $p_T$ identified hadrons [1,2]. Here we investigate the effects of full event-by-event fluctuating hydrodynamic backgrounds on the nuclear suppression factor and flow harmonics...
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Gabriel Denicol (McGill University)08/02/2017, 17:30
While small at very high temperature, the bulk viscosity of quantum chromodynamics is expected to grow in the confinement region. Although its precise magnitude and temperature-dependence in the cross-over region is not fully understood, recent theoretical and phenomenological studies [1-5] provided evidence that the bulk viscosity can be sufficiently large to have measurable consequences on...
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Prof. Toru Kojo (Central China Normal University)08/02/2017, 17:30Baryon-Rich QCD Matter and AstrophysicsOral
We study neutron star matter equations of state at finite temperature for neutron star mergers and supernovae, including not only thermal quark fluctuations but also the Nambu-Goldstone modes. Our description is based on 3-window modeling in which nuclear matter at nB < 2n0 (nB:baryon density, n_0:saturation density) is smoothly connected to strongly correlated quark matter at nB > 5n0. Our...
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Takao Sakaguchi (BNL)08/02/2017, 17:30Future Experimental Facilities, Upgrades, and InstrumentationOral
The QCD phase diagram has been explored in the high temperature side at RHIC and LHC, while the high density side is barely explored. Systematic studies of the QCD matter from Bevalac to LHC energies have suggested that the highest density QCD matter can be reached around the AGS energies (sqrt(s_{NN})=~5-GeV) where a rich production of strange hadrons is expected.
The future heavy-ion...
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Yingru Xu (Duke University)08/02/2017, 17:50
Heavy quarks are considered as valuable probes of the quark-gluon plasma (QGP) created in ultra-realistic heavy-ion collisions. However, the simultaneous description of the heavy meson nuclear modification factor $R_{AA}$ and the elliptic flow $v_2$ poses a significant challenge for most commonly used transport modes, especially those based on Langevin transport. We propose a generalized...
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Dennis Bazow08/02/2017, 17:50
Local momentum anisotropies are large in the early stages of the quark-gluon plasma created in relativistic heavy-ion collisions, due to the extreme difference in the initial longitudinal and transverse expansion rates. In such situations, fluid dynamics derived from an expansion around an isotropic local equilibrium state is bound to break down. Instead, we resum the effects of the slowest...
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Richard Daniel Majka (Yale University (US))08/02/2017, 17:50Future Experimental Facilities, Upgrades, and InstrumentationOral
The ALICE TPC will undergo a major upgrade during the next LHC long shutdown in preparation for the higher luminosity planned for LHC Run-3 to start in 2021. This upgrade will allow ALICE to access new levels of sensitivity for untriggered processes. The present TPC is limited to recording minimum bias lead-lead collisions at a rate of about 1000 Hz. The upgrade will allow recording the...
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Eero Aleksi Kurkela (CERN)08/02/2017, 17:50
I will discuss the new state-of-the-art perturbative Equation of State of quark matter valid at all temperatures and chemical potentials. The new result is accurate to order g^5 in the gauge coupling, and is based on a novel framework for dealing with the infrared sensitive soft field modes of the theory. The zero Matsubara mode sector is treated using a dimensionally reduced effective theory,...
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Paul Romatschke (University of Colorado, Boulder)08/02/2017, 18:10
Experimental results on azimuthal correlations in high energy nuclear collisions (nucleus-nucleus, proton-nucleus and proton-proton) seem to be well described by viscous hydrodynamics. It is often argued that this agreement implies either local thermal equilibrium or at least local isotropy. In this note, I present arguments why this is not the case. Neither local near-equilibrium nor...
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Pierre Moreau (Frankfurt Institute of Advanced Studies)08/02/2017, 18:10Baryon-Rich QCD Matter and AstrophysicsOral
We study the effect of the chiral symmetry restoration (CSR) on heavy-ion collisions observables in the energy range $\sqrt{s_{NN}}$=3--20\,GeV within the Parton-Hadron-String Dynamics (PHSD) transport approach. The PHSD includes the deconfinement phase transition as well as essential aspects of CSR in the dense and hot hadronic medium, which are incorporated in the Schwinger mechanism for...
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Pol Gossiaux (Subatech)08/02/2017, 18:10
Heavy-flavor observables are excellent probes of the properties of the in-medium interactions, the medium properties and the degrees of freedom of the quark-gluon plasma created in heavy-ion collisions. Progressing toward a quantitative description, we describe, in EPOSHQ, the dynamics of heavy quark coupled systematically to the EPOS3 model: heavy-quarks are produced from the EPOS3 flux tube...
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Paolo Martinengo (CERN)08/02/2017, 18:10Future Experimental Facilities, Upgrades, and InstrumentationOral
The ALICE experiment will undergo a major upgrade during the next LHC Long Shutdown (LS2) scheduled in 2019-20 that will allow to study in detail the QGP properties exploiting the increased Pb-Pb luminosity expected during Run 3 and Run 4.
The replacement of the existing Inner Tracking System (ITS) with a completely new ultra-light high-resolution detector is one of the cornerstones within...
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Agnes Mocsy (Pratt Institute)08/02/2017, 18:30
Ágnes Mócsy is a theoretical physicist and professor of physics and astronomy at Pratt Institute, Brooklyn, NY. “Smashing Matters: Behind the Science Scene” is her first documentary film, looking behind the scenes of the build up of big science discussed at Quark Matter, revealing relationships, friendships, mentorships that develop as essential parts in the lives of scientists in the high...
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Li Yan (CNRS)09/02/2017, 09:00
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Alice Ohlson (Ruprecht-Karls-Universitaet Heidelberg (DE))09/02/2017, 09:30
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Bjoern Schenke (Brookhaven National Lab)09/02/2017, 10:00
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Dennis Perepelitsa (University of Colorado Boulder)09/02/2017, 10:30
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Helen Caines (Yale University)09/02/2017, 11:30
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Paul Sorensen (BNL)09/02/2017, 12:00
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Dr Olaf Kaczmarek (University of Bielefeld)09/02/2017, 12:30
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Hannah Petersen (Frankfurt Institute for Advanced Studies)09/02/2017, 13:00
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Leticia Cunqueiro Mendez (Westfaelische Wilhelms-Universitaet Muenster (DE))10/02/2017, 09:00
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Marta Verweij (CERN)10/02/2017, 09:30
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Dr Jacquelyn Noronha-Hostler (University of Houston)10/02/2017, 10:00
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Daniel Pablos (Universitat de Barcelona)10/02/2017, 10:30
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Sarah Campbell (Columbia University (US)), Sarah Campbell (Columbia University)10/02/2017, 11:30
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Jean-Francois Paquet (Stony Brook University)10/02/2017, 12:00
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Xin Dong (Lawrence Berkeley National Lab)10/02/2017, 14:00
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Vincenzo Greco (University of Catania)10/02/2017, 14:30
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Enrico Scomparin (INFN)10/02/2017, 15:00
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Ralf Rapp (Texas A&M University)10/02/2017, 15:30
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Qun Wang (University of Science and Technology of China)10/02/2017, 16:30
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Yuji Hirono (Brookhaven National Laboratory)10/02/2017, 17:00
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Hannu Paukkunen (University of Jyväskylä)10/02/2017, 17:30
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Dr Spencer Klein (LBNL)10/02/2017, 18:00
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Yu-ichiro Sekiguchi11/02/2017, 09:00
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Bo-Wen Xiao (Central China Normal University)11/02/2017, 09:30
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Jihye Song (Pusan National University (KR))11/02/2017, 10:00Oral
The measurement of resonances in ultra-relativistic heavy-ion collisions allows one to study the properties of the hadronic medium. Resonances with short lifetimes compared to the duration of the hadronic phase are good candidates to probe the interplay of particle re-scattering and regeneration in the hadronic phase, which result in a modification of the measured yield of resonances.
... -
Peng Huo (State University of New York (US))11/02/2017, 10:05Oral
Longitudinal dynamics has recently become a topic of great interest in the study of ultra-relativistic heavy ion collisions. Measurement of the longitudinal fluctuations of the flow harmonic coefficients $v_n$ and event-plane angles $Psi_n$ can provide a more complete picture of space-time evolution of the hot, dense medium formed in heavy ion collisions. Longitudinal flow decorrelations can...
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Gian Michele Innocenti (Massachusetts Inst. of Technology (US))11/02/2017, 10:10Oral
The study of beauty production in heavy-ion collisions is considered one of the key measurement to address the flavour-dependence of in-medium energy loss in PbPb collisions. In pPb collisions, studies of b-quark production can also provide insights into the relevance of cold nuclear matter effects in the heavy-flavour sector. The CMS experiment has excellent capabilities for measuring b-quark...
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Hiroshi Nakagomi (Tsukuba University), Mr Hiroshi Nakagomi (Tsukuba University)11/02/2017, 10:15Oral
Azimuthal anisotropies of particle production in high energy heavy ion collisions have proven to be an excellent tool for investigating the initial geometry and the bulk properties of the Quark Gluon Plasma (QGP). Azimuthal anisotropy, measured through Fourier coefficients v_n, have been measured at mid-rapidity and are used to constrain the initial geometry and viscosity-over-entropy ratio...
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Guannan Xie (LBNL/USTC)11/02/2017, 10:20Oral
Charm quarks, predominantly produced in the early stage of heavy-ion collisions, are believed to provide unique information on the hot and dense medium created in such collisions. At RHIC, an enhancement in baryon-to-meson ratios for light hadrons and hadrons containing strange quarks has been observed in central heavy-ion collisions compared to p+p and peripheral heavy-ion collisions in the...
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Xiaojian Du (Texas A&M University)11/02/2017, 10:25Oral
We study bottomonium production at RHIC and the LHC using a transport model including both suppression and regeneration mechanisms. The transport model utilizes a kinetic rate equation [1] to calculate the centrality dependence of the production yields, and a Boltzmann equation for transverse-momentum ($p_T$) spectra. It has been successful in describing and predicting charmonium data at SPS,...
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Alba Soto Ontoso (UGR/FIAS)11/02/2017, 10:30Oral
In this talk, based on arXiv:1605.09176, we present a microscopic realization of the hollowness effect observed in proton-proton scattering at $\sqrt s = 7$ TeV. The initial collision geometry proposed in our model could impact significantly the interpretation of data specially sensitive to it, like the eccentricities of proton-proton, proton-nucleus and nucleus-nucleus collisions.
The... -
Israel Portillo (University of Houston)11/02/2017, 10:35Oral
Currently at the Beam Energy Scan at RHIC experimental efforts are being made to find the QCD critical point. On the theoretical side, the behavior of higher-order susceptibilities of the net-baryon charge from Lattice QCD may allows us to estimate its position via Taylor expansion of the density of states at $\mu_B=0$. However, even if the series expansion continues to higher-orders, there is...
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William Zajc (Columbia University)11/02/2017, 11:10Oral
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11/02/2017, 11:40Oral
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11/02/2017, 11:50Oral
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11/02/2017, 12:00Oral
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11/02/2017, 12:15Oral
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Guannan Xie (LBNL/USTC)Poster
Charm quarks, predominantly produced in the early stage of heavy-ion collisions, are believed to provide unique information on the hot and dense medium created in such collisions. At RHIC, an enhancement in baryon-to-meson ratios for light hadrons and hadrons containing strange quarks has been observed in central heavy-ion collisions compared to p+p and peripheral heavy-ion collisions in the...
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Jakub Kvapil (Czech Technical University in Prague)Poster
Charm quarks are mainly created in hard processes at the beginning of the heavy-ion collisions and can be used as a tool to study properties of the Quark-Gluon Plasma (QGP). The modification to D-meson production in heavy-ion collision is sensitive to the energy loss of charm quarks in the QGP. The Heavy Flavor Tracker was installed at the STAR experiment in 2014 and enables the topological...
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Mr Sushanta Tripathy (Indian Institute of Technology Indore (IN))Poster
The study of short-lived hadronic resonances in heavy-ion collisions
provides information about strangeness production and the hadronic phase of the
system. Resonance measurements in pp collisions set the baseline to which heavy-ion collisions are compared as well as contribute to the understanding of particle
production mechanisms through comparison with different model predictions. At the... -
Songkyo Lee (Korea University (KR))Poster
A variety of effects modify the charmonium production in pPb collisions with respect to pp collisions, like modification of nPDFs, initial-state energy loss and nuclear break-up. The forward/backward ratio of the J/$\Psi$, previously measured by CMS, is particularly sensitive to such effects. However, both nPDF and initial-state energy loss should modify the ground and excited state in a...
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Cristina Terrevoli (Universita e INFN, Padova (IT))Poster
Heavy quarks (charm and beauty) are effective probes of the QCD matter formed in high-energy nuclear collisions. They are produced in hard partonic scattering processes occurring in the initial stage of the collisions, propagate through the medium and interact with its constituents. Therefore, they probe the entire evolution of the system.
The study of their production in pp collisions...
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Qian Yang (University of Science and Technology of China)Poster
Understanding $J/\psi$ meson hadroproduction has been a long-term effort both experimentally and theoretically. However, none of the existing theoretical models can successfully describe both $J/\psi$ transverse momentum ($p_{T}$) spectrum and the polarization. Furthermore, the composition of inclusive $J/\psi$ is complicated, including direct production via gluon fusion, parton...
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Greeshma Koyithatta Meethaleveedu (IIT- Indian Institute of Technology (IN))Poster
In the early stages of collisions, hard-scattering of the quarks and gluons from incoming nuclei results in the production of high momentum partons which fragment into collimated sprays of hadrons called ``jets". At lower transverse momenta where the event-by-event reconstruction of jets becomes difficult, their event averaged effect generates observable correlations, which have been studied...
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Maximiliano Puccio (Universita e INFN Torino (IT))Poster
In view of the LHC Run3 starting in 2021, the ALICE experiment is preparing a major upgrade including the construction of an entirely new inner silicon tracker (the Inner Tracking System) and a complete renewal of its Online and Offline systems.
During its Run3, LHC will deliver Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.5 TeV with a peak luminosity $L=6\times10^{27}\,cm^{-2}\,s^{-1}$...
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Eric Mannel (Brookhaven National Labs)Poster
sPHENIX is the next generation detector at the Relativistic Heavy Ion Collider (RHIC) designed to explore the properties of the quark-gluon plasma through measurements of jet properties and upsilon spectroscopy The detector consists of a 1.5T superconducting solenoid, tracking, electromagnetic and hadronic calorimeter with a high speed data acquisition system. The calorimeters use a common...
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Yaping Wang (Central China Normal University CCNU (CN))Poster
Heavy flavor quarks are dominantly produced from initial hard partonic scattering processes in high-energy nuclear collisions. Their interactions with nuclear medium are sensitive to the medium properties. The Heavy Flavor Tracker (HFT) has been successfully integrated into the STAR experiment at RHIC since early 2014. Based on the state-of-the-art Monolithic Active Pixel Sensor (MAPS)...
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Kazuhisa Okamoto (Nagoya University)Poster
Relativistic hydrodynamic simulations play a key role in exploring the QGP bulk property and the QCD phase transition from analyses of high-energy heavy-ion collisions at RHIC and LHC. From the intensive study based on relativistic viscous hydrodynamic models with event-by-event initial fluctuations, we can extract detailed information of the bulk feature of the QGP such as transport...
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Steven Rose (Texas A&M University)Poster
The Color Glass Condensate (CGC) formalism with event-by-event fluctuations in the transverse plane, when coupled to viscous relativistic hydrodynamics (e.g. IP Glasma+MUSIC), has led to excellent quantitative agreement with a large number of data sets from high energy nuclear collisions. Recently, some of us have worked out analytic expressions for event-averaged quantities in the CGC...
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Abhisek Sen (Georgia State University)Poster
The proposed sPHENIX experiment is designed to reconstruct jets in heavy-ion collisions at RHIC. A crucial component to reconstructing the energy of jets is the sPHENIX calorimeter system which includes electromagnetic and hadronic calorimeters. The hadronic calorimeter (HCal) is a sampling calorimeter with alternating layers of steel absorber and scintillating tiles. There is an inner and...
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Nicole ApadulaPoster
The suppression of neutral pion production in high-energy heavy-ion
collisions was one piece of evidence of parton energy loss in the hot
medium produced at RHIC and thus a convincing signature for the
Quark-Gluon Plasma (QGP). The p(d)+A system had previously been
considered as a baseline to study the cold nuclear matter effects that
are also present in A+A collisions but are difficult... -
Mr Zhidong Yang (Texas A&M University)Poster
We construct a blast wave model with viscous corrections by calculating the viscous stress tensor from the parameterized flow field in the Navier Stokes approximation. We then use statistical Bayesian analysis tools to extract the shear viscosity over entropy ratio at the kinetic freeze-out temperature T=T_fo from experimental data. Note that this approach is complementary to the existing...
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Ming Li (University of Minnesota, Twin Cities)Poster
Heavy ion collisions at extremely high energy, such as the top
energy at RHIC and the typical energy at LHC, exhibit the property of
transparency where there is a clear separation between the almost
net-baryon-free central rapidity region and the net-baryon-rich
fragmentation region. We calculate the net-baryon rapidity loss and
the nuclear excitation energy using the energy-momentum tensor... -
Robert Hambrock (University of Cape Town)Poster
We compute the suppression, angular, and rapidity distribution of single open heavy flavor and the momentum, angular, and rapidity correlations for pairs of open heavy flavor at RHIC and LHC from an AdS/CFT-based energy loss model. We quantitatively compare these strongly-coupled QGP predictions to the weakly-coupled QGP predictions of Nahrgang et al., PRC90 (2014) [arXiv:1305.3823]. In the...
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Zefang Jiang (CCNU)Poster
We generalize a previously known class analytic, exact solutions of relativistic, prefect fluid hydrodynamics for the new results of pseudorapidity distributions. These advanced results include a broad centrality range evolution in Cu+Cu, Au+Au, Pb+Pb at RHIC and LHC with a series of acceleration parameter $\lambda$. Based on advanced hydrodynamic energy density estimation which taking...
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David Horak (Czech Technical University (CZ))Poster
The powerful photon fluxes of relativistic nuclei provide a possibility
to study photonuclear and two-photon interactions in ultra-peripheral collisions (UPC)
where the nuclei do not overlap and no strong nuclear interactions occur.
Within Vector-meson Dominance Model (VDM), $\rho^0$ contribution prevails in QCD photon structure
function and gamma+A -> $\rho^0$ +A process in heavy-ion UPC... -
Christina DeveauxPoster
The High Acceptance Di-Electron Spectrometer (HADES) is located at GSI Darmstadt and aims at exploring the properties of matter at high baryon densities via high precision measurements of di-leptons and hadrons.
In this contribution, we discuss the potential of HADES to reconstruct direct photons from Au+Au collisions at 1.23 AGeV beam energy and present first results obtained from data...
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Justin Ewigleben (Lehigh University)Poster
The Beam Energy Scan (BES) program at the Relativistic Heavy-Ion Collider has shown hints of a critical point and first order phase transition at the BES energies. Key measurements for locating the critical point and determining the first order phase transition are limited by poor event plane resolution, limited statistics and a TPC-only centrality determination. Therefore, phase II of the BES...
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Tomoya HoshinoPoster
Direct photons in high-energy heavy-ion collisions are a good probe to understand the full space-time evolution of the collision. The PHENIX experiment measured direct photons in p+p, d+Au, and Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV and discovered thermal photons from Au+Au collisions with internal photon conversions. Recently PHENIX has reported thermal photon production with wide...
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Mr Joseph Adams (The Ohio State University)Poster
Effects related to the angular momentum of the mid-rapidity source created in a heavy ion collision are under intense study. While the angular momentum of the collision is completely determined by the impact parameter and the beam direction, the angular momentum of the mid-rapidity source may fluctuate event to event. We study these fluctuations in a Glauber calculation and with the UrQMD...
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Yifeng Sun (Texas A&M University)Poster
Using an anomalous transport model for massless quarks and antiquarks, we study the effect of magnetic field on the elliptic flows of quarks and antiquarks in relativistic heavy ion collisions. With initial conditions from a blast wave model and assuming that the strong magnetic field produced in non-central heavy ion collisions can last for a sufficiently long time, we obtain an appreciable...
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Xiao Tu (Columbia University (US))Poster
ATLAS measurements of correlations between particle pairs in relative azimuthal angle ($\Delta\phi$) and pseudorapidity separation ($\Delta\eta$) in $pp$ collisions at $\sqrt{s}$=2.76, 5.02 and 13~TeV, and in $p$+Pb collisions at $\sqrt{s_{\mathrm{NN}}}$=5.02~TeV are presented. Prior measurements have shown that in $pp$ collisions with a large multiplicity of produced particles, a long-range...
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Saehanseul Oh (Yale University (US))Poster
Longitudinal multiplicity correlations and longitudinal asymmetry studies in heavy-ion collisions have suggested a hint of some asymmetry in the initial geometry and its effects in the final state particle fluctuations. In addition to the expansion of the medium in the transverse direction, commonly quantified using Fourier coefficients ($v_{n}$), the initial geometry and resulting...
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Naoto Tanaka (University of Tsukuba (JP))Poster
Azimuthally differential HBT is a powerful tool for investigating the source shape at freeze out.
In heavy ion collisions, radial and anisotropic flow of the expanding medium have been observed.
These hydrodynamic expansions result in the deformation of the initial geometry.Studying the deformation of the source shape is important for investigating the dynamics of the system evolution.
In...
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Gian Michele Innocenti (Massachusetts Inst. of Technology (US))Poster
The study of beauty production in heavy-ion collisions is considered one of the key measurement to address the flavour-dependence of in-medium energy loss in PbPb collisions. In pPb collisions, studies of b-quark production can also provide insights into the relevance of cold nuclear matter effects in the heavy-flavour sector. The CMS experiment has excellent capabilities for measuring b-quark...
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Dr Haiwang Yu (New Mexico State University)Poster
Jets initiating from a B-quark (B-jet) are sensitive to the collisional energy loss of the quark when traversing through Quark Gluon Plasma (QGP). Among the light jet background, the rare B-jets can be identified by utilizing some characteristic B-hadron decay properties, such as its long lifetime and semi-leptonic decay modes. With the proposed sPHENIX detector at RHIC, we study a variety of...
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Christine Nattrass (University of Tennessee (US))Poster
Jet-hadron and di-hadron correlations are sensitive to the low momentum and large angle modifications induced by interactions with the medium and allow higher precision measurements than jet-by-jet measurements because the background can be determined by averaging over several jets. However, the combinatorial background has limited the precision of these measurements. The Zero Yield At...
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Yuncun He (Central China Normal University, Wuhan)Poster
The string melting version of a Multi-Phase Transport (AMPT) model
can reasonably describe the $dN/dy$ yields, $p_{T}$ spectra and
anistropic flows of pions and kaons at low $p_{T}$ in heavy ion
collisions at RHIC and LHC energies [1,2].
However, it failed to reproduce the $dN/dy$ and $p_{T}$ spectra of
baryons [2,3]. For example, it overestimates the proton yield at
mid-rapidity but... -
Oliver Werner Arnold (Technische Universitaet Muenchen (DE))Poster
Femtoscopy studies of protons and Lambda hyperons have been carried out in pp collisions at 7 TeV, as measured by the ALICE collaboration. Contrary to the more complex situation in heavy-ion collisions, the Lambda-proton femtoscopy measurement in pp collisions allows us to investigate the scattering parameters for the hyperon-nucleon pair as the source that characterises the emission of the...
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Mr Niseem Abdelrahman"Magdy" (Stony Brook University)Poster
We present recent STAR measurements of the anisotropic flow coefficients $v_n$ ($n = 1-6$) in Au+Au, Cu+Cu, Cu+Au collisions at $\sqrt{s_{NN}} = 200$~GeV and U+U collisions at $\sqrt{s_{NN}} = 193$~GeV and for Au+Au collisions spanning the full range of the first beam energy scan ($7 - 200$~GeV: BES-I). For a given beam energy, the differential $v_n$ measurements indicate acoustic scaling...
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Dr Subhash SinghaPoster
Resonances are excellent probes to understand the properties and evolution of the
QCD medium created in relativistic heavy-ion collisions.
Because of their short lifetime, resonances decay inside the
fireball and their decay daughters interact with particles present in the
medium. If the decay daughters are re-scattered
by other hadrons present in the medium, the resonance signal cannot
be... -
Péter Pósfay (Wigner Research Centre for Physics)Poster
We propose a novel technique, using the expansion of the effective potential in a base of harmonic functions, to study the Functional Renormalization Group (FRG) method at
finite chemical potential. Within this theoretical framework we determined the equation of state and the phase diagram of a simple model of massless fermions coupled to scalars through Yukawa-coupling at the zero-temperature... -
Joseph Atchison (Texas A&M University)Poster
The determination of transport coefficients plays a central role in characterizing hot and dense nuclear matter. In the present work we calculate the electric conductivity of hot hadronic matter by extracting it from the rho-meson spectral function, as its zero-energy limit at vanishing momentum. Recent calculations of the electric conductivity in hot nuclear matter have been performed in...
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Justin Thomas Blair (University of Texas (US))Poster
ALICE at the LHC is designed to explore the quark-gluon plasma (QGP) state resulting from high energy heavy-ion collisions. The ALICE Electromagnetic Calorimeter (EMCal) can be used to measure hard probes of the initial collision, including jets, high $p_T$ photons, neutral mesons ($\pi^0$, $\eta$, $\omega$), and electrons. For LHC Run 2 (2015-2018) an additional detector was installed on the...
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Michael Lomnitz (Kent State University)Poster
Heavy quarks are produced through initial hard scatterings in heavy-ion collisions, and are affected by the hot and dense medium throughout its evolution when propagating in the medium. Several models have predicted that fluctuations in the initial conditions, together with frequent interactions with the QGP medium could lead to a finite triangular flow $v_3$ for the $D^0$ meson.
We present... -
Yanfang Liu (TAMU)Poster
In heavy-ion collisions, properties of the created QCD matter highly depend on the collision geometry or ''centrality''. In A+A collisions, centrality is related to the size of the overlap region determined by the impact parameter. In p+A collisions, the term ''centrality'' is still taken to be a classification of the amount of activity in the collision, which, however, is not strictly related...
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Kun Jiang (University of Science and Technology of China)Poster
Jets are modified in relativistic heavy-ion collisions due to jet-medium interactions. Measurements of jet medium modifications have so far been obscured because of the large underlying anisotropic flow background. In this analysis we devise a method to subtract all orders of the flow background using data themselves. The flow background subtracted away-side jet correlation shape and width...
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Nuggehalli Ajitanand (State University of New York at Stony Brook)Poster
Metastable domains of topological charges in QCD can cause chirality
imbalance and, under the strong magnetic field present in heavy-ion
collisions, result in charge separation along the magnetic field, a
phenomenon called the Chiral Magnetic Effect (CME) [1]. Charge
separation can also be caused by intrinsic particle correlations coupled
with elliptic flow anisotropy, a major background for... -
Julius Maximilian Gronefeld (GSI - Helmholtzzentrum fur Schwerionenforschung GmbH (DE))Poster
We present the analysis of the transverse momentum ($\textit{p}_\text{T}$) spectra for primary charged particles as well as the nuclear modification factor ($\text{R}_\text{AA}$) in Pb--Pb collisions at $\sqrt{s_\text{NN}}=5.02\,\text{TeV}$, using the data collected in November 2015 by ALICE at the LHC. In addition, a new analysis of data at $\sqrt{s_\text{NN}}=2.76\,\text{TeV}$ will be...
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Austin Alan Baty (Massachusetts Inst. of Technology (US))Poster
Using the 5.02 TeV collision-energy per nucleon pair PbPb and pp LHC data of 2015, CMS measured the spectra of charged particles in the $0.5 < p_{T} < 400$ GeV (pp) and $0.7 < p_{T} < 400$ GeV (PbPb) transverse momentum ranges for central rapidities. The corresponding nuclear modification factors, $R_{AA}$, are measured is several bins of centrality, from the most central 0-5% to the...
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Mr Hanlin Li (Wuhan University of Science and Technology & Purdue University)Poster
Azimuthal anisotropy $v_2$ is a useful tool for the study of the properties of the quark-gluon plasma (QGP). Recent studies with parton transport models suggest, however, that the majority of light quark $v_2$ comes from the anisotropic escape of partons, not hydrodynamic flow [1-4]. Heavy quarks, produced by hard scatterings at early times in relativistic heavy ion collisions, are regarded as...
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Madhukar Mishra (Birla Institute of Technology and Science Pilani, Pilani Campus)Poster
Charmonium production is among the promising signatures for quark-gluon plasma
formation in relativistic heavy-ion collisions. Here we investigate hot-medium effects on the suppression of the $J/\Psi$ yields in Pb$+$Pb and p$+$Pb at $\sqrt{s_{NN}} = 5.02$ TeV in a model that encompasses screening of the real part of the potential, damping of the $c\bar{c}$ binding through the imaginary part,... -
Dr Sean Bartz (Macalester College)Poster
The AdS/CFT correspondence describes many features of non-perturbative QCD. A phenomenological approach called AdS/QCD uses a dilaton field to break conformal symmetry. This describes the linear confinement of hadronic spectra at zero temperature. Using an AdS-black hole metric allows for the study of the behavior of hadrons interacting with a hot, dense medium like the quark-gluon plasma.
We...
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Srimoyee Sen (University of Arizona)Poster
We study the shock waves in relativistic chiral matter. We argue that the conventional Rankine-Hugoinot relations are modified due to the presence of chiral transport phenomena. We show that the entropy discontinuity in a weak shock wave is quadratic in the pressure discontinuity when the effect of chiral transport becomes sufficiently large. We also show that rarefaction shock waves, which do...
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Shuai Yang (Brookhaven National Laboratory)Poster
Dileptons ($l^{+}l^{-}$) are produced in all the stages of the heavy-ion collisions, and escape with minimum interaction with the strongly interacting medium. Thus, $l^{+}l^{-}$ pair measurements play an essential role in the study of hot and dense nuclear matter, created in heavy-ion collisions. Recently, a significant excess of $J/\psi$ yield at very low transverse momentum ($p_{T}<0.3$...
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Zachariah Miller (University of Illinois at Chicago)Poster
COLD NUCLEAR MATTER EFFECTS ON NON-PHOTONIC ELECTRON PRODUCTION MEASURED IN p+Au COLLISIONS BY THE STAR EXPERIMENT
Zachariah Miller (UIC)
Due to their large masses, heavy flavor quarks are dominantly produced in initial hard parton scattering processes in high-energy heavy-ion collisions. They experience the full evolution of the strongly interacting Quark-Gluon Plasma (QGP) created in...
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Dr Haojie Xu (Peking University)Poster
Flow measurements in high multiplicity pp collisions at the LHC have indicated the
development of collective flow in the small systems created at the LHC energies. Using
the event-by-event viscous hydrodynamics+hadronic cascade hybrid model, iEBE-VISHNU,
with fluctuating initial conditions, we investigate the azimuthal correlations in pp collisions at $\sqrt{s}=7$ and 13 TeV with two- and... -
Xu Sun (Central China Normal University)Poster
Chirality is the only fundamental symmetry in the nuclear matter. The study of the vorticity and possible chiral vortical effect allows us to access this fundamental property of the hot and dense nuclear matter created in high-energy nuclear collisions, especially at the high baryon density region. Global polarization parameters of identified particles can be extracted from the azimuthal...
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Dániel Kincses (Eötvös Loránd University)Poster
The RHIC beam energy scan program allows us to investigate the phase-diagram of QCD matter. The nature of the quark-hadron transition can be studied through analyzing the space-time structure of the hadron emission source. One of the best tools to gain information about the source is the measurement of Bose-Einstein or HBT correlations of identical bosons. In our latest measurements, we...
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Prof. Hirotsugu Fujii (University of Tokyo)Poster
Field-complexification approaches to the sign problems in chiral models at finite chemical potential are examined analytically and numerically.
We apply the thimble integration method to the 1-dimensional Thirring model at finite chemical potential to show that the multi-thimble contributions with alternating signs are important to reproduce the crossover behavior. We also use the complex...
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Miguel Angel Lopez-Ruiz (Indiana University)Poster
Confinement and chiral phase transitions are remarkable nonperturbative phenomena emerging from QCD and QCD-like theories. A theoretical understanding of these transitions and their interrelations is of fundamental importance. While it is widely perceived that their dynamics arises from nontrivial topological configurations in Yang-Mills theories, a concrete and sophisticated realization of...
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Michael Tannenbaum (Brookhaven National Laboratory (US))Poster
Although it was demonstrated more than 13 years ago that the
increase in midrapidity $dN_{\rm ch}/d\eta$ with increasing centrality
of Au+Au collisions at RHIC was linearly proportional to the number
of constituent quark participants ($N_{qp}$) in the collision,
it was only in the last few years that generating the spatial positions of the
three quarks in a nucleon according to the... -
Weiyao Ke (Duke University)Poster
The description of asymmetric collision systems and longitudinal fluctuations in AA collisions requires a 3D initial condition model consistent with both large and small systems.
Particularly, longitudinal fluctuations lead to event plane decorrelations that impact both soft observables and hard-soft correlation calculations.In this work, T\raisebox{-0.5ex}{R}ETNo, a parametric initial...
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James Lawrence Nagle (University of Copenhagen (DK))Poster
The planned sPHENIX experiment is a major initiative and a key part of the future of heavy ion physics in the US. One of the key pillars of the planned physics program is detailed measurements of jets, which requires hadronic calorimetry over a large solid angle. The sPHENIX hadronic calorimeter (HCal) is a sampling calorimeter comprising alternating layers of steel absorber and plastic...
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Diogenes Domenicis Gimenez (Universidade de Sao Paulo (BR))Poster
Heavy quarks are widely used in measurements in ultra-relativistic heavy-ion collisions to provide information on the Quark-Gluon Plasma (QGP) properties. This is the case for all particles produced in hard scattering processes, that can be reconstructed in jets, since they are mainly produced before the complete medium formation and can interact with the plasma during its early stages and its...
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Mr Debojit Sarkar (Department of Atomic Energy (IN))Poster
Particle correlations in azimuth ($\varphi$) and pseudorapidity ($\eta$) difference are a powerful tool, widely used in all collision systems to study numerous sources of correlations. Examples include the collective behaviour of the QGP medium, jets, quantum statistics or Coulomb effects, conservation laws, and decays of resonances. In this talk, we report such measurements from ALICE with...
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Hao Qiu (Purdue University (US))Poster
Because of their large mass, heavy quarks are produced primarily at early stages of heavy-ion collisions, and therefore experience the full evolution of the system and carry information about the extent of thermalization of the QGP. Azimuthal anisotropy parameters ($v_n$) of charm and bottom hadrons provide unique information about the path length dependent interactions between heavy quarks...
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Jing Wang (Massachusetts Inst. of Technology (US))Poster
The measurement of heavy flavour production is a powerful tool to study the properties of the high-density QCD medium created in heavy-ion collisions as heavy quarks are sensitive to the transport properties of the medium and may interact with the QCD matter differently from light quarks. In particular, the comparison between the nuclear modification factors of light- and heavy-flavour...
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Miroslav Šaur (Nuclear Physics Institute of CAS)Poster
Heavy quarks are mainly produced by hard processes during the early stage of heavy-ion collisions and before the formation of the quark-gluon plasma (QGP). As most of the heavy quarks are expected to propagate through the medium during its evaluation, they can encode information on different stages of the medium. The D$^0$ meson is the lightest meson containing a charm quark. Measurement of...
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Andrea Festanti (Universita e INFN, Padova (IT))Poster
Heavy-flavour production in p--Pb collisions is sensitive to Cold Nuclear Matter (CNM) effects such as the modification of the nuclear Parton Distribution Functions (PDFs), initial-stage radiation or energy loss, and multiple scattering of partons in the nucleus. These initial-state effects can induce a significant modification of the heavy-flavour production at low momentum and their...
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Barbara Antonina Trzeciak (Utrecht University)Poster
Heavy charm quarks are produced dominantly in the initial stage of high-energy heavy-ion collisions. They take part in the whole evolution of the medium, interact with the produced Quark-Gluon Plasma (QGP) and lose energy due to collisional and radiative processes. Therefore, they serve as unique probes of the QGP transport properties. Charm quarks can be studied by measuring D mesons that...
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Alexander Jentsch (UT Austin)Poster
Two-particle correlations have been shown to be sensitive to the dynamics of heavy-ion collisions. In particular, angular correlations on relative azimuth and pseudorapidity provide novel information about jet-like and collective behavior in these collisions. They also provide independent measures of important physical quantities, such as the second-order harmonic coefficient ($v_{2}$), by...
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Patrick Huhn (Johann-Wolfgang-Goethe Univ. (DE))Poster
The ALICE experiment at the LHC is designed to investigate the properties of the Quark-Gluon Plasma by studying high energy pp, p-Pb and Pb-Pb collisions. The parton energy loss in the medium can be examined by measuring the production of charged particles and their nuclear modification factor at high transverse momentum. In ALICE, charged particles are measured with the Time Projection...
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Sk Noor Alam (Department of Atomic Energy (IN))Poster
The two-wave quark production scenario can be investigated experimentally by measurements of balance functions of identified particle pairs [1]. In this scenario, quark-antiquark pairs produced in the earlier stages of the collision are pulled apart due to collective effects, while pairs produced during hadronization are unlikely to separate. We present the measurements of such balance...
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Meijian Li (Iowa State University)Poster
We apply the time-dependent basis light-front quantization (tBLFQ) formalism, a Hamiltonian
approach which is suitable for non-perturbative problems to the deep inelastic scattering. We calculate the dipole cross section by explicitly evolving the quark-antiquark dipole in the field predicted by the Color Glass Condensate theory. Our formalism enables us to go
beyond Eikonal approximation and... -
Dr Jin Huang (Brookhaven National Lab)Poster
The sPHENIX Collaboration at RHIC is planning a major upgrade to the PHENIX experiment by constructing an entirely new spectrometer based on the former BaBar solenoid magnet that will enable a comprehensive study of jets and heavy quarkonia in relativistic heavy ion collisions. The calorimeter system of the sPHENIX experiment will cover an acceptance of ±1.1 units in pseudorapidity and full...
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Sourav Tarafdar (Vanderbilt University (US))Poster
The latest results on jets and heavy flavor by the LHC experiments demonstrate the need to explore complementary measurements at RHIC, providing lower energies and lower initial virtualities. The proposed sPHENIX detector at RHIC will explore the quark-gluon plasma by measuring jets, b-tagged jets, jet correlations and the three upsilon states. The sPHENIX detector will cover full azimuth and...
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Kenta Shigaki (Hiroshima University (JP))Poster
The ALICE detector is designed for study of Quark-Gluon Plasma in heavy ion collisions at the LHC. Major upgrades of the detector are planned before the LHC run 3 from 2021. Along with a much higher rate capability to fully utilize the luminosity to be delivered, ALICE will also have enhanced physics capabilities with new addition of detector components.
The Muon Forward Tracker (MFT) is...
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Christian Bourjau (University of Copenhagen (DK))Poster
Di-hadron correlations in relative azimuthal angle and over large pseudorapidity separations ($\Delta\eta$) recently revealed evidence for collectivity in the small collision systems of pp and p--Pb.
In this analysis we investigate the correlations between tracks in the Inner Tracking System and energy deposition in the Forward Multiplicity Detector (FMD) ($1.7<\eta<5$,...
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Nicholas Elsey (Wayne State University)Poster
Jets and their modifications due to partonic energy loss provide a powerful tool to study the properties of the QGP created in
ultrarelativistic heavy-ion collisions. For anti-$k_t$ jets with a resolution parameter $R=0.4$, previous
measurements of the di-jet asymmetry $A_J$ at STAR [1] indicate that the observed imbalance of an initial ``hard-core" di-jet selection with ... -
Laura Brittany Havener (Columbia University (US))Poster
Jet imbalance is a known signature of jet energy loss in the hot, dense medium produced in heavy ion collisions. New measurements of the dijet asymmetry at ATLAS are presented using the 2011 Pb+Pb data from the LHC at $\sqrt{s_{NN}}=2.76\mbox{TeV}$ using jets reconstructed with the anti-k_t algorithm with parameters R=0.3 and 0.4. While previous measurements demonstrated a significant effect...
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Anand Kumar Dubey (Variable Energy Cyclotron Centre, Kolkata (IN))Poster
The Compressed Baryonic Matter (CBM) experiment at FAIR is designed to explore the QCD phase diagram in the region of large baryochemical potentials. One of the important experimental observables are dileptons, which probe the properties of the matter in the fireball from the first stage of the collision until freezeout. Dileptons will be produced over a wide range of invariant mass region...
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Eliane Epple (Yale University)Poster
Jet modification by the hot and dense medium created in heavy-ion collisions has been demonstrated by a variety of observables.
A modification like the softening and broadening of the jet fragmentation can be probed optimally with direct $\gamma$-hadron correlations.
The direct photon, produced in hard scatterings back-to-back with a parton, serves as a calibration
of the away side jet and... -
Mr Hendrik Poppenborg (Westfaelische Wilhelms-Universitaet Muenster (DE))Poster
Direct Photon Simulations with POWHEG BOX
Direct photons provide particular insight into nuclear collisions. Since they give immediate access to the energy scale of a hard scattering, direct photons allow further constraints of (nuclear) parton distribution functions, especially on the poorly known distribution of initial state gluons. Direct photons have, moreover, the potential to yield...
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Timothy Rinn (Iowa State University)Poster
Heavy quarks, such as bottom and charm, are primarily produced during
the initial collision. In heavy ion collisions they experience the full
evolution of the hot medium formed. As such they are valuable probes of
the properties of the quark gluon plasma (QGP). The PHENIX Collaboration
has previously published results in Au+Au collisions at $\sqrt{s}$ =200
GeV using the PHENIX silicon vertex... -
Frederique GrassiPoster
The vn distributions measured by ATLAS and ALICE may be used to rule out initial condition models. So far few models (IP-Glasma and EKRT) have been able to pass this test. An interesting question is whether the size of the fluctuations plays a part. In a recent paper [J.Noronha-Hostler, J.Noronha, M.Gyulassy Phys. Rev. C 93, 024909 (2016) ], it was shown that event-averaged quantities such as...
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Miki Sakaida (Osaka University)Poster
We study the time evolution of conserved-charge fluctuations near the QCD critical point and show how the existence of the critical point is observed in experimental measurements of fluctuation observables in heavy ion collisions.
The soft mode of the QCD critical point should obey a diffusion equation because it is a linear combination of the chiral condensate and conserved densities,...
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Dr Roland Katz (University of São Paulo)Poster
The suppression of the quarkonium states in AA collisions, observed by the STAR and PHENIX collaborations at RHIC and by the CMS and ALICE collaborations at LHC, is one of the most convincing evidence for the creation of the Quark Gluon Plasma (QGP). The precise survival of excited states vs ground states could even allow to measure the highest temperature reached in those collisions,...
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Dr Jan Steinheimer (FIAS, Frankfurt)Poster
I will discuss the dynamics of the hadronic phase in ultrarelativistic nuclear collisions in the context of the UrQMD transport model.
I will present results on the hadronic phase effects on final state observables like hadron multiplicity and collective flow. These results show that especially hadron resonance properties and multiplicities, which are very sensitive probes of the hadronic...
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Dr Shu-yi Wei (CCNU)Poster
The effect of the transverse momentum broadening to the total jet energy loss within a given jet cone-size, and therefore to the nuclear suppression factor are studied. The radiated gluons induced by the medium are mostly collinear with the mother parton. Therefore, the energy carried by the radiated gluons outside of the jet-cone is very small. However, the $p_T$ broadening effect can enlarge...
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Dr Sabita Das (Central China Normal University, Wuhan-430079, China)Poster
Hadron yields obtained from elementary collisions up to heavy-ions
have been successfully described by
thermal models with a few parameters such as temperature and baryon
chemical potential [1, 2].
However, the LHC$/$ALICE experiment has recently found that the proton
and antiproton yields are a factor of 2 too low compared to thermal
description [3]. This has been shown to arise... -
Mr ARPAN DAS (Institute of Physics, Bhubaneswar, India)Poster
Very strong magnetic fields can arise in non-central heavy-ion collisions at ultrarelativistic energies, which may not decay quickly due to induced currents in the conducting plasma. Presence of very strong magnetic fields in the plasma (of order $10^{15}$ Tesla) during early stages in RHICE has been explored extensively recently primarily in connection with the so called chiral magnetic...
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Mr Mayank Singh (McGill University)Poster
Geometric and quantum fluctuations in the initial state of heavy-ion collisions leave fingerprints in the measured multi-particle correlation functions. Thermal fluctuations during the quark-gluon plasma (QGP) evolution are another source of dynamical fluctuation. They are conceptually important and can play a crucial role in second-order viscous hydrodynamic simulations [1].
In this work, we...
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Pasi Huovinen (University of Wroclaw)Poster
We study the influence of the finite width of rho meson on the pion momentum distributions and anisotropies. We evaluate the rho-meson properties in the S-matrix framework, and implement them in the hydrodynamical description of the expansion dynamics.
We show that the proper treatment of rho mesons modifies the spectrum of daughter particles, and thus the final observable distributions [1]....
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Moritz Greif (University of Frankfurt)Poster
Transport coefficients of hot hadron and QGP matter characterize their behavior upon external perturbations. Although this can be interesting by itself, they are important input for many phenomenological models that explain data for heavy-ion collisions. In this talk, we present our recent results from kinetic theory for the electric conductivity in a hot hadron gas (see Phys.Rev.D 93...
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Arkadiy Taranenko (National Research Nuclear University MEPhI (RU))Poster
A central goal of heavy ion experiments at the RHIC and LHC Collider is to characterize the properties of the strongly couple Quark Gluon Plasma (sQGP) and the QCD phase diagram. Harmonic Flow measurements of identified particles play an essential role for such studies since they can give insight on the transport coefficients of the sQGP. In this poster we report on the measurements of...
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Subikash Choudhury (Department of Atomic Energy (IN))Poster
The particle species dependence of elliptic flow ($v_{2}$ ) at intermediate
transverse momentum ($p_{T}$ ) provide a mean to investigate the hadronization mechanism
of the dense medium formed in heavy ion collisions. At intermediate
$p_{T}$ (> 2 GeV/c), $v_{2}$ of different particles exhibit an interesting scaling behaviour when
divided by their constituent number of quarks (NCQ-scaling). At... -
maximilian attems (University of Barcelona)Poster
Understanding the properties of extreme phases of nuclear matter created in relativistic heavy ion collisions is one of the major challenges in theoretical physics. A question that is central to the understanding of the very early stages of such collisions near the cross-over temperature of QCD is: How do non-conformal properties affect the resulting plasma? In this presentation we address...
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Mr Ryo Aoyama (University of Tsukuba)Poster
In heavy-ion collisions, strong interactions occur between hard scattered partons and the Quark Gluon Plasma.
Dihadron azimuthal correlations with high $p_T$ trigger particles are a valuable tool to study the interactions between jets and the medium.
Previously, it was shown that dihadron azimuthal correlations are expected to depend on the azimuthal angle of trigger particle relative to the... -
Irais Bautista Guzman (Autonomous University of Puebla (MX))Poster
Event-by-event fluctuations contain information on the dynamics and correlations in pp and heavy-ion collisions. In nuclear collisions event-by-event fluctuations of the mean transverse momentum ($p_{\rm T}$) are used to study collective phenomena. To contribute to the understanding of the collective effects in pp collisions which have been recently shown by experiments at the LHC, and to...
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Anjali Attri (Panjab University)Poster
Theoretical studies predict that some metastable states leading to the local parity violation may be created in relativistic heavy-ion collisions [1]. The interaction of the strong magnetic field produced in the non-central heavy-ion collisions and the deconfined state created in these collisions causes the separation of charges along the axis of the magnetic field. This phenomenon of the...
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Maowu Nie (Shanghai Institute of Applied Physics (SINAP))Poster
Event-by-event measurement of anisotropic flow is crucial to understand the initial state conditions and particle production in heavy-ion collisions. Uranium nuclei provide a unique opportunity to study this, owing to its intrinsic prolate shape and the presence of different overlap configurations in the central collisions like body-body and tip-tip. We present the measurement of the...
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Ms Sonia Parmar (Panjab University (IN))Poster
Kharzeev et al. [1] proposed strong P and CP violation in the hot dense matter created in non-central heavy-ion collisions. The strong magnetic field (B $\sim 10^{15}$ T) induces a separation of electric charge along the direction of the magnetic field resulting in the Chiral Magnetic Effect (CME). This effect has been experimentally observed by the ALICE experiment for Pb-Pb collisions at...
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Wangmei Zha (USTC/BNL)Poster
Suppression of $J/\psi$ production in heavy-ion collisions due to color screening of quark and antiquark potential in the deconfined medium has been proposed as a signature of the QGP formation. Other mechanisms, such as the cold nuclear matter effects and charm quark recombination, can contribute to the observed modification of $J/\psi$ production in heavy-ion collisions. Recently, a...
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jiaxing zhaoPoster
We study doubly charmed baryons at finite temperature. By solving the three-quark Schroedinger equation with lattice simulated quark potential and chiral symmetry restoration at finite temperature, the doubly charmed baryons created in quark-gluon plasma are in the quark-diquark state as a consequence of chiral symmetry restoration. When the diquark state disappears at dissociation temperature...
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Tetsuo Hatsuda (Unknown), Tetsuo Hatsuda (RIKEN)Oral
added for proceedings
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Sungtae Cho (Kangwon National University)Poster
High energy heavy ion collisions are found to be excellent factories for producing heavy hadrons and composite particles including light (anti)nuclei. With upgraded detectors, we are now able to measure hadrons beyond ground states. Thus, heavy ion collisions provide new ways of studying exotic hadrons, which are the primary interests in hadron physics, as many experiments other than heavy ion...
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Kazuya Aoki (KEK)Poster
Hadrons are elementary excitations of the QCD vacuum
thus they reflect the property of the vacuum.
Indeed it is the chiral symmetry breaking of the QCD vacuum that leads to the generation of hadron mass.
The vacuum properties could change according the the enviroment, namely the temperature and the density
but are not well explorered.
For the understanding of QCD and its structure,
it is... -
Salvatore Aiola (Yale University (US))Poster
Jets are a fundamental feature of high-energy particle interactions.
They result from the fragmentation of hard-scattered partons,
a key process of Quantum Chromodynamics (QCD).
The study of the charm content of jets is interesting because up to now
it has eluded a precise quantitative understanding in the framework of perturbative
QCD (pQCD). This is in contrast with other hard processes... -
Francesca Bellini (Universita e INFN, Bologna (IT))Poster
In heavy-ion collisions, measurements of short-lived hadronic resonances can constrain properties of the late hadronic phase, including its lifetime. Along with stable hadrons, resonances are also used to study the flavor dependence of parton energy loss at high transverse momentum and anomalous baryon-to-meson ratios at intermediate momentum. The ALICE detector, which provides excellent...
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Shoichiro Tsutsui (Kyoto University)Poster
In relativistic heavy-ion collisions,
the initial state of the matter formed after the collision can be overpopulated due to the gluon saturation.
Recent simulations based on the kinetic theory or the classical statistical approach suggest that the Bose-Einstein condensate is created at a transient stage of the dynamics.
While these results make sense for weakly interacting systems,
the gauge... -
Daniel Brown (Lehigh University)Poster
A forward calorimeter utilizing hadronic and electromagnetic calorimetry at the STAR experiment of RHIC will achieve a variety of physics goals. These goals include studying long-range rapidity correlations, event plane correlations in heavy-ion interactions, and studying the gluon contribution to the proton spin by measuring forward di-jets and forward-mid rapidity jet correlations in...
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Hongkai Wang (Nikhef National institute for subatomic physics (NL))Poster
It is widely expected that the growth of parton densities at low x predicted from linear QCD evolution cannot continue indefinitely, and that non-linear effects will lead to gluon saturation. We propose the measurement of forward(3.5 < y < 5) direct photons in a new region of low x(∼ 10 −6 ) in proton-nucleus collisions at the LHC as a decisive probe of gluon saturation. In order to...
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Dr Carlos Eugenio Perez Lara (Stony Brook University), Dr Carlos Eugenio Perez Lara (Stony Brook University), Carlos Perez (NIKHEF), Carlos Perez Lara (Universita & INFN, Torino-Unknown-Unknown)Poster
A strong suppression of hadron yields in d+Au collision has been seen at forward rapidities at RHIC, which would be a sign for the onset of gluon saturation in the heavy Au nucleus.
Direct photons provide complementary insight towards the physical nature of the suppression of hadron yields since they are directly sensitive to the gluon density at forward rapidities (through gluon Compton... -
Igor Altsybeev (St Petersburg State University (RU))Poster
Forward-backward (FB) correlations are usually measured between observables obtained in an event-by-event analysis in two separated pseudorapidity intervals.
The conventional observable for the FB correlations analysis is the charged particle multiplicity.
In the present study, instead of the multiplicity, we took an intensive observable, namely the event-averaged transverse momentum of... -
Mr Hiroshi Nakagomi (Tsukuba University), Hiroshi Nakagomi (Tsukuba University)Poster
Azimuthal anisotropies of particle production in high energy heavy ion collisions have proven to be an excellent tool for investigating the initial geometry and the bulk properties of the Quark Gluon Plasma (QGP). Azimuthal anisotropy, measured through Fourier coefficients v_n, have been measured at mid-rapidity and are used to constrain the initial geometry and viscosity-over-entropy ratio...
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Takao Sakaguchi (BNL)Poster
The sPHENIX is the upgrade project of the PHENIX detector whose operation has just ended. This upgrade project mainly focuses on the detailed measurement of the jets and Upsilons.
We have proposed to build a time projection chamber (TPC) as the main tracker for the sPHENIX, which has a radial coverage of 20 cm to 78cm with rapidity coverage of $|\eta|<1.1$ and full azimuth. The number of... -
Maxim Konyushikhin (Wayne State University (US))Poster
The system created in non-central nucleus-nucleus collisions possesses
large orbital angular momentum. Due to this, particles produced in such
a system can become globally polarized along the direction of the
system's angular momentum. We present global polarization measurements
for $\Lambda$ and $\bar\Lambda$ hyperons in Pb-Pb collisions at
$\sqrt{s_{\rm NN}}=2.76$ GeV performed with the... -
Dr Kai Zhou (FIAS, Goethe-University Frankfurt am Main)Poster
We study the equilbriation for gluons far from thermal equilibrium in relativistic kinetic theory with Color Glass Condensate (CGC) inspired initial distribution. Using a partonic cascade approach BAMPS with newly developed stochastic scheme for implementing the quantum statistics, we now simulate here a static gluonic matter with elastic collisions. We show that under such a elastic...
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Alba Soto Ontoso (UGR/FIAS)Poster
In this talk, based on arXiv:1605.09176, we present a microscopic realization of the hollowness effect observed in proton-proton scattering at $\sqrt s = 7$ TeV. The initial collision geometry proposed in our model could impact significantly the interpretation of data specially sensitive to it, like the eccentricities of proton-proton, proton-nucleus and nucleus-nucleus collisions.
The... -
Kirill Lapidus (Yale University (US))Poster
Collisions of ultrarelativistic heavy ions provide an opportunity to investigate strongly interacting matter under extreme energy densities and temperatures. Interaction of hard scattered partons with the hot and dense medium leads to a suppression of the observed jet yields, known as jet quenching. Along with other experimental approaches, studies of the jet substructure have the prospects of...
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Kazuhiro Watanabe (ODU/JLab)Poster
Heavy quark production in proton-nucleus (p$A$) collisions at RHIC and LHC provides important information on the gluon saturation dynamics at small-$x$ of a heavy nucleus. We report the update of our Color-Glass-Condensate (CGC) calculation of heavy flavor production including quarkoniums, open heavy flavor mesons and decay leptons. Moreover, we will implement more realistic treatment for the...
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Lata Thakur (Physical Research Laboratory, Ahmedabad)Poster
We study the behavior of the real and the imaginary parts of the static
potential between a heavy quark and its anti-quark,
which are in relative motion with respect to the QGP medium. The heavy
quark-antiquark complex potential is obtained by correcting both the
Coulombic and the linear terms in the Cornell potential
through the dielectric function in real-time formalism using the hard... -
Andre Mischke (Utrecht University (NL))Poster
Both open and hidden heavy-flavor physics in nuclear collisions is entering a new and exciting stage towards reaching a clearer understanding of the new experimental results with the possibility to link them directly to the advancement in lattice QCD.
Recent results from experiments and theoretical developments regarding open and hidden heavy-flavor dynamics have been debated at the Lorentz... -
Deepa Thomas (University of Texas (US))Poster
Heavy quarks (charm and beauty) are unique probes used to understand the properties of the QCD medium produced in ultra-relativistic heavy-ion collisions. Due to their large masses, they are created in the early stages of the collisions and experience the full evolution of Quark-Gluon Plasma (QGP). They interact with its consitutents and lose energy as they travel through the medium. Heavy...
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Samuel Steed Boren (The University of Kansas (US))Poster
Both the energy and momentum transfer dependence of vector meson photoproduction off the proton are promising signatures of gluon saturation. In this talk, the momentum dependence of exclusive vector mesons such as $\rho^{0}$ and $\Upsilon$ photoproduction will be presented. The $\rho^{0}$ cross section measurement will be presented for $t$ values above 0.5 GeV for the first time, which was...
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Mr Ayon Mukherjee (Frankfurt Institute for Advanced Studies)Poster
We use an improved version of the $SU(3)$ flavour parity doublet quark-hadron model to investigate the baryon number susceptibilities near the de-confinement and nuclear liquid-gas transition. The parity doublet model has been improved by adding the six-point interaction of the $\sigma$ (and $\zeta$) meson in the effective mean field Lagrangian, resulting in a good description of nuclear...
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Dr Gergely Gabor Barnafoldi (Wigner RCP Hungarian Academy of Sciences (HU))Poster
Results with the new HIJING++ will be presented here for hadron production in high-energy heavy ion collisions. The recently developed HIJING++ version based on the latest version of PYTHIA8 and contains all the nuclear effects has been included in the HIJING2.1. We also included an improved version of the shadowing parametrization and jet quenching. Here we summarize the mayor changes of the...
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Di-Lun Yang (RIKEN)Poster
Thermal-photon production from the quark gluon plasma (QGP) phase plays an imperative role for direct photon production in heavy ion collisions. In most of theoretical approaches, the emission rate from the perturbative calculation with hard thermal loop resummation is applied. In order to facilitate our understandings for the impact from coupling dependence on the photons from QGP phase, we...
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Boris Tomasik (Univerzita Mateja Bela (SK))Poster
Events that started with very similar initial conditions should also evolve similarly and produce similar single-particle distributions of hadrons. This is natural consequence of hydrodynamic description of a collision. We present a novel method for data analysis. It compares the histograms of azimuthal hadron distributions from each event and organizes the events in such a way that those with...
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Christopher PlumbergPoster
The field of high-energy nuclear collisions has witnessed a surge of
interest in recent years in the role played by hydrodynamic fluctuations.
Hydrodynamic fluctuations may have significant effects on systems created
at RHIC, FAIR or NICA whose trajectories in the QCD phase diagram pass
near a possible critical end point (CEP). To test for the existence of
such a CEP, it is vital to... -
Chandrodoy Chattopadhyay (Tata Institute of Fundamental Research)Poster
Hydrodynamic or local thermal fluctuations are an important source of event-by-event fluctuations in relativistic heavy-ion collisions. It is a challenge to identify and investigate their effects on experimental observables. Application of the theory of hydrodynamic fluctuations to the boost-invariant (Bjorken) flow has shown that
long-range (rapidity) two-particle correlations are induced by... -
Ryan Weller (University of Colorado at Boulder)Poster
In order to test the applicability of hydrodynamics to small systems, we simulate p+p collisions at $\sqrt{s}=7\text{ TeV}$ and p+Pb collisions at $\sqrt{s}=5.02\text{ TeV}$ using the superSONIC package, which consists of AdS/CFT pre-equilibrium flow, 2+1-dimensional viscous hydrodynamics, and a hadron cascade stage. The initial conditions for hydrodynamics are generated using a Glauber-type...
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Dr Cesar Luiz da Silva (Los Alamos National Lab)Poster
The flavor dependence of jet quenching in the QGP is an important tool to study radiative and collisional energy loss in the medium using probes of different mass scales. B-tagged jet nuclear modification measured at LHC has not shown a parton flavor dependence at high $p_T$, where the quark mass is much smaller than the $p_T$ scale. The proposed sPHENIX experiment at RHIC will measure...
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Tyler Gorda (University of Helsinki)Poster
I will discuss recent progress in the determination of the quark matter equation of state (EoS) and its applications to the phenomenology of neutron stars (NSs). The current state-of-the-art matched QCD EoS comes from the work of Kurkela el al. (2014), in which the authors matched chiral effective theory (cEFT) at low densities to pQCD at high densities. Since then, the $T=0$,...
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Xiaojian Du (Texas A&M University)Poster
We study bottomonium production at RHIC and the LHC using a transport model including both suppression and regeneration mechanisms. The transport model utilizes a kinetic rate equation [1] to calculate the centrality dependence of the production yields, and a Boltzmann equation for transverse-momentum ($p_T$) spectra. It has been successful in describing and predicting charmonium data at SPS,...
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Jeongsu Bok (New Mexico State University)Poster
PHENIX has studied the production of muons from the semi-leptonic decay
of heavy-flavor mesons in the forward rapidity region 1.2<|eta|<2.2. The
measurement of heavy quark production in p+p collisions is important as
a baseline for studying hot and cold matter effects in heavy-ion
collisions, and is a test of pQCD theory. In p+Au collisions, we can
study cold-nuclear-matter (CNM) effects on... -
Tapan Nayak (Department of Atomic Energy (IN))Poster
Nuclear modification factors ($R_{AA}$ or $R_{CP}$) of charged hadrons and
identified particles for heavy-ion
collisions at RHIC and LHC have been used to quantitatively study
the interplay of the partonic collectivity and hadronic
suppression. The outward pressure of strongly interacting partonic
medium in the early stage of the collision creates radial boost, which
is the key factor for... -
Chunjian Zhang (Shanghai Institute of Applied Physics)Poster
The modified number of constituent quark (NCQ) scaling
$v_{n}/n_{q}^{n/2} \sim KE_{T}/n_{q}$ for mesons and baryons and the
scaling relation $v_{n} \sim v_{2}^{n/2}$ for higher-order
anisotropic flows, which were observed experimentally, have been
investigated at the top energy of Relativistic Heavy-Ion Collider. It has been found that the modified
NCQ scaling can not be obtained from the... -
Tyler Danley (Ohio University)Poster
Direct photon—jet pairs are produced in the initial hard scattering of an ion collision and the photon is not affected by the quark-gluon plasma, while the jet loses energy. Therefore, photon-jet pairs are good systems for studying jet energy loss event-by-event. Obtaining direct photons is challenging because of the myriad of background photons and typically a statistical subtraction method...
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Mr Benjamin Audurier (Subatech Laboratory, Nantes, France)Poster
The production of charmonium states (for instance J/$\psi$ and $\psi(2S)$) is one of the probes studied to investigate the properties of the Quark-Gluon Plasma (QGP) formed in high-energy heavy-ion collisions. Indeed, the presence of a deconfined medium should modify the charmonium production yield, due to a competition of the color screening of the charm quark anti-quark potential and the...
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Zhuo Zhou (University of Bergen (NO))Poster
A large excess in the yield of J/ψ at very low transverse momentum compared to the expectations from the nuclear overlap region was recently reported by ALICE in peripheral Pb-Pb collisions at √sNN=2.76 TeV. The observation, made at forward rapidity (2.5<y<4.0) for pT<300 MeV/c using the muon spectrometer, is suggestive of coherent J/ψ photo-production, similar to the measurements done in...
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Dr Sangwook Ryu (Frankfurt Institute for Advanced Studies)Poster
In this work, we explore the interplay between soft (low-$p_T$) and hard (high-$p_T$) particles
in the hadronic phase
of Pb+Pb collisions with $\sqrt{s_{NN}} = 5.02\,\textrm{TeV}$
and $\sqrt{s_{NN}} = 2.76\,\textrm{TeV}$ at the LHC.
The partonic jet energy loss is handled by MARTINI in our simulations,
given that the bulk dynamics of the QCD medium is calculated
with the IP-Glasma... -
Chanwook Park (McGill University)Poster
In the LHC and RHIC experiments, strong collective behavior has been observed in high multiplicity events in the p-p and p-A collisions.
Such behavior strongly suggests that quark-gluon plasma (QGP) is being created even in small systems when enough entropy is produced.
In this work, we utilize an improved version of MARTINI to calculate the effect of the QGP droplet on the jet energy loss in... -
Akshat Puri (Univ. Illinois at Urbana-Champaign (US))Poster
ATLAS uses a jet reconstruction algorithm in heavy ion collisions that takes as input calorimeter towers of size 0.1x0.1 in $\Delta\eta$ x $\Delta\phi$ and iteratively determines the underlying event background. This algorithm, which is different from the standard jet reconstruction used in ATLAS, is also used in the proton-proton collisions used as reference data for the Pb+Pb and p+Pb. ...
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Rosi Jan Reed (Lehigh University)Poster
The sPHENIX proposal is for a second generation experiment at RHIC,
which will take advantage of the increased luminosity due to
accelerator upgrades, and allow measurements of jets and jet
correlations with a kinematic reach that will overlap with
measurements made at the Large Hadron Collider (LHC). Particle jets,
formed when a hard scatter parton fragments and then hadronizes into a
spray... -
Raymond Ehlers (Yale University (US))Poster
Jet energy loss in the Quark Gluon Plasma (QGP) is an active area of research, with many different measurement techniques attempting to determine its properties. One technique is to measure the azimuthal correlations of a trigger jet and the associated hadrons in the event. These measurements, known as jet-hadron correlations, are expected to be sensitive to broadening and softening of an...
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Jindřich Lidrych (Czech Technical University in Prague)Poster
Femtoscopy allows us to measure the space-time characteristics of the system
at the moment of particle emission using two-particle correlations. In comparison to the most abundant pions, kaons provide a cleaner probe as they are less affected by resonance decays. Since kaons contain strange
quarks and have smaller cross section with hadronic matter than pions, they
may be sensitive to... -
Jesse Thomas Buxton (Ohio State University (US))Poster
We present results from a femtoscopic analysis of Lambda-Kaon correlations in Pb-Pb collisions at $\sqrt{s_{NN}}$ = 2.76 TeV by the ALICE experiment at the LHC. All pair combinations of $\Lambda$ and $\bar{\Lambda}$ with K$^{+}$, K$^{-}$ and K$^{0}_{S}$ are analyzed. The femtoscopic correlations are the result of strong final-state interactions, and are fit with a parametrization based on a...
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Yuko Sekiguchi (University of Tokyo (JP))Poster
Correlations measurements as a function of the azimuthal angle and rapidity are very useful for investigating particle productions in high-energy nucleus- nucleus collisions.
Long range, near side angular correlations have been observed in high multiplicity $pp$ and $p$-Pb collisions at the LHC energies.
Possible explanations of the long range correlations in high multiplicity $pp$ and $p$-Pb... -
Mr Vladimir Khachatryan (Stony Brook University)Poster
Direct photons, which are produced during all stages of a heavy-ion collision, directly probe the conditions of their production environment. The large yield and large anisotropy of low momentum direct photons observed in 200 GeV Au+Au collisions poses a significant
challenge to theoretical models. Measurements at a lower collision energy may provide
new insight on the origin of the low... -
Ms Wenqing Fan (Stony Brook University)Poster
One of the major goals in heavy ion physics is to study the property of Quark Gluon Plasma (QGP). Direct photons turn out to be golden probes due to their small interaction with the medium. Direct photons are also produced in every known or conjectured stages of the collision hence carrying information of the entire evolution of the system. PHENIX has discovered a large excess of thermal...
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Sebastian Lehner (Austrian Academy of Sciences (AT))Poster
Results from non-perturbative QCD indicate that chiral symmetry may be restored in the hot and dense matter produced in relativistic heavy ion collisions. This restoration would affect the vector meson mass spectrum and could be examined with the ALICE detector at the LHC. One of the most promising probes to study these effects are dileptons ($μ^{+}μ^{-}$ and $e^{+}e^{-}$) from ρ meson decays...
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Manan Shah (PDPIAS, CHARUSAT)Poster
Recently, many singly heavy baryons have been established in experimental facilities like CLEO, Belle, BABAR, LHCb as well as in Lattice QCD. The description of baryons within the constituent quark model is a very important problem in QCD. Various quark models suggest that all baryons are made of three quarks bounded by strong interactions. Our relativistic quark model gives special emphasis...
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Eduard Seifert (University of Giessen)Poster
We study the impact of baryon-antibaryon annihilation into three mesons on heavy-ion collisions. The reactions are based on the quark rearrangement model in the light and strange sector. Box simulations with periodic boundary conditions confirm that our implementation of these reactions fulfills the detailed balance relation on a channel by channel basis. We implement these reactions into the...
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Shuai Liu (Texas A&M University)Poster
Current experimental findings at RHIC and LHC imply that a strongly coupled quark gluon plasma (QGP) is created in heavy-ion collisions. This calls for a non-perturbative investigation to understand relations between various observables and the underlying physical mechanisms. Considering the difficulties in first principle approaches, we have developed a tractable non-perturbative many-body...
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Alena Harlenderová (STAR)Poster
The existence of Quark-Gluon Plasma (QGP) is predicted by lattice QCD at high
temperatures or large nuclear densities.
Various probes were proposed to study this phase of matter, among which $J/\psi$ suppression due to color screening of the quark potential in the QGP is of special interest
since this mechanism implies the formation of the defined matter.
However, contribution from the... -
Alexandre Lebedev (Iowa State University)Poster
While the study of charmonium production provides a unique opportunity to access basic QCD dynamics, the exact production mechanisms are not yet fully understood. Many different models can adequately describe the cross-section and transverse momentum ($p_T$) distribution of charmonium produced in proton-proton collisions, but predict different polarization. Thus, charmonium polarization...
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Priyanka Sett (IIT- Indian Institute of Technology (IN))Poster
The first measurement of the $\Lambda$(1520) baryonic resonance in pp collisions at $\sqrt{s}=13~$TeV, performed using the ALICE detector at the LHC, is presented. The analysis details for invariant mass reconstruction in the hadronic decay channel $\Lambda$(1520) $\rightarrow$ pK$^{-}$ are discussed. The invariant mass distributions for various $p_{\rm T}$ intervals are obtained from 0 <...
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Andrea Rossi (Universita e INFN, Padova (IT))Poster
Produced in hard-scattering processes in the initial stage of the collision, heavy quarks probe the whole evolution of the deconfined system (Quark-Gluon Plasma) formed in ultra-relativistic heavy-ion collisions. The measurement of the azimuthal anisotropy of D-meson production is crucial to understand charm quark in-medium energy loss and its coupling to the system. ALICE measured a positive...
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Jing Chen (University of Science and Technology of China (CN))Poster
The production of Upsilon in p+Pb collisions is a key ingredient for understanding ‘cold’ nuclear effects, relevant both for nuclear PDF studies as well as ‘hot’ nuclear matter studies. The ATLAS experiment has measures the Upsilon in its ground and excited states via the dimuon decay channel using 28 nb-1 of p+Pb data at the center-of-mass energy of 5.02 TeV, and 25 pb-1 of pp data. The...
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Ivan Vorobyev (Technische Universitaet Muenchen (DE))Poster
Low-mass dielectrons are a unique experimental tool to investigate the hot and dense medium created in ultra-relativistic heavy-ion collisions. Since they are created during all stages of the collision and do not interact strongly, they carry information about the medium properties unperturbed by strong final-state effects allowing us to probe the whole space-time evolution of the...
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Meike Charlotte Danisch (Ruprecht-Karls-Universitaet Heidelberg (DE))Poster
Neutral mesons can provide important information on the energy loss of partons traversing the hot and dense state of matter, which is created in high energy heavy-ion collisions.
Furthermore, they constitute the largest background contribution for direct photons, which are also a very important tool to study the properties of the Quark Gluon Plasma.
In the ALICE experiment, neutral mesons can... -
Daiki Sekihata (Hiroshima University (JP))Poster
Neutral mesons such as $\pi^{0}$ and $\eta$ that decay into two photons are suitable to study parton energy loss in the QGP, since they can be identified, using a fine-segmented electromagnetic calorimeter, in a wide transverse momentum range.
The Photon Spectrometer (PHOS) in ALICE is an electromagnetic calorimeter which is located at 4.6 m from the interaction point.
PHOS consists of 12,544... -
Adam Tomasz Matyja (Polish Academy of Sciences (PL))
Neutral meson production in pp collisions is described by pQCD in a limited kinematic range. Both $\pi^0$ and $\eta$ meson spectra
constrain parameters of theoretical models in both perturbative (NLO, NNLO) and non-perturbative regimes (structure function, fragmentation function). Neutral meson spectra in pp are used as a reference for Pb-Pb and p-Pb measurements at the same per nucleon... -
Daniel Michael Muhlheim (Westfaelische Wilhelms-Universitaet Muenster (DE))Poster
ALICE has measured the invariant cross sections for the production of neutral pion and eta mesons in proton-proton collisions at $\sqrt{s}$ = 8 TeV.
Neutral mesons have been reconstructed by means of three different detection systems; using the central barrel tracking detectors of ALICE in order to reconstruct photon conversions (PCM) and the two available calorimeters in the experiment,... -
Hikari Murakami (University of Tokyo (JP))Poster
Measurement of neutral mesons, such as $¥pi^{0}$ and $¥eta$ plays an important role to study parton energy loss in the Quark-Gluon Plasma created in high-energy heavy-ion collisions. Such measurement in pp collisions at $¥sqrt{s}$ = 5.02 TeV provides a good reference for understanding the mechanisms appearing in p-Pb and Pb-Pb collisions at the same collision energy.
In ALICE, we measure... -
Sebastian Tapia Araya (Federico Santa Maria Technical University (CL))Poster
The in-medium suppression of J/ψ production in heavy-ion collisions, with respect to pp collisions, serves as a sensitive probe for studying the quark gluon plasma. A full assessment of the suppression requires understanding effects present in the hot and dense medium in the Pb+Pb collisions as well as cold nuclear effects in the small p+Pb collision. Based on Pb+Pb collision data collected in...
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Fabrizio Grosa (Politecnico e INFN Torino (IT))Poster
Open heavy-flavor mesons (particles made of a heavy quark, i.e. charm or beauty, and a light quark) are a unique tool to study and characterize the properties of the Quark-Gluon Plasma (QGP). Heavy quarks are produced in the initial stages of the collisions, and they experience the whole system evolution, interacting with the medium constituents. Since charm and beauty quarks have different...
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Javier Orjuela Koop (University of Colorado Boulder)Poster
Heavy charm and bottom quarks are excellent probes to study the mechanisms by which colored objects lose energy in the QGP. In particular, given their different masses, the differential suppression of charm and bottom can provide important constraints on models describing energy loss mechanisms. The PHENIX experiment has previously used the micro-vertexing capabilities of its silicon vertex...
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Pascal Dillenseger (Johann-Wolfgang-Goethe Univ. (DE))Poster
J/$\psi$ measurements at $\sqrt{s_{\rm NN}}$ = 2.76 TeV Pb$-$Pb collisions clearly show a smaller suppression than the one expected from color screening, when compared to binary-scaled pp collisions. An answer to this behavior is presented by models containing a regeneration component. In these models a possible (re)combination of (un)correlated c$\overline{\rm{c}}$-quarks enhances the...
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Peng Huo (State University of New York (US))Poster
Longitudinal dynamics has recently become a topic of great interest in the study of ultra-relativistic heavy ion collisions. Measurement of the longitudinal fluctuations of the flow harmonic coefficients $v_n$ and event-plane angles $Psi_n$ can provide a more complete picture of space-time evolution of the hot, dense medium formed in heavy ion collisions. Longitudinal flow decorrelations can...
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Shingo Sakai (University of Tsukuba (JP))Poster
Heavy quarks (charm and beauty) are produced primarily in the initial hard partonic interactions in heavy-ion collisions.
Since they propagate through and interact with the hot and dense QCD matter,
measurements of the heavy-flavour production provide relevant information on the early stage of the collisions and parton-medium interaction.
A strong suppression of heavy-flavour hadron production... -
Dr Iouri Vassiliev (GSI)Poster
The main goal of the CBM experiment at FAIR is to study the behavior of nuclear matter at very high baryonic density in which the transition to a deconfined and chirally restored phase is expected to happen. The promising signatures of this new state are the enhanced production of multi-strange particles, production of hypernuclei and dibaryons. Theoretical models predict that single and...
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Mr Toshihiro Nonaka (University of Tsukuba)Poster
Cumulants of conserved quantities is one of the powerful tools to study the QCD phase structure.
According to the Lattice Gauge Theory calculation, at small $\mu_{B}$ a "smooth cross-over" for the transition from QGP to hadronic system occurs in heavy-ion collisions [1].
Experimentally, however, there is still no evidence for the predicted "smooth cross-over".
One of the possible ways to test... -
Jinjin Pan (Wayne State University (US))Poster
Measuring balance functions of different hadronic species holds the prospect of providing a quantitative insight into the chemical evolution of the Quark Gluon Plasma created in ultra-relativistic heavy ion collisions$[1]$. Balance functions have been measured for identified charged-pion pairs and for identified charged-kaon pairs in Pb-Pb collisions at $\sqrt{s_{NN}}=$ 2.76 TeV by the ALICE...
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Alexander Milov (Weizmann Institute of Science (IL))Poster
Measurements of the nuclear modification factor for charged hadrons is an indirect way to understand the jet energy loss mechanism. Charged hadron spectra were measured in Pb+Pb, p+Pb and pp collisions at sqrt(s), sqrt(s_NN)=5.02 TeV. The higher statistical significance of the Pb+Pb data sample with the total integrated luminosity of 0.49nb^-1, p+Pb sample of 25nb^-1 and pp sample of 25pb^-1...
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Ritsuya Hosokawa (University of Tsukuba (JP))Poster
Jets originate from hard scattered partons at the initial stage of collisions. In heavy ion collisions, jets are sensitive to medium effects on the partons traversing the QGP and probe the properties of the hot and dense strongly interacting matter. Measurements of the jet nuclear modification factor ($R_{AA}$) and its centrality dependence with different choices of the jet resolution...
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Xiaozhi Bai (University of Illinois at Chicago)Poster
Heavy flavor quarks are suggested as excellent probes to study the strongly interacting Quark-Gluon Plasma (QGP) discovered in high-energy heavy-ion collisions. Due to their large masses, charm and bottom quarks are produced dominantly during initial hard partonic scatterings, and thus experience the entire evolution of the QGP. Measurements of heavy flavor production have advanced our...
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Antonio Carlos Oliveira Da Silva (Universidade de Sao Paulo (BR))Poster
Charm quarks are created in the early stages of heavy-ion collisions in hard-scattering processes. Therefore, they are ideal probes of the Quark-Gluon Plasma (QGP). The fragmentation of charm quarks can produce D mesons.
Jets containing a D meson as one of their constituents can be identified as originating from heavy-quark fragmentation. D-tagged jets are a valuable tool to characterize the...
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Shenghui Zhang (USTC)Poster
Heavy quarks are predominantly produced at early stages of high-energy heavy-ion collisions due to their large masses. Studies of interactions between heavy quarks and the Quark-Gluon Plasma (QGP) in different collision systems can provide new insights to the properties of the QGP. Thus measurements of heavy quark production via measuring the electrons from semi-leptonic decays of heavy flavor...
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Siwei LuoPoster
Quarkonium production mechanisms in hadron collisions are not fully understood. Different models on quarkonium production can describe the measured production cross-sections in p+p collisions but have significantly different predictions on quarkonium polarization. Measurements of J/psi polarization in p+p collisions can distinguish these models to test the fundamental theory on quarkonium...
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Alexandre Shabetai (Centre National de la Recherche Scientifique (FR))Poster
Produced in a hard scattering at the early stage of the collision a highly energetic parton is first expected to lose energy in the medium before fragmenting into a hadronic spray of particles called jet. A detailed study of the modification of the jet structure and of its fragmentation pattern in vacuum and in medium should provide insights into the QGP properties.
The jet fragmentation... -
Arghya Chatterjee (Variable Energy Cyclotron Centre, Kolkata)Poster
Study of event-by-event fluctuations of conserved charges, i.e. susceptibilities of conserved charges is a powerful tool to understand and characterize the thermodynamic properties of the hot and dense QCD matter. The ratios of 2nd order off-diagonal to diagonal susceptibilities such as $\chi^{1,1}_{B,S}/\chi^{2}_{S}$, $\chi^{1,1}_{Q,B}/\chi^{2}_{B}$, and $\chi^{1,1}_{Q,S}/\chi^{2}_{S}$, are...
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Mrs Krista Smith (Florida State University)Poster
Upsilons provide an excellent probe for studying the screening length in the Quark Gluon Plasma through simultaneous observation of the Υ(1S), Υ(2S) and Υ(3S), using pp, pA and AA collisions. Unlike the charmonium states, the Υ yield in AA collisions due to coalescence of bottom quarks produced in unrelated hard processes is expected to be small at both RHIC and LHC energies. Comparison of the...
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Dubinin Aleksandr (University of Wroclaw)Poster
We present an effective model for low-energy QCD thermodynamics which provides a
microscopic interpretation of the transition from a gas of hadron resonances to the quark-gluon plasma by Mott dissociation of hadrons and compare results with data from lattice QCD simulations. We consider the thermodynamics of the Polyakov-loop extended
Nambu–Jona-Lasinio (PNJL) model within the self consistent... -
Peifeng Liu (Stony Brook University)Poster
Recently, interest in initial state models have increased due to the observation of a "ridge" in small systems (p+p, p+Au, p+Pb, d+Au, p+Pb, etc.). Initial partonic fluctuations in the participant nucleons which comprise small systems, could be important. As a class of candidates, the consequences of constituent quark Glauber models are explored. Multiplicity density is found to scale with the...
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Mr Andriniaina Rasoanaivo (University of Cape Town)Poster
We present a new approach to compute the probability for emission of an arbitrary number of gluons radiated from a high-pT probe of the QGP. Our work is an extension of the maximal helicity violating (MHV) method in which the usual soft-collinear factor is classified according to its symmetry under gluon permutations.
For the purposes of illustration, we show the explicit form of the result...
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Annika Passfeld (Westfaelische Wilhelms-Universitaet Muenster (DE))Poster
The measurement of particle production in p-Pb collisions at $\sqrt{s_{\rm NN}}=$ 5.02 TeV allows the study of fundamental QCD properties 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 production at... -
Ms Pooja Pareek (Indian Institute of Technology Indore (IN))Poster
Advanced analysis of pp collisions at $\sqrt{s}=7$ TeV collected by the photon spectrometer PHOS of the ALICE experiment
is presented. The 2010 dataset with integrated luminosity $L_{\rm int} = 7,7~\mbox{nb}^{-1}$ has been analysed. Improved energy and timing calibration allow to reconstruct the spectrum of inclusive neutral pions production at midrapidity in the transverse momentum range $0.8... -
Satoshi Yano (Hiroshima University (JP))Poster
Measurement of neutral pion production in $pp$ collisions is useful to test the QCD predictions at high $p_{\rm T}$ (> 4 GeV/$c$). At low $p_{\rm T}$, perturbative QCD cannot be applied to predict the particle production and therefore, only phenomenological models can be used. To put constraints on these models, the measurement in a very wide $p_{\rm T}$ region is very important. Furthermore,...
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Dr Ilkka Helenius (Tübingen University)Poster
High-energy nuclear collisions are often classified in terms of centrality. Theoretically, the centrality binning is determined by Glauber models which take the nuclear density as an input. The nuclear density is traditionally parametrized by the Woods-Saxon form and is taken to be the same for protons and neutrons. However, according to the theoretical expectations and experimental...
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Florian Herrmann (Westfaelische Wilhelms-Universitaet Muenster (DE))Poster
Heavy flavour (beauty and charm) quarks are of special interest for the study of the Quark-Gluon Plasma as they are predominantly produced in the initial hard-scattering processes and participate in the entire evolution of the system created in heavy-ion collisions. Thus, heavy flavours are an excellent probe to study in-medium energy loss (mechanisms) in nuclear collisions by measuring, for...
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Leonardo Tinti (Jan Kochanowski University)Poster
We study the evolution of the one-dimensional, non-boost-invariant evolution of a hot dense system, in similar conditions to the ones found in Quark Gluon Plasma created in heavy-ion experiments. We neglect transverse dynamic, but we relax the assupmption of longitudinal boost invariance and rapidity independence.
We compare the results obtained from several formulations of viscous hydrodynics... -
Xiaolong Chen (USTC/LBNL)Poster
Heavy flavor quarks ($c$, $b$) are produced dominantly by the interactions of the initial incoming partons, and thus experience the entire evolution of the hot and dense medium created in high-energy nuclear collisions. Systematic investigations of charm and bottom hadron production in heavy-ion collisions will shed lights into the understanding of the parton energy loss in the Quark-Gluon...
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Dr Ulrich Heinz (The Ohio State University)Oral
added for email list
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Olga Evdokimov (University of Illinois at Chicago (US))Oral
added for proceedings
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Peter Martin Jacobs (Lawrence Berkeley National Lab. (US))Oral
added for proceedings
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Hamda CHERIF (GSI)Poster
The Compressed Baryonic Matter (CBM) experiment at the future facility FAIR in Darmstadt is a dedicated heavy ion experiment which will operate in fixed target mode at beam energies up to 11A GeV for ions delivered by the SIS100 accelerator.
In order to explore the QCD phase diagram at high net-baryon densities, CBM holds a wide and rich physics program. One of the main experimental... -
Prof. Zi-Wei Lin (Central China Normal University, East Carolina University)Poster
A Multi-Phase Transport (AMPT) model has been shown to describe experimental data well, including the particle spectra and azimuthal anisotropies ($v_n$) of pions and kaons below $p_T$ of ~1.5 GeV/c in heavy ion collisions [1] as well as small system collisions [2]. By following the parton collision history in AMPT, we have found that the opacity in AMPT is relatively small and the parton...
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Mr Lin Chen (Central China Normal University)Poster
Dijet momentum balance in both p+p and Pb+Pb collisions at 2.76 TeV is studied within a multi-phase transport (AMPT) model. We analyze projection \ptslash{} of transverse momentum p_T of all particles onto leading jet axis, and obtain overall momentum balance in dijet events, which qualitatively fits CMS data for p+p and Pb+Pb collisions. Against the contribution to \ptslash{} in leading jet...
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Sean Gavin (Wayne State University)Poster
Is thermalization necessary for hydrodynamic flow in nuclear collisions? The discovery of flow-like azimuthal correlations in pA and high-multiplicity pp collisions raises profound questions about the onset of collective flow and its relation to hydrodynamics. We seek independent experimental information on the degree of thermalization in order to identify those truly hydrodynamic collision...
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Hyeonjoong Kim (Yonsei University (KR))Poster
Heavy nuclei colliding at ultra-relativistic energies at the Large Hadron Collider (LHC) produce a hot and dense state of matter filled with deconfined quarks and gluons. Particles produced by hard-scatterings interact with the hot and dense medium as they propagate through it, in a process known as jet quenching.
The medium-induced modification of the jet-like particle yield can be...
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Dr Masaru Hongo (RIKEN, iTHES research group)Poster
Relativistic hydrodynamics, which successfully describes the quark-gluon plasma created in heavy-ion collisions, is formulated based on the assumption that systems are almost in local thermal equilibrium. However, a quantum field theoretical way to handle such a locally thermalized matter has not been clearly clarified.
In this study, we develop imaginary-time formalism for relativistic...
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Jakub Andrzej Kremer (AGH University of Science and Technology (PL))Poster
The peak rate of interactions in high luminosity heavy ion runs in 2015 and 2016 was well above the ATLAS maximum recording rate of around 1kHz. Therefore an active trigger selection is applied relying partly on algorithms used for selection during pp data taking and a set of algorithms dedicated solely for heavy ions. They are used to collect enhanced samples of high multiplicity,...
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Tomoko Sakamoto (Nara Women's University (JP))Poster
QCD inspired models predict that a saturated gluon state, so called Color Glass Condensate (CGC) is produced in the nucleon and nucleus at very high energy such as at the Large Hadron Collider (LHC). One of the most sensitive and cleanest probes of CGC effect is the
production of isolated photon in the forward region ($3 < \eta < 5$) at intermediate $p_{T}$ (few $GeV/c$).The ALICE-FoCal...
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Erin Frances Gauger (University of Texas (US))Poster
A Large Ion Collider Experiment (ALICE) is a major experiment at the Large Hadron Collider (LHC) at CERN. It is specifically designed to investigate the Quark-Gluon Plasma (QGP), a state of matter in which quarks and gluons are momentarily deconfined. The QGP is short-lived, and must therefore be studied indirectly by identifying the final-state particles produced in heavy-ion collisions. The...
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Dr Wei-Liang Qian (Universidade de Sao Paulo)Poster
The data of di-hadron azimuthal correlations at different centralities for Au+Au collisions at 200 A$\,$GeV were presented by the PHENIX Collaboration.
It was observed that the away-side correlation evolves from double- to single-peak structure when the centrality decreases. In this work, we show, in terms of the peripheral tube model, that the observed features naturally appear due to an... -
Kurt Keys Hill (University of Colorado Boulder (US))Poster
Measurements of the charged particle multiplicity as a function of pseudorapidity help constrain our understanding of collision dynamics and particle production mechanisms. In 2016, RHIC operations included d+Au collisions at 200, 62.4, 39, and 19.6 GeV. This poster presents the current status of analysis of charged particle multiplicities in the 2016 d+Au beam energy scan.
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Milap PatelPoster
The PHENIX Muon Piston Calorimeter Extension (MPC-EX) is a Si-W pre-shower detector positioned at forward rapidity (3.1 < |η| < 3.8) in front of the already existing MPC. It is a combined charged particle tracker and EM preshower detector with the readout signal of each Si minipad (1.8 x 15 mm) split into high and low gain to provide sensitivity from MIPs up to full energy EM showers. The...
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Weizhuang Peng (Vanderbilt University (US))Poster
Recent results from small collision systems at RHIC and LHC indicate that many of the signatures of collective behavior observed in AA collisions are also present in small systems in high-multiplicity events. The PHENIX experiment has performed comprehensive studies of long-range particle correlations and anisotropic flow in p/d/He3+Au collisions. Mass ordering has been observed in the pt...
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Attila Bagoly (Eötvös Loránd University)Poster
Bose-Einstein correlations of identical hadrons reveal information about hadron
creation from the sQGP formed in ultrarelativistic heavy ion collisions. The
measurement of three particle correlations may in particular shed light on
hadron creation mechanisms beyond thermal/chaotic emission. In this poster we
show the status of PHENIX measurements of three pion correlations as a function of... -
Mohammad Nopoush (Kent State University)Poster
We make phenomenological predictions for particle spectra and flow in heavy-ion col- lisions using 3+1d anisotropic hydrodynamics (aHydro) including the effects of both bulk and shear viscosities. The dynamical equations necessary are derived by taking moments of Boltzmann equation allowing for three distinct momentum-space anisotropy parameters. The formulation is based on relaxation-time...
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Murad Sarsour (Georgia State University)Poster
The production of φ mesons provides key information on the hot and dense state of the strongly interacting matter produced in high-energy heavy-ion collisions. They are sensitive to enhanced strangeness production in the medium. Measurements in different nucleus-nucleus collisions allow us to perform a systematic study of the nuclear medium effects on phi meson production. In addition to...
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Jaehyeon DoPoster
The MPC-EX Si-W preshower sits in front of a PbWO4 electromagnetic calorimeter, and consists of eight layers of thin tungsten plates and Si sensors. It covers the forward pseudorapidity range of 3.1 < eta < 3.8 and enabled the study of low-x partons in the gold nucleus through prompt photon production in p+A collisions. Each silicon sensor is divided into mini-pad sensors (2mm x 16mm) to...
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Sumit Basu (Department of Atomic Energy (IN))Poster
Nature of QCD phase transitions in high energy collisions can be pinned down by studying the
behaviour of thermodynamic response functions with respect to $T$ and $\mu_B$.
A first order phase transition is signalled by the divergence of
specific heat ($c_v$), whereas for a second order
or continuous transition, isothermal compressibility
($k_T$) diverges.
$c_v$ is estimated at the kinetic... -
Ms Jingyi Chao (Institute of Modern Physics, CAS)Poster
We investigate the response of the QCD ground state at finite temperatures to an anti-parallel electric and magnetic field. Due to the electromagnetic triangle anomaly, both neutral and charged pion condensations are created in the presence of non-vanishing ($E\cdot B$).
In the frame of the proper-time Schwinger formalism, we addressed the oscillation obstacle because of the electric field...
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Petja Paakkinen (University of Jyväskylä)Poster
Despite the success of modern nuclear parton distribution functions (nPDFs) in describing nuclear hard-process data, they still suffer from large uncertainties. One of the shortcomings is the lack of data which would constrain the nuclear effects of all parton flavours simultaneously without any a priori assumptions. For example, it has been customary to assume that nuclear modifications for...
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Jarkko Peuron (University of Jyväskylä)Poster
Classical Yang-Mills theory calculations are frequently used to study nonequilibrium phenomena in nonperturbative overoccupied systems, especially in the context of ultrarelativistic heavy-ion collisions. We study the limits of the quasiparticle picture of the classical Yang-Mills fields by determining the plasmon mass of the system using 3 different methods. We also demonstrate an algorithm...
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Brandon Krouppa (Kent State University)Poster
We compute the suppression of the bottomonia states $\Upsilon(1S)$, $\Upsilon(2S)$, $\Upsilon(3S)$, $\chi_{b}(1P)$, $\chi_{b}(2P)$, and $\chi_{b}(3P)$ states in LHC $\sqrt{s_{NN}} = 5.023$ TeV Pb-Pb collisions. For the background evolution we use 3+1d anisotropic hydrodynamics with conditions extrapolated from $\sqrt{s_{NN}} = 2.76$ TeV and self-consistently compute bottomonia decay rates...
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Dr Md Nasim (UCLA)Poster
Relativistic heavy-ion collision experiments aim to study the formation and evolution of a strongly interacting matter called Quark Gluon Plasma (QGP). Initial spatial anisotropy and/or quantum fluctuations of the positions of the colliding nucleons lead to development of anisotropic collective expansion of the QGP medium. The magnitude of anisotropic flow harmonics ($v_{n}$) fluctuates from...
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Dr Aihong Tang (Brookhaven National Laboratory)Poster
The electromagnetic field pattern created by spectators in relativistic heavy-ion collisions plants a seed of positive (negative) magnetic helicity in the hemisphere above (below) the reaction plane. Owing to the chiral anomaly, the magnetic helicity interacts with the fermionic helicity of the collision system and causes photons emitted in upper and lower hemispheres to have different...
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Jihye Song (Pusan National University (KR))Poster
The measurement of resonances in ultra-relativistic heavy-ion collisions allows one to study the properties of the hadronic medium. Resonances with short lifetimes compared to the duration of the hadronic phase are good candidates to probe the interplay of particle re-scattering and regeneration in the hadronic phase, which result in a modification of the measured yield of resonances.
... -
454. Prospects for ALICE physics with the Muon Spectrometer Upgrade and the new Muon Forward TrackerDr Antonio Uras (Universite Claude Bernard-Lyon I (FR))Poster
ALICE is the experiment specifically designed for the study of the Quark-Gluon Plasma in heavy-ion collisions at the
CERN LHC. The ALICE detector will be upgraded during the LHC Long Shutdown~2, planned for 2019-2020, in order to fully exploit
the large integrated luminosity that will be provided by the LHC in Run~3 and Run~4.The Muon Forward Tracker (MFT), an internal tracker added in the...
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Kristjan Gulbrandsen (University of Copenhagen (DK))Poster
Anisotropic flow is one of the key observables in heavy-ion collisions and puts constraints on the QGP equation of state. In particular, the pseudorapidity ($\eta$) dependence of anisotropic flow coefficients provides information on the hydrodynamical response of the system in the context of variations in the particle density.
The ALICE detector provides unprecedented angular coverage at the...
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anping huang (Tsinghua Unversity)Poster
Chiral anomaly is a fundamental aspect of the quantum theory for chiral fermions. In a many-body system containing chiral fermions, such as the hot quark-gluon plasma created in heavy ion collisions at RHIC and the LHC, the chiral anomaly leads to macroscopic anomalous transport effects. A notable example is the chiral magnetic effect (CME), in which a vector current is generated along an...
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Hidetoshi TAYA (The University of Tokyo)Poster
We study quark and gluon production from an expanding strong color electric flux tube. Firstly, we derive a set of linear equations for quantum fluctuations by employing a mean-field approximation on top of the strong color electric flux tube, which describes the particle production and its backreaction on the flux tube. Second, we carry out numerical simulations and discuss how the flux...
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Babak Salehi Kasmaei (Kent State University)Poster
We calculate the quark self-energy in a quark-gluon plasma that possesses an ellipsoidal momentum-space anisotropy in the local rest frame. By introducing additional transverse momentum anisotropy parameters into the parton distribution functions, we generalize previous results which were obtained for the case of a spheroidal anisotropy. Our results demonstrate that the presence of...
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Thorsten Steinert (JLU Giessen)Poster
The QCD equation of state as predicted by lattice QCD calculations (lQCD) is well reproduced in terms of effective quasiparticle models. These models so far fail to describe the susceptibilties and underestimate the pressure
at finite densities. We present a generalised quasiparticle model where the partonic propagators explicitly depend on the three-momentum with respect to the medium. Within... -
Chris Ferraioli (University of Maryland (US))Poster
Studies of the production of heavy quarkonium states are crucial to improve our understanding of QCD and hadron formation. Large data samples of S-wave quarkonium states decaying in the dimuon channel have been collected by CMS in pp collisions at 7, 8 and 13 TeV, profiting from a very selective trigger and the record-level energy and luminosity provided by the LHC. This allowed the CMS...
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Sarah Porteboeuf (Univ. Blaise Pascal Clermont-Fe. II (FR))Poster
Quarkonia are mesons formed of either a charm and anti-charm quark pair (J/Psi, Psi(2S)), or a beauty and anti-beauty quark pair (Upsilon(1S), (2S) and (3S)). In high-energy hadronic collisions such as those delivered by the LHC between 2010 and 2015, quarkonium production results from the hard scattering of two gluons in a process which occurs very early in the collision followed by the...
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Mubarak Alqahtani (Kent State University)Poster
We use quasiparticle anisotropic hydrodynamics to study an azimuthally-symmetric boost-invariant quark-gluon plasma including the effects of both shear and bulk viscosities. In quasiparticle anisotropic hydrodynamics, a single finite-temperature quasiparticle mass is introduced and fit to the lattice data in order to implement a realistic equation of state (EoS). We compare results obtained...
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Dr Prakhar Garg (SUNY Stony Brook)Poster
The proposed sPHENIX detector design is focused mainly on a physics program of precise upsilon spectroscopy and jet measurements, leading to a requirement for high tracking efficiency and excellent momentum resolution. A time projection chamber (TPC) is proposed as the outer tracking detector for sPHENIX, which has a rapidity coverage of $|\eta|<1.1$ and full azimuthal coverage. The sPHENIX...
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Michael William Phipps (Univ. Illinois at Urbana-Champaign (US))Poster
Increases in luminosity and collision energy at the LHC challenge the radiation hardness of detectors located along the beamline. This problem is especially acute for the ATLAS Zero Degree Calorimeters (ZDCs), which are exposed to about 10^10 rad/yr, rendering the current version of the detector unusable during p+p running. To address this shortcoming and allow for important triggers and...
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Dr Kaushal ThakkarPoster
In hadron spectroscopy, various decay processes of the heavy flavour baryons are important to identify the new hadronic states observed experimentally. The strong decays are expected to dominate the branching ratios of heavy flavour baryons. Although the electromagnetic strength is weaker than that of the strong interaction, radiative channels are not phase space suppressed as in the case of...
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Prof. George Moschelli (Lawrence Technological University)Poster
The forces that drive the nuclear collision system towards local thermal equilibrium leave few observable traces. We show that measurements of the rapidity dependence of transverse momentum correlations can be used to determine the characteristic time $\tau_\pi$ that dictates the rate of isotropization of the stress energy tensor, as well as the shear viscosity $\nu=\eta/sT$. We formulate...
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Stefano Trogolo (Universita e INFN Torino (IT))Poster
The high collision energies reached at the LHC enable significant production rates of light (anti-)nuclei in proton-proton (pp), proton-lead (p-Pb) and in lead-lead (Pb-Pb) collisions.
The excellent particle identification capabilities of the ALICE detector, based on the specific energy loss in the time projection chamber and the velocity information from the time-of-flight detector, are...
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Mr Derek Anderson (Cyclotron Institute, Texas A&M University)Poster
In heavy-ion collisions, the study of recoil jets tagged by high transverse-momentum "direct photons" ($\gamma_{dir}$) should provide a measurement of the partonic energy loss in the hot, dense medium produced in such collisions\footnote{X.-N. Wang, Z. Huang, and I. Sarcevic, Phys. Rev. Lett. 77, 231 (1996)}. Since a $\gamma_{dir}$ does not interact strongly with the medium, it closely...
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Prof. Ivan Kisel (Goethe University Frankfurt, FIAS)Poster
One of the main purposes of the physics program of the future heavy ion experiment CBM (FAIR, Germany) is to understand the properties of strongly interacting matter at very high baryonic densities and to study the possibility of a phase transition to a deconfined and chirally restored phase of quark matter. The experiment will operate at high interaction rates up to 10 MHz, that requires a...
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Dr Maksym Zyzak (GSI)Poster
Short-lived particles that have very small production probability or small branching ratio of the channel suitable for registration are of particular interest in the future heavy-ion experiment CBM at FAIR. Such particles can be reconstructed and investigated only through their decay products.
The KF Particle Finder package was developed for reconstruction and selection of short-lived...
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Ms Zalak Marfatia (Sardar Vallabhbahi National Institute of Technology)Poster
We computed excited state masses of singly heavy $\Lambda_b^{0}$ baryon in the framework of Hypercentral Constituent Quark Model. We use hyper coloumb plus power potential, varying ($\nu$) from S.R.(1/2) to quadratic(2.0), in the calculation of ground and radial excited state masses. After that, orbital excited states are also determine for linear($\nu$=1.0) potential. We also introduced first...
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Michito Okai (Sophia University)Poster
We investigate effects of mini-jet propagation
on collective expansion of the quark gluon plasma (QGP)
and, based on this picture, reinterpret higher harmonics ($v_{n}$) data
in Pb+Pb collisions at the LHC energies.
In ultrarelativistic heavy ion collisions,
a large number of mini-jets are subject to traverse the QGP
and are expected to disturb its collective expansion
due to deposition of... -
Dr Amaresh Jaiswal (GSI Helmholtzzentrum für Schwerionenforschung)Poster
Starting from the Boltzmann equation in the relaxation time approximation and employing a Chapman-Enskog like expansion for the distribution function close to equilibrium, we derive second-order evolution equations for the shear stress tensor and the dissipative charge current for a system of massless quarks and gluons. The transport coefficients are obtained exactly using quantum statistics...
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Zachary Hulcher (Massachusetts Inst. of Technology (US))Poster
Within the context of a hybrid strong/weak coupling model of jet quenching, we study the consequences of the fact that the plasma produced in a heavy ion collision cannot resolve the substructure of a collimated parton shower within it to arbitrary resolution.
We introduce a screening length parameter, $L_{Res}$, proportional to the inverse of the local temperature in the plasma, estimating... -
Mr Mohammad Yousuf Jamal (IIT Gandhinagar, India)Poster
The response functions of a particular medium is a basic tool to understand the properties
of the medium. In the same spirit, Chromo-electric/magnetic response functions (such as
Dielectric permittivity , refractive index , etc.,) can be used to understand the medium
properties of hot QCD/QGP medium. We first obtain the gluon polarisation tensor in a hot
QCD medium which is described in terms... -
Paolo Giuseppe AlbaPoster
Repulsive baryon and meson interactions in HRG models show sizable effects on higher order fluctuations of conserved charges. When compared to lattice QCD simulations, a point-particle formulation of the Hadron-Resonance Gas model is unable to describe the observables as calculated in Lattice GT, even when hithero undetected Quark Model States are implemented into the hadronic spectrum used...
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Roy Lacey (Stony Brook University)Poster
The QCD phase diagram can be mapped out by studying fluctuations and their response
to changes of the temperature and baryon chemical potential. Theoretical studies [1] indicate that the cumulant ratios $C_n/C_m$, used to characterize the fluctuation of conserved charges, provide a valuable probe of deconfinement and chiral dynamics, as well as for identifying the position of the critical end... -
Dr Jie Zhao (Purdue University)Poster
Metastable domains of fluctuating topological charges can change the chirality of quarks and induce local parity violation
in quantum chromodynamics. This can lead to observable charge separation along the strong magnetic field produced in relativistic heavy-ion collisions, a phenomenon called the chiral magnetic effect (CME). The magnetic field is generated by spectator protons and... -
Horst Sebastian Scheid (Johann-Wolfgang-Goethe Univ. (DE))Poster
Dileptons are a prime probe of the deconfined state of strongly interacting matter, the Quark Gluon Plasma (QGP), produced in high energy heavy ion collisions, as they are not affected by secondary hard interactions.
A measurement of the thermal radiation from the QGP in the dielectron intermediate mass region allows to estimate the medium temperature. In this region the main component of the... -
Jean-Bernard RosePoster
Microscopic non-equilibrium dynamics are used to calculate the transport coefficients of dense hadronic matter. Specifically, the shear viscosity to entropy density ratio is investigated, and its temperature dependence between 75 MeV and 175 MeV is explored, and the effects of non-zero baryon and strange chemical potentials are probed. This is important to constrain the value of shear...
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Jason BryslawskyjPoster
An algorithm has been developed for reconstructing high-$p_T$ $\pi_0$s
at large pseudorapidities using the MPC and MPC-EX systems at PHENIX.
The Muon Piston Calorimeter Extension Upgrade (MPC-EX) to PHENIX is a
preshower detector located in front of the MPC, an electromagnetic
calorimeter, placed at large pseudorapidity (3.1<$ \eta $<3.8). The MPC-EX
consists of alternating tungsten... -
Ernst Hellbar (Johann-Wolfgang-Goethe Univ. (DE))Poster
The Time Projection Chamber (TPC) is the main tracking and particle identification detector of the ALICE experiment at the CERN LHC. With the advent of high luminosity data of LHC RUN 2, unexpectedly large local distortions of the drift paths of ionization electrons are observed at the edges of specific readout chambers. These distortions are caused by ions which leak from the amplification...
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Mark Mace (Stony Brook University)Poster
We report on a first computation of non-equilibrium sphaleron transitions in the Glasma created immediately after the collision of ultra-relativistic nuclei[1]. Based on classical-statistical real time lattice gauge theory simulations, we find that the rate of topological transitions is initially strongly enhanced relative to the thermal equilibrium sphaleron transition rate and decays with...
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Klaus Dehmelt (State University of New York Stony Brook (US))Poster
The sPHENIX experiments will explore the properties of the quark gluon plasma via measurements of jets and upsilons. sPHENIX will feature a state of the art tracking system which consists of a highly granular MAPS silicon pixel detector, a silicon strip detector (INTT) and a time projection chamber (TPC).
The tracking system will work in continuous read out at high data collection rates,... -
Veronica Canoa Roman, Veronica Canoa Roman (Centro Invest. Estudios Avanz. IPN (MX)), Dr Veronica Canoa Roman (Stony Brook University)Poster
sPHENIX is an upgrade to the PHENIX detector proposed to explored the quark-gluon plasma formed in heavy ion collisions through measurements of jets and upsilons at RHIC in the 2020's. The experiment will feature a 1.5 Tesla superconducting solenoid magnet which was formerly used by the BaBar experiment. A charged particle tracking system will be placed together with an electromagnetic and...
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Dr Yang-Ting Chien (Massachusetts Institute of Technology), Dr Yang-Ting Chien (Massachusetts Institute of Technology)Poster
We present the first calculations of the momentum sharing and angular separation distributions between the leading subjets inside a reconstructed jet, as well as the jet mass distribution modification in heavy ion collisions. These observables are sensitive to the early and late stages of the in-medium parton shower evolution and allow us to probe the quark-gluon plasma across a wide range of...
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Jaebeom Park (Korea University (KR))Poster
The Compact Muon Solenoid (CMS) observed the strong suppression of excited bottomonia states $\Upsilon(2S)$ and $\Upsilon(3S)$ in PbPb collisions at $\sqrt{s_{NN}}$ = 5.02 TeV. The analysis was done by comparing the excited state yield to the ground state yield, and then comparing the results in PbPb and pp. For $\Upsilon(2S)$ state of the 0-5% centrality and $\Upsilon(3S)$ states of...
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Vinzent Steinberg (FIAS)Poster
SMASH is a new hadronic transport model designed to describe the non-equilibrium evolution of heavy-ion collisions. We briefly introduce the model and show that SMASH reproduces the cross sections and maintains detailed balance. To verify that the dynamics at low energies are modeled correctly, we compare pion and proton spectra to measurements by FOPI and HADES. Furthermore we look at...
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Dr David Tlusty (Rice University)Poster
Some QGP signatures, such as number-of-constituent-quark scaling of $v_{2}$, can be seen to persist down to $\sqrt{s_{NN}}$ = 7.7 GeV, while others, such as suppression $R_{CP}$, show a turn-off behavior at low beam energies. Fixed target collisions in STAR allow the center-of-mass energy to go as low as 4.5 GeV. This would provide an opportunity to measure such signatures down to an energy...
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Paolo Parotto (University of Houston)Poster
Using generalized quark number susceptibilities we obtain continuum extrapolated
lattice QCD results for the free energy in various strangeness sectors and compare it with the expectations from the
hadron resonance gas model. We use these findings to disambiguate between various spectrum tables. Thus we constrain
the abundance of strange mesons and baryons using finite temperature data. This... -
Tristan Haseler (Georgia State University)Poster
Heavy flavor quarks are an important probe of the initial state of the Quark Gluon Plasma formed in heavy-ion collisions.
Bottom and charm quarks are produced early in the collision, primarily through hard interactions, and experience the full time evolution of the medium.
Understanding bottom quark production in $p+p$ collisions gives a baseline reference for studying larger collision... -
Mr Abinash Pun Pun (Ohio University)Poster
The study of asymmetric systems like d+Au is considered useful for distinguishing initial state cold nuclear matter effects from final state QGP effects. Two-particle correlations in highly asymmetric collisions can access jet physics at high $p_T$, possible collective effects at low $p_T$, and the interplay of the two. This poster presents the status of the measurement of $\pi^0 - h^{\pm}$...
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Arabinda Behera (State University of New York (US))Poster
ATLAS measurements of multi-particle azimuthal correlations for produced charged particles in small collision systems (5.02 and 13 TeV $pp$, 5.02 TeV $p$+Pb and low-multiplicity 2.76 TeV Pb+Pb collisions) are presented. The correlations are expressed in terms of cumulants $c_n$, which can be directly related to Fourier harmonics $v_n$. A comparison across different collision systems is...
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Michael Henry Oliver (Yale University (US))Poster
A key topic of interest in studies of jets in heavy ion physics is the path-length dependence of jet-medium interactions. In this contribution, Monte Carlo event simulators are used to estimate the path-length traversed by the recoil jet, under a varying range of trigger conditions. These simulations are then used to make predictions for studies of jet-hadron correlations, where a high pT...
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Mr Yue Hang Leung (Stony Brook University)Poster
The dimuon mass spectrum, unlike-sign as well as like-sign, is a unique
probe to directly access the different stages of a heavy-ion collision.
The unlike-sign intermediate ($1< m_{\mu^+\mu^-}<3$ GeV/$c^2$) and high
($4< m_{\mu^+\mu^-}<8$ GeV/$c^2$) mass regions are dominated by semi-leptonic
decays of open charm and bottom, and therefore provide information about
the heavy flavor dynamics.... -
Chong KimPoster
The proposed sPHENIX detector at the Relativistic Heavy Ion Collider will take proton-proton, proton-nucleus, and nucleus-nucleus collision data in the early 2020s, opening up new opportunities to study a wide variety of QCD systems and processes. Inclusive and correlation observables involving jets, photons, and heavy flavor at midrapidity will provide sensitivity to partonic structure and...
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Neelima Agrawal (IIT- Indian Institute of Technology (IN))Poster
The observation of the modification of hadronic resonance production in heavy-ion collisions allows one to infer the presence of a prolonged hadronic phase after hadronisation. The decay daughters of short-lived resonances suffer re-scattering in the dense hadronic medium, which modifies their correlations and hence the experimentally measured yields. New results on the production of Λ(1520)...
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Israel Portillo (University of Houston)Poster
Currently at the Beam Energy Scan at RHIC experimental efforts are being made to find the QCD critical point. On the theoretical side, the behavior of higher-order susceptibilities of the net-baryon charge from Lattice QCD may allows us to estimate its position via Taylor expansion of the density of states at $\mu_B=0$. However, even if the series expansion continues to higher-orders, there is...
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Andrey KotovPoster
This report is devoted to the study of temperature dependence of shear viscosity in SU(3)-gluodynamics. To calculate shear viscosity we measured the correlation function of the energy-momentum tensor T_{12}T_{12} for a set of temperatures in the region T/T_c \in (0.9, 1.5). The measurements were carried out using multilevel algorithm which considerably improves the accuracy of the data. The...
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Virginia Ruth Bailey (UIUC)Poster
The sPHENIX detector is a proposed upgrade to the PHENIX detector at the Relativistic Heavy Ion Collider (RHIC). The sPHENIX detector will measure properties of quark gluon plasma (QGP) through the study of jets and hard probes. The electromagnetic calorimeter (EMCal) consists of tungsten powder and epoxy blocks with embedded scintillating fibers. The approximately 7 mm radiation length...
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Ingo-Martin Deppner (Physikalisches Institut der Universität Heidelberg)Poster
The CBM experiment aims at exploring the QCD phase diagram at large baryon densities in the beam energy range from 2 A GeV to 11 (35) A GeV at the SIS100 (SIS300) accelerator of FAIR/GSI. For charged particle identification that is required by many observables that are sensitive to the phase structure like collective flow, phase space population of rare hyperons, fluctuations of conserved...
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Takafumi Niida (Wayne State University)Poster
The dipole flow originates from the asymmetry in the initial density distributions either due to projectile-target asymmetry (Cu+Au collisions) or due to the event-by-event fluctuations. Unlike the conventional directed flow that is rapidity-odd in symmetric collisions, the dipole flow is rapidity-even and has weak dependence on the pseudorapidity. The dipole flow has a characteristic of zero...
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Gaku MitsukaPoster
The sPHENIX experiment at the Relativistic Heavy Ion Collider at Brookhaven National Laboratory is designed to explore a vast range of physics areas including heavy quarkonia suppression via the three Υ states and tagging of charm and beauty jets. Among the sPHENIX detector systems, precision tracking inside the 1.5 Tesla BaBar superconducting solenoid plays a crucial role to reduce fake track...
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luis hernandez (Department of Physics, UCT)Poster
The intense magnetic fields produced at the early stages of a heavy ion reaction make it possible to produce photons from processes otherwise not allowed, for instance, the fusion of gluons. In addition, magnetic fields naturally produce an asymmetry in the emission of electromagnetic radiation, hence they can be considered as a source of the large strength of the coefficient $v_2$.
In this...
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Wladyslaw Henryk Trzaska (University of Jyvaskyla (FI))Poster
The upcoming upgrade of the CERN LHC injectors during 2019-20 will boost the luminosity and the collision rate beyond the design parameters for several of the key ALICE detectors including the forward trigger detectors. The nominal Pb-Pb interaction and readout rate for ALICE after LS2 will be of 50 kHz. To remedy this problem the Fast Interaction Trigger (FIT)Êis being designed and...
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Martin Lothar Purschke (Brookhaven National Laboratory (US))Poster
The recently established sPHENIX Collaboration at RHIC is upgrading
the PHENIX detector in a way that will enable a comprehensive
measurement of jets in relativistic heavy ion collisions. The upgrade
will give the experiment full azimuthal coverage within a
pseudorapidity range of $-1.1 < \eta < 1.1$. In addition to measuring
heavy-ion collisions, the new apparatus will provide enhanced... -
Tariq Mahmoud (J)
The CBM fixed-target experiment at FAIR will investigate highly compressed baryonic matter at moderate temperatures in heavy-ion collisions with 2-11 AGeV beam energy for heaviest nuclei at the SIS100 accelerator at FAIR starting in 2022. The CBM experiment aims at understanding and characterizing nuclear matter at high net-baryon densities but moderate temperatures focussing on the...
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Johann Heuser (GSI - Helmholtzzentrum fur Schwerionenforschung GmbH (DE))Poster
The Silicon Tracking System is the central detector in the CBM experiment at FAIR. Operating in the 1 Tm dipole magnetic field, the STS will enable pile-up free detection and momentum measurement of the charged-particles originating from beam-target nuclear interactions at rates between 100 kHz and 10 MHz. It will also allow identifying particle decays occurring within the aperture.
The STS...
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Dr Feng Li (Frankfurt Institute for Advanced Study)Poster
The spinodal instability, i.e. the self-amplified deviation from the equilibrium state during a first order phase transition, of the baryonic rich quark matter is studied by both using the linear response theory and solving the Boltzmann equations with the test particle method. The former approach includes the quantum effect but only works near equilibrium, while the second one is...
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Frank Geurts (Rice University (US))Poster
The first RHIC Beam Energy Scan (BES-I) provided an initial survey of
the QCD phase diagram by acquiring data from Au+Au collisions from
$\sqrt(s_{NN})$ = 7.7 to 62.4 GeV. Based on those results, a second
phase of the BES program, BES-II, has been developed and is scheduled to
run in 2019 and 2020. One of the proposed upgrades to STAR for BES-II
will be the addition of an end-cap... -
Gergely FejosPoster
Thermal evolution of the axial anomaly of QCD is investigated in terms of effective theories with 2+1 flavors. Using the Functional Renormalization Group method, it will be shown that mesonic fluctuations are of great importance from the point of view of the thermal behavior of the 't Hooft determinant term. Results indicate that fluctuations strengthen the axial anomaly at finite temperature...
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Shiori Kajimoto (Osaka University)Poster
In relativistic heavy ion collisions, the suppression of heavy quarkonia, such as charmonia and bottomonia, is considered as one of the important signals for the formation of a quark-gluon plasma. Understanding the behavior of heavy quarkonia in such hot matter would enable us in turn to extract the properties of the quark-gluon plasma from experimental data. And while lattice QCD studies have...
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Paul Stankus (Oak Ridge National Lab)Poster
A prerequisite for producing the Quark Gluon Plasma in heavy-ion collisions is to have a sufficient local energy density, which, traditionally, is estimated via measurements of the produced particle transverse energy ($E_{\mathrm T}$). In hadronic collisions the $E_{\mathrm T}$ is determined by the initial scattering of the partonic constituents of the incoming nuclei as well as...
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Dong Jo Kim (University of Jyvaskyla (FI))Poster
The new multiparticle observables, which are called "Symmetric 2-harmonic 4-particle cumulants"(SC), were recently reported in [1]. These quantify the correlation between the event-by-event fluctuations of two different flow harmonics. Because the correlation between different order flow harmonics responds differently to the initial conditions or(and) $\eta/s$, SC provide a strong constraint...
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Edgar Perez Lezama (Johann-Wolfgang-Goethe Univ. (DE))Poster
Particle production at collider energies is a result of the interplay of perturbative (hard) and non-perturbative (soft) QCD processes. Hence, the measurements of transverse momentum spectra in pp collisions provide baseline tests of perturbative QCD and constraints for a better tuning of models and event generators. In addition, they constitute a valuable reference to study nuclear effects in...
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Dr Li Yi (Yale University)Poster
Underlying-event activity is defined as the soft particle production in proton+proton and proton+nucleus collisions which is not directly related to the final fragmentation of hard-scattered partons. Underlying-event measurements therefore provide a tool to study non-factorizable and non-perturbative phenomena. Systematic measurements of the relationship between the underlying event and jet...
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Mr CAPTAIN R. SINGH (BIRLA INSTITUTE OF TECHNOLOGY AND SCIENCE)Poster
Bottomonium are produced in the heavy ion collisions and their production is modified compared with elementary collisions. This modification in the production of bottomonia happens due to the presence of hot and dense QCD matter, named as quark-gluon plasma (QGP) formed in ultra relativistic heavy ion collisions. We present here a comprehensive model based on color screening, collisional...
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Xiaojun Yao (Duke University)Poster
Heavy quarkonia can be used as probes in heavy-ion collisions since the yield will contain imprint of the initial states and in-medium evolution, which can be used to extract properties of the cold and hot nuclear matters. This use of quarkonium as a probe is complicated by several factors: the competition between dissociation and recombination of quarkonium inside the quark-gluon plasma (QGP)...
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Xinjie Huang (Tsinghua Univ.)Poster
Measurements of quarkonium production have played an important role in understanding the properties of Quark Gluon Plasma (QGP) formed in relativistic heavy-ion collisions. The suppression of quarkonia in the medium due to color screening has been proposed as a direct signature of the QGP formation. However, other effects, such as regeneration of quarkonia by the coalescence of uncorrelated...
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Mr Volodymyr Vovchenko (Frankfurt Institute for Advanced Studies)Poster
An extension of the ideal non-interacting hadron resonance gas (HRG) model
is constructed
which includes
the attractive and repulsive van der Waals (VDW) interactions between baryons.
This VDW-HRG model yields the nuclear liquid-gas transition at low temperatures and high baryon densities.
The VDW parameters $a$ and $b$
are fixed by the ground state properties of nuclear matter,
and the... -
Sigtryggur Hauksson (McGill University)Poster
Photons emitted in heavy-ion collisions are sensitive to the entire history of the system evolution as they are emitted in all stages of the collision. As such they are excellent probes of the out-of-equilibrium nature of a fast evolving system. The degree of
out-of-equilibrium is encoded in the transport coefficients (the shear and bulk viscosities) and the so-called $\delta f$ corrections to... -
Ajay Majethiya (V S PATEL COLLEGE OF ARTS AND SCIENCE, COLLEGE ROAD, BILIMORA, DIST NAVSARI, GUJARAT 396321, INDIA)Poster
Weak decay of beauty baryons in quark-diquark
modelThe weak decays of $\Lambda_{b}$ provide valuable information of the
CKM parameter Vcb, fragmentation and hadronisation within the
framework of quantum chromodynamics. Recently, LHCb has reported
Branching ratios for non-leptonic decay $\Lambda_b^0\to\Lambda_c^+ \pi^-$$ = 4.3\pm 0.51 \times 10^{-3} $. This
experimental measurement... -
Tetsuro Sugiura (University of Tsukuba, Japan)Poster
In heavy-ion collision experiments, the study of event-by-event fluctuations provides a powerful tool to characterize and understand the thermodynamic
properties of the hot and dense QCD matter.
The fluctuations of conserved quantities in a finite phase space rapidity window ($\Delta\eta$), like the net-charge, are predicted to be one of the most sensitive signals of the QGP formation and...
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