EPS-HEP2019

Session

Heavy Ion Physics

11 Jul 2019, 09:00

Ghent

Conveners

Heavy Ion Physics

• You Zhou (University of Copenhagen (DK))
• Yen-Jie Lee (Massachusetts Institute of Technology)
• Iwona Grabowska-Bold (AGH University of Science and Technology (PL))
• Guilherme Milhano (LIP-Lisbon & CERN TH)

Heavy Ion Physics

• Yen-Jie Lee (Massachusetts Institute of Technology)
• You Zhou (University of Copenhagen (DK))
• Guilherme Milhano (LIP-Lisbon & CERN TH)
• Iwona Grabowska-Bold (AGH University of Science and Technology (PL))

Heavy Ion Physics

• Yen-Jie Lee (Massachusetts Institute of Technology)
• You Zhou (University of Copenhagen (DK))
• Guilherme Milhano (LIP-Lisbon & CERN TH)
• Iwona Grabowska-Bold (AGH University of Science and Technology (PL))

Heavy Ion Physics

• There are no conveners in this block

629. System and event activity dependences of inclusive jet production with ALICE

Daicui Zhou (Central China Normal University CCNU (CN)), Yongzhen Hou (Central China Normal University CCNU (CN))

11/07/2019, 09:00

Heavy Ion Physics

Parallel talk

Jets are produced by a high momentum transfer of initial partons at high energies. Comparing jet production in pp and nucleus-nucleus collisions will allow us to study the jet-quenching effect caused by the hot and dense QCD medium produced in nucleus-nucleus collisions when energetic partons traverse the medium. In particular, systematic studies of jet production in different multiplicity...

585. Jet Measurements in Heavy Ion Collisions with the ATLAS Experiment

Helena Santos (LIP - Lisbon)

11/07/2019, 09:18

Heavy Ion Physics

Parallel talk

This talk presents the latest jet measurements in 5.02 TeV Pb+Pb collisions with the ATLAS Experiment at the LHC. Jets are direct probes of the quark-gluon plasma produced in heavy-ion collisions and studying how they are modified in the heavy-ion collisions compared to the pp collisions provides insight into their interactions with this QCD medium. The latest jet results from ATLAS shown in...

513. Broadening and saturation effects in dijet azimuthal correlations in p-p and p-Pb collisions at √sNN= 5.02 TeV

Krzysztof Kutak (Instytut Fizyki Jadrowej Polskiej Akademii Nauk)

11/07/2019, 09:38

Heavy Ion Physics

Parallel talk

We demonstrate that the recent forward-forward dijet correlation data measured by the ATLAS collaboration for proton-proton and proton-lead collisions are consistent with the broadening effects due to both the gluon saturation and the resummation of large logarithms of the hard scale (the so-called Sudakov logarithms). We find that both effects are necessary to describe the experimental results.

666. Time evolution of a medium-modified jet

Liliana Apolinario (LIP (PT))

11/07/2019, 09:56

Heavy Ion Physics

Parallel talk

The presence of a hot and dense medium, produced in ultra-relativistic heavy-ion collisions, is known to modify the parton shower evolution. Several observations of the resulting intra-jet activity show significant modifications of what can be considered as a medium-modified jet from a “vacuum” (proton-proton) reference. These modifications, generically known as jet quenching effects, are the...

137. Recent jet results in heavy-ion collisions with CMS

Inna Kucher (Centre National de la Recherche Scientifique (FR))

11/07/2019, 10:14

Heavy Ion Physics

Parallel talk

The quenching of jets in heavy-ion collisions probes the transport properties of the quark-gluon plasma. We present selected recent inclusive jet and photon+jet measurements from the CMS experiment.

772. Relating CGC and TMD factorization frameworks beyond leading twist

Piotr Kotko (Penn State University)

11/07/2019, 10:34

Heavy Ion Physics

Parallel talk

It is known already for some time that the leading power limit of the Color Glass Condensate (CGC) expressions for dijet production can be identified with the (generalized) Transverse Momentum Dependent (TMD) factorization in the small x regime. In the latter formalism, there are several TMD gluon distributions containing distinct Wilson line operators, and corresponding on-shell hard...

628. Machine Learning based jet momentum reconstruction in Pb-Pb collisions measured with ALICE

Rudiger Haake (Yale University (US))

11/07/2019, 10:52

Heavy Ion Physics

Parallel talk

The precise reconstruction of jet transverse momenta in heavy-ion collisions is a challenging task. A major obstacle is the large number of uncorrelated (mainly) low-$p_{\mathrm{T}}$ particles overlaying the jets. Strong region-to-region fluctuations of this background complicate the jet measurement and lead to significant uncertainties.
We developed a novel approach to correct jet momenta (or...

38. On the pair correlations of neutral $K,D,B$ and $B_s$ mesons with close momenta produced in inclusive multiparticle processes

Dr Valery Lyuboshitz (Joint Institute for Nuclear Research, Dubna )

11/07/2019, 11:30

Heavy Ion Physics

Parallel talk

The phenomenological structure of inclusive cross-sections of the production of two neutral $K$ mesons in hadron--hadron, hadron--nucleus and nucleus--nucleus collisions is theoretically studied taking into account the strangeness conservation in strong and electromagnetic interactions. Relations for the dependence of correlations of two short-lived and two long-lived neutral kaons
$K^0_S...

41. Light neutral meson production in the era of precision physics at the LHC

Mike Henry Petrus Sas (Nikhef National institute for subatomic physics (NL))

11/07/2019, 11:48

Heavy Ion Physics

Parallel talk

The production of light neutral mesons in different collision systems is interesting for a variety of reasons: In AA collisions the measurements can provide important information on the energy loss of partons traversing the Quark-Gluon Plasma (QGP) which is formed in heavy-ion collisions at the LHC. Measured in pp collisions, neutral meson spectra serve as a reference for pA and AA collisions....

415. Rapidity distributions of pions in p+p and Pb+Pb collisions at CERN SPS energies

Antoni Marcinek (Polish Academy of Sciences (PL))

11/07/2019, 12:06

Heavy Ion Physics

Parallel talk

Our presentation will be largely based on our recent paper [1].

The centrality and energy dependence of rapidity distributions of pions in Pb+Pb reactions can be understood by imposing local energy-momentum conservation in the longitudinal “fire-streaks” of excited matter. With no tuning nor adjustment to the experimental data, the rapidity distribution of pions produced by the fire-streak...

595. The quark-gluon plasma production from the QCD ground state in the Hamiltonian picture

Roman Pasechnik (Lund university)

11/07/2019, 12:24

Heavy Ion Physics

Parallel talk

A semi-classical Hamiltonian approach can be used to describe the quark-gluon plasma (QGP) production mechanism in heavy-ion collisions in real physical time based upon the existence of a homogeneous initial state being a non-trivial QCD ground-state. An effect ala parametric resonance leading to a decay of the homogeneous gluon condensate into inhomogeneous gluon plasma can be thought as a...

633. Baryon production from small to large collision systems at ALICE

Omar Vazquez Rueda (Lund University (SE))

11/07/2019, 12:42

Heavy Ion Physics

Parallel talk

Studies of the production of light- and heavy-flavour baryons are of prominent importance to characterise the partonic phase created in ultrarelativistic heavy ion collisions and to investigate hadronisation mechanisms at the LHC. Studies performed in p--Pb and pp collisions have revealed unexpected features, qualitatively similar to what is observed in larger collision systems and, in the...

636. (Anti-)nuclei production and flow in pp, p-Pb and Pb-Pb collisions with ALICE

Mr Sebastian Hornung (GSI - Helmholtzzentrum fur Schwerionenforschung GmbH (DE))

11/07/2019, 14:30

Heavy Ion Physics

Parallel talk

High energy pp, p-Pb, and Pb-Pb collisions at the LHC offer a unique opportunity to study the production of light (anti-)nuclei. The study of the production yield of (anti-)nuclei in heavy-ion collisions at LHC energies probes the late stages in the evolution of the hot, dense nuclear matter created in the collision and serves as baseline in the search for exotic multi-baryon states. ...

638. Multiplicity and centre-of-mass energy dependence of light-flavor hadron production in pp, p-Pb, and Pb-Pb collisions with ALICE

Ivan Ravasenga (National Academy of Sciences of Ukraine (UA))

11/07/2019, 14:48

Heavy Ion Physics

Parallel talk

The study of identified hadron production as a function of event multiplicity is a key tool for understanding the similarities and differences between large and small colliding systems.
The multiplicity-dependence of the total yields of identified hadrons as a function of event activity shows a remarkable scaling that covers all the collision systems considered.
The production rates of strange...

643. Recent results on spectator-induced electromagnetic effects in ultrarelativistic light- and heavy-ion collisions

Iwona Anna Sputowska (Polish Academy of Sciences (PL))

11/07/2019, 15:06

Heavy Ion Physics

Parallel talk

We review our studies of spectator-induced electromagnetic (EM) effects on charged pion emission. For heavy-ion Pb+Pb and Au+Au reactions, we formulate a model which associates the size of EM effect with the space-time properties of the system of hot and dense matter formed in the collision. As a result we obtain an estimate for the pion decoupling time which agrees with pion decoupling times...

644. Kaon Isospin Fluctuations in Pb-Pb Collisions at $\sqrt{s_{NN}}$= 2.76 TeV with ALICE at the LHC

Ranjit Nayak (IIT- Indian Institute of Technology (IN))

11/07/2019, 15:24

Heavy Ion Physics

Parallel talk

The first measurements of event-by-event correlated fluctuations of neutral and charged kaons are reported in Pb-Pb collisions at $\sqrt{s_{NN}}$ = 2.76 TeV, which are proposed to be related to isospin fluctuations in the kaon sector. These dynamic fluctuations affect the mechanism of correlated productions of neutral and charged kaons in heavy ion collisions. In this work we have used the...

718. Snapshots of fireballs at freeze-out from heavy-ion collisions at different energies

Dr Ivan Melo (University of Žilina)

11/07/2019, 15:42

Heavy Ion Physics

Parallel talk

Identified hadron spectra from relativistic heavy-ion collisions allow
one to reconstruct the final state of the fireball. In principle, one
could deduce its previous evolution from a back extrapolation of the
final state. It is also important to study the collisions at different
energies, since hot matter at different energy and baryon densities is
created that way. One is then...

324. Production of open heavy flavour hadrons in pPb collisions at LHCb

Yanxi Zhang (CERN)

11/07/2019, 16:30

Heavy Ion Physics

Parallel talk

A rich set of open heavy flavour states is observed by LHCb in pPb collisions collected at 5 and 8.16 TeV nucleon-nucleon centre-of-mass energies. Thanks to the LHCb forward acceptance that is complementary to general purpose detectors, heavy-flavor hadrons can be studied down to zero transverse momentum. This talk presents production measurements of beauty hadrons and open charm states...

605. Investigating charm and beauty production and elliptic flow with leptons in Pb--Pb with ALICE

Martin Andreas Volkl (Eberhards Karls Universiy Tubingen (DE))

11/07/2019, 16:48

Heavy Ion Physics

Parallel talk

Heavy quarks (charm and beauty) constitute unique probes for the hot and dense QCD medium produced in heavy-ion collisions: the Quark-Gluon Plasma (QGP). They are mainly produced in hard scattering processes among partons, which occur immediately after the nuclei crossing with a time-scale shorter than the QGP formation time. Therefore, they witness the full evolution of the medium loosing...

449. Measurement of open-charmed hadron production in Au+Au collisions at $\sqrt{s_{\mathrm{NN}}}$ = 200 GeV with the STAR experiment

Mr Robert Licenik (Nuclear Physics Institute, Czech Academy of Sciences)

11/07/2019, 17:06

Heavy Ion Physics

Parallel talk

In ultrarelativistic heavy-ion collisions at RHIC energies, the charm quarks are predominantly produced in initial hard partonic scatterings. Therefore, they experience the entire evolution of the hot and dense medium produced in these collisions, known as the Quark-Gluon Plasma (QGP), and make a very valuable probe. The STAR experiment is capable of studying the production of charm quarks and...

229. Probing heavy quark dynamics in PbPb collisions with CMS

Gabor Veres (Eotvos Lorand University (HU))

11/07/2019, 17:24

Heavy Ion Physics

Parallel talk

Measurements of heavy flavour hadrons in PbPb collisions provide information about the heavy quark dynamics inside the quark-gluon plasma (QGP). Heavy quarks are sensitive to the transport properties of the medium and may interact with the QCD matter differently from light quarks. At low pT, heavy quarks provide a direct window on the in-medium QCD force. At high pT, the comparison of results...

656. Attenuation of heavy flavors in a dense medium

Boris Kopeliovich (UTFSM)

11/07/2019, 17:44

Heavy Ion Physics

Parallel talk

Unexpectedly strong suppression of heavy flavored mesons, produced with high transverse momenta in heavy ion collisions, is caused by final state interactions in the created dense medium. Gluon bremsstrahlung by a highly virtual heavy quark ceases shortly after the hard collision in accordance with perturbative QCD calculations and LEP measurements of the fragmentation function....

609. Study of $R_{\mathrm{A}\mathrm{A}}$ and $v_2$ of non-strange D mesons and D-jet production in Pb--Pb collisions with ALICE

Fabrizio Grosa (Politecnico di Torino (IT))

11/07/2019, 18:02

Heavy Ion Physics

Parallel talk

The LHC heavy-ion physics program aims at investigating the properties of the Quark-Gluon Plasma (QGP) formed in such collisions. Heavy quarks (charm and beauty) are regarded as efficient probes to study and characterize the QGP, as they are created on a very short time scale in initial hard processes and subsequently experience the entire system evolution interacting with the medium...

607. Measurement of ${\mathrm{\Lambda }}_{\mathrm{c}}$ baryons and D${}_{\mathrm{s}}^{+}$ mesons in Pb--Pb collisions with ALICE

Lucas Anne Vermunt (Utrecht University (NL))

12/07/2019, 09:00

Heavy Ion Physics

Parallel talk

The study of heavy-flavour (charm and beauty) production is important to understand the properties of the Quark-Gluon Plasma (QGP) formed in ultra-relativistic heavy-ion collisions, since heavy quarks are produced in the initial stages of the collisions and subsequently interact with the medium throughout its evolution.

In the QGP, strange quarks are expected to be abundantly produced and...

778. J/ψ production in hadron scattering: three-pomeron contribution

Marat Siddikov (Universidad Santa Maria)

12/07/2019, 09:18

Heavy Ion Physics

Parallel talk

In this presentation we discuss the contribution of the three-pomeron configurations to quarkonia production in proton-proton collisions. This mechanism provides a natural explanation of the elevated multiplicities of the produced charged hadrons in the events with production of charmonia. The suggested mechanism gets dominant contribution from the region which can be theoretically described...

322. Quarkonia production in pPb and PbPb collisions at LHCb

Giacomo Graziani (INFN, Sezione di Firenze (IT))

12/07/2019, 09:36

Heavy Ion Physics

Parallel talk

We present LHCb results on quarkonia production in proton-lead collisions, using the data collected at 5.02 and 8.16 TeV nucleon-nucleon centre-of-mass energies, covering forward (pPb configuration) and backward (Pbp configuration) rapidities. Measurements include charmonia, where the prompt and from-b-decay components are disentangled, and bottomonia states. The large increase in size of the...

445. Quarkonium production measured by the STAR experiment

Dr Leszek Kosarzewski (Czech Technical University in Prague)

12/07/2019, 09:54

Heavy Ion Physics

Parallel talk

Quark-gluon plasma and it's properties can be studied with quarkonium states used as a probe. Both $J/\psi$ and $\mathrm{{\rm Y}}$ states dissociate if a sufficiently high temperature is reached in the plasma. Since these quarkonium states have different binding energies, they are expected to dissociate at different temperatures, which is expected to lead to the so-called sequential suppression...

610. Quarkonium measurements at forward rapidity with ALICE at the LHC

Florian Damas (Centre National de la Recherche Scientifique (FR))

12/07/2019, 10:12

Heavy Ion Physics

Parallel talk

Heavy quarks are produced at the first instant of a nucleus-nucleus collision and therefore are an important tool to study the subsequent high energy-density medium formed in ultra-relativistic heavy-ion collisions. A series of experimental efforts for understanding the properties of the Quark-Gluon Plasma (QGP), a medium consisting of a deconfined state of quarks and gluons, are based on...

616. J/$\psi$ production measurements in pp, p-Pb and Pb-Pb collisions at mid-rapidity using the ALICE detector at LHC

Ingrid Mckibben Lofnes (University of Bergen (NO))

12/07/2019, 10:30

Heavy Ion Physics

Parallel talk

J/$\psi$ production provides a particular sensitivity to the medium which can be produced in heavy-ion collisions at ultrarelativistic energies as delivered by the LHC. The vacuum production is modelled by a reference measured in proton-proton collisions and potential initial-state effects can be constrained using p--Pb collisions in the same collision-energy regime.

In this contribution...

325. Heavy-Flavour production in fixed-target mode with LHCb

Felipe Andres Garcia Rosales (Centre National de la Recherche Scientifique (FR))

12/07/2019, 11:30

Heavy Ion Physics

Parallel talk

LHCb has the unique capability to study collisions of the LHC beams on fixed targets. Internal gas targets of helium, neon and argon have been used so far to collect samples corresponding to integrated luminosities up to 0.1 pb-1. An upgraded target, allowing a wider choice of target gas species and an increase in the gas density by up to two orders of magnitude, is planned to be installed for...

558. Constraining the gluon nuclear content with heavy-flavour production at the LHC

Jean-Philippe Lansberg (IPN Orsay, Paris Saclay U. / IN2P3-CNRS)

12/07/2019, 11:50

Heavy Ion Physics

Parallel talk

We report on our study showing that heavy-flavour production at the LHC can strongly improve our knowledge of the gluon content of the heavy nuclei. We have indeed observed that the nuclear effects encoded in both most recent global fits of nuclear parton densities at next-to-leading order (nCTEQ15 and EPPS16) gives a good account of the LHC proton-lead data. Thanks to a Bayesian-reweighting...

205. Production of electroweak bosons in Pb+Pb, p+Pb and pp collisions with the ATLAS detector

Mariusz Przybycien (AGH Univesity of Science and Technology (PL))

12/07/2019, 12:08

Heavy Ion Physics

Parallel talk

Electroweak bosons produced in ultrarelativistic heavy-ion collisions serve as excellent probes of the collision geometry and centrality. Their production rates should be unaffected by initial-state effects. Due to the correlation between the kinematics of quarks from incoming nuclei and the rapidity of produced electroweak bosons, they also provide insight into nuclear modifications of parton...

618. Low-mass dielectron measurements Pb--Pb collisions with ALICE at the LHC

Raphaelle Bailhache (Johann-Wolfgang-Goethe Univ. (DE))

12/07/2019, 12:28

Heavy Ion Physics

Parallel talk

The production of low-mass dielectrons is the most promising tools for the understanding of the chiral symmetry restoration and of the thermodynamical properties of the Quark-Gluon Plasma (QGP) created in ultra-relativistic heavy-ion collisions. Since dielectrons are unaffected by strong final-state interactions and emitted during all stages of the collision, they carry information about the...

757. $eA$ collisions at the LHeC and nuclear parton densities

Anna Stasto (Penn State)

12/07/2019, 12:46

Heavy Ion Physics

Parallel talk

The Large Hadron-electron Collider (LHeC) is a proposed upgrade of the LHC at CERN. It consists of an ERL providing electrons to collide with the HL-LHC, HE-LHC and the FCC-hh ion beams. It will achieve per nucleon centre-of-mass energies 0.8-2.2 TeV, respectively, and luminosities about ${10}^{33}$ cm${}^{-2}$ s${}^{-1}$ The LHeC and its possible successors will extend the kinematic plane in...

204. Observation of light-by-light scattering and new results from ultra-peripheral heavy-ion collisions in the ATLAS experiment

Yahya Tayalati (Universite Mohammed V (MA))

13/07/2019, 09:00

Heavy Ion Physics

Parallel talk

Light-by-light (LbyL) scattering, $\gamma \gamma \to \gamma \gamma$, is a very rare process allowed in Quantum Electrodynamics via a loop diagram. The precise measurement of this process is potentially sensitive to contributions from Beyond Standard Model. Despite the small cross-section, the LbyL scattering can be observed in ultra-peripheral high energy heavy-ion collisions due to strong...

365. Photonic billiards in ultra-peripheral heavy-ion collisions

Mariola Kłusek-Gawenda (IFJ PAS)

13/07/2019, 09:18

Heavy Ion Physics

Parallel talk

So far light-by-light scattering ($\gamma \gamma \to \gamma \gamma$) was not accessible for experiments because the corresponding cross section is rather low. Measurements of diphotons in ultra-peripheral collisions (UPCs) of lead-lead have been reported recently by the ATLAS [1] and CMS Collaborations [2]. Our theoretical results based on equivalent photon approximation in the impact parameter...

7. Inclusive dijet photoproduction in ultraperipheral heavy-ion collisions at the LHC in next-to-leading order QCD

Michael Klasen

13/07/2019, 09:36

Heavy Ion Physics

Parallel talk

We present a calculation of the cross section of inclusive dijet photoproduction in ultraperipheral Pb-Pb collisions at the LHC using next-to-leading order perturbative QCD. We demonstrate that our theoretical calculations provide a good description of various kinematic distributions measured by the ATLAS collaboration. We find that the calculated dijet photoproduction cross section is...

367. Do electromagnetic effects survive in the production of lepton pairs in nucleus-nucleus collisions?

Antoni Szczurek (Institute of Nuclear Physics)

13/07/2019, 09:54

Heavy Ion Physics

Parallel talk

We calculate cross sections for di-lepton photoproduction in ultrarelativistic heavy-ion collisions from low (SPS) to high (LHC) energy.
We study the invariant-mass distributions of dileptons produced in ultrarelativistic heavy-ion collisions at very low pair transverse momenta, $P_T<0.15$ GeV. Specifically, we investigate the interplay of thermal radiation with initial photon annihilation...

75. Multiplicity dependence of azimuthal particle correlations as a probe of collectivity in deep inelastic electron-proton collisions at HERA

Dhevan Raja Gangadharan (Lawrence Berkeley National Lab. (US))

13/07/2019, 10:12

Heavy Ion Physics

Parallel talk

Recent observations at RHIC and the LHC of two- and multi-particle correlations in high multiplicity relativistic proton-proton and proton-ion collisions and similarity of the results to those observed in central heavy-ion collisions are often interpreted as an evidence for collective particle production in small collision systems. These results motivate a study in even smaller systems, such...

549. Measurement of long-range correlations in pp collisions at $\sqrt{s}=$ 13 TeV with ALICE at the LHC

Junlee Kim (Chonbuk National University (KR))

13/07/2019, 10:32

Heavy Ion Physics

Parallel talk

The observed azimuthal modulations of long-range correlations in pseudorapidity in small systems like pp or p-Pb collisions show strikingly similar features to those seen in heavy ion collisions. Many theoretical approaches to interpreting this effect have been developed. However, it is still unclear whether these long-range correlations are due to final
or initial state effects. To further...

699. Searching for the critical point of strongly interacting matter in nucleus-nucleus collisions at CERN SPS

Dr Nikolaos Davis (Polish Academy of Sciences (PL))

13/07/2019, 11:30

Heavy Ion Physics

Parallel talk

One of the primary goals of the NA61/SHINE experiment at CERN SPS is the detection of the critical point (CP) of strongly interacting matter. In the interests of this search, an energy (beam momentum 13A – 150A GeV/c) and system size (p+p, p+Pb, Be+Be, Ar+Sc, Xe+La) scan is being performed.

A number of observables are being considered as possible signatures of the CP. These include...

203. Azimuthal anisotropy in Pb+Pb, Xe+Xe and p+Pb collisions and vn-pt correlations in Pb+Pb and p+Pb collisions with the ATLAS experiment

Tomasz Bold (AGH Univ. of Science and Technology, Krakow)

13/07/2019, 11:48

Heavy Ion Physics

Parallel talk

ATLAS measurements of differential and global Fourier harmonics of charged particles ($v_n$) in 5.02 TeV Pb+Pb and 5.44 TeV Xe+Xe collisions in a wide range of transverse momenta (up to 60 GeV), pseudorapidity (|$\eta$|<2.5) and collision centrality (0-80%) are presented. The higher order harmonics, sensitive to fluctuations in the initial state, are measured up to n=7 using the two-particle...

630. Measurements of $p_{\mathrm{T}}$-differential $v_2$ and $v_3$ using multi-particle cumulants in Pb-Pb and Xe-Xe collisions

Vytautas Vislavicius (University of Copenhagen (DK))

13/07/2019, 12:08

Heavy Ion Physics

Parallel talk

Anisotropic flow coefficients $v_n$ have been used as a tool to probe the initial conditions and transport properties of the strongly interacting matter produced in heavy-ion collisions. In this talk we report on the measurements of $p_{\mathrm{T}}$-differential $v_2$ and $v_3$ coefficients for charged hadrons using two-and multi-particle cumulants in Pb-Pb collisions at...

631. Pseudorapidity dependence of anisotropic flow in heavy ion collisions with ALICE

Freja Thoresen (University of Copenhagen (DK))

13/07/2019, 12:26

Heavy Ion Physics

Parallel talk

Anisotropic flow, characterised by the flow coefficients $v_n$, is one of the probes used to study the properties of the strongly interacting Quark-Gluon Plasma formed in ultra-relativitic heavy-ion collisions. These flow coefficients are usually measured by correlations between two or more particles.

We present results on the pseudorapidity ($\eta$) dependence of...

632. Non-linear flow modes of identified particles in Pb-Pb collisions at 5.02 TeV

Naghmeh Mohammadi (CERN)

13/07/2019, 12:44

Heavy Ion Physics

Parallel talk

The study of flow coefficients and in particular their higher orders, provides important constraints on the initial conditions and transport properties of the QGP. It has been shown that higher order flow coefficients ($n>3$) have significant contribution from lower order initial spatial anisotropies giving rise to non-linear flow modes. Thus, these non-linear observables probe the...