Pseudorapidity dependence of anisotropic flow and its decorrelations using long-range multiparticle correlations in Pb-Pb and Xe-Xe collisions

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F24%3A00585196" target="_blank" >RIV/68378271:_____/24:00585196 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/61389005:_____/24:00585196 RIV/68407700:21340/24:00377079

Výsledek na webu

<a href="https://doi.org/10.1016/j.physletb.2024.138477" target="_blank" >https://doi.org/10.1016/j.physletb.2024.138477</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.physletb.2024.138477" target="_blank" >10.1016/j.physletb.2024.138477</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Pseudorapidity dependence of anisotropic flow and its decorrelations using long-range multiparticle correlations in Pb-Pb and Xe-Xe collisions

Popis výsledku v původním jazyce

he pseudorapidity dependence of elliptic (nu(2)), triangular (nu(3)), and quadrangular (nu(4)) flow coefficients of charged particles measured in Pb-Pb collisions at a centre-of-mass energy per nucleon pair of root s(NN) = 5.02 TeV and in Xe-Xe collisions at root s(NN) = 5.44 TeV with ALICE at the LHC are presented. The measurements are performed in the pseudorapidity range -3.5 < eta < 5 for various centrality intervals using two- and multi-particle cumulants with the subevent method. The flow probability density function (p.d.f.) is studied with the ratio of flow coefficient nu(2) calculated with four- and two-particle cumulant, and suggests that the variance of flow p.d.f. is independent of pseudorapidity. The decorrelation of the flow vector in the longitudinal direction is probed using two-particle correlations. The results measured with respect to different reference regions in pseudorapidity exhibit differences, argued to be a result of saturating decorrelation effect above a certain pseudorapidity separation, in contrast to previous publications which assign this observation to non-flow effects. The results are compared to 3 + 1 dimensional hydrodynamic and the AMPT transport model calculations. Neither of the models is able to simultaneously describe the pseudorapidity dependence of measurements of anisotropic flow and its fluctuations. The results presented in this work highlight shortcomings in our current understanding of initial conditions and subsequent system expansion in the longitudinal direction. Therefore, they provide input for its improvement.

Název v anglickém jazyce

Pseudorapidity dependence of anisotropic flow and its decorrelations using long-range multiparticle correlations in Pb-Pb and Xe-Xe collisions

Popis výsledku anglicky

he pseudorapidity dependence of elliptic (nu(2)), triangular (nu(3)), and quadrangular (nu(4)) flow coefficients of charged particles measured in Pb-Pb collisions at a centre-of-mass energy per nucleon pair of root s(NN) = 5.02 TeV and in Xe-Xe collisions at root s(NN) = 5.44 TeV with ALICE at the LHC are presented. The measurements are performed in the pseudorapidity range -3.5 < eta < 5 for various centrality intervals using two- and multi-particle cumulants with the subevent method. The flow probability density function (p.d.f.) is studied with the ratio of flow coefficient nu(2) calculated with four- and two-particle cumulant, and suggests that the variance of flow p.d.f. is independent of pseudorapidity. The decorrelation of the flow vector in the longitudinal direction is probed using two-particle correlations. The results measured with respect to different reference regions in pseudorapidity exhibit differences, argued to be a result of saturating decorrelation effect above a certain pseudorapidity separation, in contrast to previous publications which assign this observation to non-flow effects. The results are compared to 3 + 1 dimensional hydrodynamic and the AMPT transport model calculations. Neither of the models is able to simultaneously describe the pseudorapidity dependence of measurements of anisotropic flow and its fluctuations. The results presented in this work highlight shortcomings in our current understanding of initial conditions and subsequent system expansion in the longitudinal direction. Therefore, they provide input for its improvement.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10303 - Particles and field physics

Projekt

<a href="/cs/project/LM2023040" target="_blank" >LM2023040: Výzkumná infrastruktura pro experimenty v CERN</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2024

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Physics Letters. B

ISSN

0370-2693

e-ISSN

1873-2445

Svazek periodika

850

Číslo periodika v rámci svazku

MAR

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

17

Strana od-do

138477

Kód UT WoS článku

001186201000001

EID výsledku v databázi Scopus

2-s2.0-85184479787