Elliptic flow of charged particles at midrapidity relative to the spectator plane in Pb-Pb and Xe-Xe collisions

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389005%3A_____%2F23%3A00578997" target="_blank" >RIV/61389005:_____/23:00578997 - isvavai.cz</a>

Alternative codes found

RIV/68378271:_____/23:00578997 RIV/68407700:21340/23:00370363

Result on the web

<a href="https://doi.org/10.1016/j.physletb.2022.137453" target="_blank" >https://doi.org/10.1016/j.physletb.2022.137453</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.physletb.2022.137453" target="_blank" >10.1016/j.physletb.2022.137453</a>

Result language

angličtina

Original language name

Elliptic flow of charged particles at midrapidity relative to the spectator plane in Pb-Pb and Xe-Xe collisions

Original language description

Measurements of the elliptic flow coefficient relative to the collision plane defined by the spectator neutrons v(2) {Psi(SP)} in collisions of Pb ions at center-of-mass energy per nucleon-nucleon pair root s(NN) = 2.76 TeV and Xe ions at root s(NN) = 5.44 TeV are reported. The results are presented for charged particles produced at midrapidity as a function of centrality and transverse momentum for the 5-70% and 0.2-6 GeV/c ranges, respectively. The ratio between v(2) {psi(SP)} and the elliptic flow coefficient relative to the participant plane v(2) {4}, estimated using four-particle correlations, deviates by up to 20% from unity depending on centrality. This observation differs strongly from the magnitude of the corresponding eccentricity ratios predicted by the T(R)ENTo and the elliptic power models of initial state fluctuations that are tuned to describe the participant plane anisotropies. The differences can be interpreted as a decorrelation of the neutron spectator plane and the reaction plane because of fragmentation of the remnants from the colliding nuclei, which points to an incompleteness of current models describing the initial state fluctuations. A significant transverse momentum dependence of the ratio v(2) {Psi(SP)}/v(2) {4} is observed in all but the most central collisions, which may help to understand whether momentum anisotropies at low and intermediate transverse momentum have a common origin in initial state fluctuations. The ratios of v(2) {Psi(SP)} and v(2){4} to the corresponding initial state eccentricities for Xe-Xe and Pb-Pb collisions at similar initial entropy density show a difference of (7.0 +/- 0.9)% with an additional variation of +1.8% when including RHIC data in the T(R)ENTo parameter extraction. These observations provide new experimental constraints for viscous effects in the hydrodynamic modeling of the expanding quark-gluon plasma produced in heavy-ion collisions at the LHC.

Czech name

—

Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10304 - Nuclear physics

Project

<a href="/en/project/LM2018104" target="_blank" >LM2018104: Research Infrastructure for experiments at CERN</a><br>

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2023

Confidentiality

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

Name of the periodical

Physics Letters. B

ISSN

0370-2693

e-ISSN

1873-2445

Volume of the periodical

846

Issue of the periodical within the volume

NOV

Country of publishing house

NL - THE KINGDOM OF THE NETHERLANDS

Number of pages

15

Pages from-to

137453

UT code for WoS article

001088264400001

EID of the result in the Scopus database

2-s2.0-85172706565