Fluctuations of anisotropic flow in Pb plus Pb collisions at root s(NN)=5.02 TeV with the ATLAS detector

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15310%2F20%3A73601381" target="_blank" >RIV/61989592:15310/20:73601381 - isvavai.cz</a>

Alternative codes found

RIV/68407700:21220/20:00346955 RIV/68407700:21340/20:00346955 RIV/68407700:21670/20:00346955 RIV/00216208:11320/20:10423752

Result on the web

<a href="https://link.springer.com/content/pdf/10.1007/JHEP01(2020)051.pdf" target="_blank" >https://link.springer.com/content/pdf/10.1007/JHEP01(2020)051.pdf</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/JHEP01(2020)051" target="_blank" >10.1007/JHEP01(2020)051</a>

Result language

angličtina

Original language name

Fluctuations of anisotropic flow in Pb plus Pb collisions at root s(NN)=5.02 TeV with the ATLAS detector

Original language description

Multi-particle azimuthal cumulants are measured as a function of centrality and transverse momentum using 470 mu b(-1) of Pb+Pb collisions at root s(NN) = 5.02TeV with the ATLAS detector at the LHC. These cumulants provide information on the event-by-event fluctuations of harmonic flow coefficients v(n) and correlated fluctuations between two harmonics v(n) and v(m). For the first time, a non-zero four-particle cumulant is observed for dipolar flow, v(1). The four-particle cumulants for elliptic flow, v(2), and triangular flow, v(3), exhibit a strong centrality dependence and change sign in ultra-central collisions. This sign change is consistent with significant non-Gaussian fluctuations in v(2) and v(3). The four-particle cumulant for quadrangular flow, v(4), is found to change sign in mid-central collisions. Correlations between two harmonics are studied with three- and four-particle mixed-harmonic cumulants, which indicate an anti-correlation between v(2) and v(3), and a positive correlation between v(2) and v(4). These correlations decrease in strength towards central collisions and either approach zero or change sign in ultra-central collisions. To investigate the possible flow fluctuations arising from intrinsic centrality or volume fluctuations, the results are compared between two different event classes used for centrality definitions. In peripheral and mid-central collisions where the cumulant signals are large, only small differences are observed. In ultra-central collisions, the differences are much larger and transverse momentum dependent. These results provide new information to disentangle flow fluctuations from the initial and final states, as well as new insights on the influence of centrality fluctuations.

Czech name

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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

10303 - Particles and field physics

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2020

Confidentiality

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

Name of the periodical

JOURNAL OF HIGH ENERGY PHYSICS

ISSN

1029-8479

e-ISSN

—

Volume of the periodical

2020

Issue of the periodical within the volume

1

Country of publishing house

IT - ITALY

Number of pages

59

Pages from-to

"051-1"-"051-59"

UT code for WoS article

000511969100001

EID of the result in the Scopus database

2-s2.0-85077847458