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Flow fluctuations in Pb plus Pb collisions at root s(NN)=5.02 TeV with the ATLAS detector
SUNY Stony Brook, Dept Chem, Stony Brook, NY 11794 USA..
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.ORCID iD: 0000-0003-3867-0336
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.ORCID iD: 0000-0002-8015-7512
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.ORCID iD: 0000-0002-5935-7464
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2019 (English)In: Nuclear Physics A, ISSN 0375-9474, E-ISSN 1873-1554, Vol. 982, p. 323-326Article in journal (Refereed) Published
Abstract [en]

Measurements of four-particle cumulants c(n){4} for n = 1, 2, 3, 4 are presented using 470 mu b(-1) of Pb+Pb collisions at root s(NN) = 5.02 TeV with the ATLAS detector at the LHC. These cumulants provide information on the event-by-event fluctuations of single harmonics p(v(n)). For the first time, a negative c(1){4} is observed. The c(4){4} is found to be negative in central collisions but changes sign around 20-25% centrality. This behavior is consistent with a nonlinear contribution to v(4) that is proportional to v(2)(2). c(2){4} and c(3){4} are calculated using two reference event classes in order to investigate the influence of volume fluctuations. Over most of the centrality range, c(2){4} and c(3){4} are found to be negative, while in the ultra-central collisions, c(2){4} changes sign and becomes positive, suggesting a deviation from Gaussian behavior in the event-by-event fluctuation of v(2). The magnitudes of the sign change are also found to be dependent of the event class definition .

Place, publisher, year, edition, pages
ELSEVIER SCIENCE BV , 2019. Vol. 982, p. 323-326
Keywords [en]
Multi-Particle Correlation, Cumulants, Heavy-ion, Flow Fluctuation
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:kth:diva-245158DOI: 10.1016/j.nuclphysa.2018.09.012ISI: 000457515500066Scopus ID: 2-s2.0-85060180549OAI: oai:DiVA.org:kth-245158DiVA, id: diva2:1294565
Note

QC 20190307

Available from: 2019-03-07 Created: 2019-03-07 Last updated: 2019-08-08Bibliographically approved

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Jensen, BengtOhm, ChristianRipellino, GiuliaSidebo, P. EdvinStrandberg, Jonas

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