Flow fluctuations in Pb plus Pb collisions at √sNN=5.02 TeV with the ATLAS detectorVisa övriga samt affilieringar
Antal upphovsmän: 29192019 (Engelska)Ingår i: Nuclear Physics A, ISSN 0375-9474, E-ISSN 1873-1554, Vol. 982, s. 323-326Artikel i tidskrift (Refereegranskat) 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 .
Ort, förlag, år, upplaga, sidor
2019. Vol. 982, s. 323-326
Nyckelord [en]
Multi-Particle Correlation, Cumulants, Heavy-ion, Flow Fluctuation
Nationell ämneskategori
Subatomär fysik
Identifikatorer
URN: urn:nbn:se:uu:diva-378200DOI: 10.1016/j.nuclphysa.2018.09.012ISI: 000457515500066OAI: oai:DiVA.org:uu-378200DiVA, id: diva2:1293802
Konferens
XXVIIth International Conference on Ultrarelativistic Nucleus-Nucleus Collisions (Quark Matter 2018)
Anmärkning
Title in WoS: Flow fluctuations in Pb plus Pb collisions at root s(NN)=5.02 TeV with the ATLAS detector
For complete list of authors see http://dx.doi.org/10.1016/j.nuclphysa.2018.09.012
2019-03-052019-03-052019-03-05Bibliografiskt granskad