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Article: Fluctuations of anisotropic flow in Pb+Pb collisions at √sNN = 5.02 TeV with the ATLAS detector

TitleFluctuations of anisotropic flow in Pb+Pb collisions at √sNN = 5.02 TeV with the ATLAS detector
Authors
KeywordsHadron-Hadron scattering (experiments)
Heavy-ion collision
Collective flow
Event-by-event fluctuation
Particle correlations and fluctuations
Issue Date2020
PublisherSpringer Verlag (Germany): SCOAP3. The Journal's web site is located at http://www.springer.com/physics/particle+and+nuclear+physics/journal/13130
Citation
Journal of High Energy Physics, 2020, v. 2020 n. 1, article no. 51 How to Cite?
AbstractMulti-particle azimuthal cumulants are measured as a function of centrality and transverse momentum using 470 μb−1 of Pb+Pb collisions at √sNN = 5.02 TeV with the ATLAS detector at the LHC. These cumulants provide information on the event-by-event fluctuations of harmonic flow coefficients vn and correlated fluctuations between two harmonics vn and vm. For the first time, a non-zero four-particle cumulant is observed for dipolar flow, v1. The four-particle cumulants for elliptic flow, v2, and triangular flow, v3, exhibit a strong centrality dependence and change sign in ultra-central collisions. This sign change is consistent with significant non-Gaussian fluctuations in v2 and v3. The four-particle cumulant for quadrangular flow, v4, 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 v2 and v3, and a positive correlation between v2 and v4. 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.
Persistent Identifierhttp://hdl.handle.net/10722/286276
ISSN
2020 Impact Factor: 5.81
2020 SCImago Journal Rankings: 0.998
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorATLAS collaboration-
dc.contributor.authorLo, CY-
dc.contributor.authorParedes Hernandez, D-
dc.contributor.authorTu, Y-
dc.date.accessioned2020-08-31T07:01:39Z-
dc.date.available2020-08-31T07:01:39Z-
dc.date.issued2020-
dc.identifier.citationJournal of High Energy Physics, 2020, v. 2020 n. 1, article no. 51-
dc.identifier.issn1029-8479-
dc.identifier.urihttp://hdl.handle.net/10722/286276-
dc.description.abstractMulti-particle azimuthal cumulants are measured as a function of centrality and transverse momentum using 470 μb−1 of Pb+Pb collisions at √sNN = 5.02 TeV with the ATLAS detector at the LHC. These cumulants provide information on the event-by-event fluctuations of harmonic flow coefficients vn and correlated fluctuations between two harmonics vn and vm. For the first time, a non-zero four-particle cumulant is observed for dipolar flow, v1. The four-particle cumulants for elliptic flow, v2, and triangular flow, v3, exhibit a strong centrality dependence and change sign in ultra-central collisions. This sign change is consistent with significant non-Gaussian fluctuations in v2 and v3. The four-particle cumulant for quadrangular flow, v4, 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 v2 and v3, and a positive correlation between v2 and v4. 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.-
dc.languageeng-
dc.publisherSpringer Verlag (Germany): SCOAP3. The Journal's web site is located at http://www.springer.com/physics/particle+and+nuclear+physics/journal/13130-
dc.relation.ispartofJournal of High Energy Physics-
dc.rightsThis work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.-
dc.subjectHadron-Hadron scattering (experiments)-
dc.subjectHeavy-ion collision-
dc.subjectCollective flow-
dc.subjectEvent-by-event fluctuation-
dc.subjectParticle correlations and fluctuations-
dc.titleFluctuations of anisotropic flow in Pb+Pb collisions at √sNN = 5.02 TeV with the ATLAS detector-
dc.typeArticle-
dc.identifier.emailLo, CY: samuel3@hku.hk-
dc.identifier.emailParedes Hernandez, D: dparedes@hku.hk-
dc.identifier.emailTu, Y: yanjuntu@hku.hk-
dc.identifier.authorityTu, Y=rp01971-
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1007/JHEP01(2020)051-
dc.identifier.scopuseid_2-s2.0-85077847458-
dc.identifier.hkuros313271-
dc.identifier.volume2020-
dc.identifier.issue1-
dc.identifier.spagearticle no. 51-
dc.identifier.epagearticle no. 51-
dc.identifier.isiWOS:000511969100001-
dc.publisher.placeGermany-
dc.identifier.issnl1029-8479-

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