Fluctuations of anisotropic flow in Pb+Pb collisions at √s<sub>NN</sub> = 5.02 TeV with the ATLAS detector

Multi-particle azimuthal cumulants are measured as a function of centrality and transverse momentum using 470 µb⁻¹ of Pb+Pb collisions at √s<sub>NN</sub> = 5.02 TeV with the ATLAS detector at the LHC. These cumulants provide information on the event-by-event fluctuations of harmonic flow...

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Detalles Bibliográficos
Autores principales: Alonso, Francisco, Arduh, Francisco Anuar, Dova, María Teresa, Hoya, Joaquín, Monticelli, Fernando Gabriel, Orellana, Gonzalo Enrique, Wahlberg, Hernán Pablo, The ATLAS Collaboration
Formato: Articulo
Lenguaje:Inglés
Publicado: 2020
Materias:
Ciencias Exactas
Física
Hadron-Hadron scattering (experiments)
Heavy-ion collision
Collective flow
Event-by-event fluctuation
Particle correlations and fluctuations
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/125616
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-125616
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Exactas
Física
Hadron-Hadron scattering (experiments)
Heavy-ion collision
Collective flow
Event-by-event fluctuation
Particle correlations and fluctuations
spellingShingle Ciencias Exactas
Física
Hadron-Hadron scattering (experiments)
Heavy-ion collision
Collective flow
Event-by-event fluctuation
Particle correlations and fluctuations
Alonso, Francisco
Arduh, Francisco Anuar
Dova, María Teresa
Hoya, Joaquín
Monticelli, Fernando Gabriel
Orellana, Gonzalo Enrique
Wahlberg, Hernán Pablo
The ATLAS Collaboration
Fluctuations of anisotropic flow in Pb+Pb collisions at √s<sub>NN</sub> = 5.02 TeV with the ATLAS detector
topic_facet Ciencias Exactas
Física
Hadron-Hadron scattering (experiments)
Heavy-ion collision
Collective flow
Event-by-event fluctuation
Particle correlations and fluctuations
description Multi-particle azimuthal cumulants are measured as a function of centrality and transverse momentum using 470 µb⁻¹ of Pb+Pb collisions at √s<sub>NN</sub> = 5.02 TeV with the ATLAS detector at the LHC. These cumulants provide information on the event-by-event fluctuations of harmonic flow coefficients v<sub>n</sub> and correlated fluctuations between two harmonics v<sub>n</sub> and v<sub>m</sub>. 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.
format Articulo
Articulo
author Alonso, Francisco
Arduh, Francisco Anuar
Dova, María Teresa
Hoya, Joaquín
Monticelli, Fernando Gabriel
Orellana, Gonzalo Enrique
Wahlberg, Hernán Pablo
The ATLAS Collaboration
author_facet Alonso, Francisco
Arduh, Francisco Anuar
Dova, María Teresa
Hoya, Joaquín
Monticelli, Fernando Gabriel
Orellana, Gonzalo Enrique
Wahlberg, Hernán Pablo
The ATLAS Collaboration
author_sort Alonso, Francisco
title Fluctuations of anisotropic flow in Pb+Pb collisions at √s<sub>NN</sub> = 5.02 TeV with the ATLAS detector
title_short Fluctuations of anisotropic flow in Pb+Pb collisions at √s<sub>NN</sub> = 5.02 TeV with the ATLAS detector
title_full Fluctuations of anisotropic flow in Pb+Pb collisions at √s<sub>NN</sub> = 5.02 TeV with the ATLAS detector
title_fullStr Fluctuations of anisotropic flow in Pb+Pb collisions at √s<sub>NN</sub> = 5.02 TeV with the ATLAS detector
title_full_unstemmed Fluctuations of anisotropic flow in Pb+Pb collisions at √s<sub>NN</sub> = 5.02 TeV with the ATLAS detector
title_sort fluctuations of anisotropic flow in pb+pb collisions at √s<sub>nn</sub> = 5.02 tev with the atlas detector
publishDate 2020
url http://sedici.unlp.edu.ar/handle/10915/125616
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