Measurement of the distributions of event-by-event flow harmonics in lead-lead collisions at √S NN = 2.76 TeV with the ATLAS detector at the LHC

The distributions of event-by-event harmonic flow coefficients υ n for n = 2-4 are measured in √s NN = 2.76TeV Pb+Pb collisions using the ATLAS detector at the LHC. The measurements are performed using charged particles with transverse momentum pT > 0.5GeV and in the pseudorapidity range |η|...

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Guardado en:
Detalles Bibliográficos
Publicado: 2013
Materias:
Event-by-event fluctuation
Hadron-Hadron scattering
Harmonic flow
Heavy-ion collision
Unfolding
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_11266708_v2013_n11_p_Aad
http://hdl.handle.net/20.500.12110/paper_11266708_v2013_n11_p_Aad
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_11266708_v2013_n11_p_Aad
record_format dspace
spelling paper:paper_11266708_v2013_n11_p_Aad2023-06-08T16:08:21Z Measurement of the distributions of event-by-event flow harmonics in lead-lead collisions at √S NN = 2.76 TeV with the ATLAS detector at the LHC Event-by-event fluctuation Hadron-Hadron scattering Harmonic flow Heavy-ion collision Unfolding The distributions of event-by-event harmonic flow coefficients υ n for n = 2-4 are measured in √s NN = 2.76TeV Pb+Pb collisions using the ATLAS detector at the LHC. The measurements are performed using charged particles with transverse momentum pT > 0.5GeV and in the pseudorapidity range |η| < 2.5 in a dataset of approximately 7 μb-1 recorded in 2010. The shapes of the υ n distributions suggest that the associated flow vectors are described by a two-dimensional Gaussian function in central collisions for υ 2 and over most of the measured centrality range for υ 3 and υ 4 . Significant deviations from this function are observed for υ 2 in mid-central and peripheral collisions, and a small deviation is observed for υ 3 in mid-central collisions. In order to be sensitive to these deviations, it is shown that the commonly used multi-particle cumulants, involving four particles or more, need to be measured with a precision better than a few percent. The υ n distributions are also measured independently for charged particles with 0.5 < p T < 1 GeV and p T > 1 GeV. When these distributions are rescaled to the same mean values, the adjusted shapes are found to be nearly the same for these two p T ranges. The υ n distributions are compared with the eccentricity distributions from two models for the initial collision geometry: a Glauber model and a model that includes corrections to the initial geometry due to gluon saturation effects. Both models fail to describe the experimental data consistently over most of the measured centrality range. Copyright CERN. 2013 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_11266708_v2013_n11_p_Aad http://hdl.handle.net/20.500.12110/paper_11266708_v2013_n11_p_Aad
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Event-by-event fluctuation
Hadron-Hadron scattering
Harmonic flow
Heavy-ion collision
Unfolding
spellingShingle Event-by-event fluctuation
Hadron-Hadron scattering
Harmonic flow
Heavy-ion collision
Unfolding
Measurement of the distributions of event-by-event flow harmonics in lead-lead collisions at √S NN = 2.76 TeV with the ATLAS detector at the LHC
topic_facet Event-by-event fluctuation
Hadron-Hadron scattering
Harmonic flow
Heavy-ion collision
Unfolding
description The distributions of event-by-event harmonic flow coefficients υ n for n = 2-4 are measured in √s NN = 2.76TeV Pb+Pb collisions using the ATLAS detector at the LHC. The measurements are performed using charged particles with transverse momentum pT > 0.5GeV and in the pseudorapidity range |η| < 2.5 in a dataset of approximately 7 μb-1 recorded in 2010. The shapes of the υ n distributions suggest that the associated flow vectors are described by a two-dimensional Gaussian function in central collisions for υ 2 and over most of the measured centrality range for υ 3 and υ 4 . Significant deviations from this function are observed for υ 2 in mid-central and peripheral collisions, and a small deviation is observed for υ 3 in mid-central collisions. In order to be sensitive to these deviations, it is shown that the commonly used multi-particle cumulants, involving four particles or more, need to be measured with a precision better than a few percent. The υ n distributions are also measured independently for charged particles with 0.5 < p T < 1 GeV and p T > 1 GeV. When these distributions are rescaled to the same mean values, the adjusted shapes are found to be nearly the same for these two p T ranges. The υ n distributions are compared with the eccentricity distributions from two models for the initial collision geometry: a Glauber model and a model that includes corrections to the initial geometry due to gluon saturation effects. Both models fail to describe the experimental data consistently over most of the measured centrality range. Copyright CERN.
title Measurement of the distributions of event-by-event flow harmonics in lead-lead collisions at √S NN = 2.76 TeV with the ATLAS detector at the LHC
title_short Measurement of the distributions of event-by-event flow harmonics in lead-lead collisions at √S NN = 2.76 TeV with the ATLAS detector at the LHC
title_full Measurement of the distributions of event-by-event flow harmonics in lead-lead collisions at √S NN = 2.76 TeV with the ATLAS detector at the LHC
title_fullStr Measurement of the distributions of event-by-event flow harmonics in lead-lead collisions at √S NN = 2.76 TeV with the ATLAS detector at the LHC
title_full_unstemmed Measurement of the distributions of event-by-event flow harmonics in lead-lead collisions at √S NN = 2.76 TeV with the ATLAS detector at the LHC
title_sort measurement of the distributions of event-by-event flow harmonics in lead-lead collisions at √s nn = 2.76 tev with the atlas detector at the lhc
publishDate 2013
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_11266708_v2013_n11_p_Aad
http://hdl.handle.net/20.500.12110/paper_11266708_v2013_n11_p_Aad
_version_ 1768544096409878528

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