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 vn for n = 2– 4 are measured in √sNN = 2.76 TeV Pb+Pb collisions using the ATLAS detector at the LHC. The measurements are performed using charged particles with transverse momentum pT > 0.5 GeV and in the pseudorapidity range |η| <...

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Detalles Bibliográficos
Autores principales: Alconada Verzini, María Josefina, Alonso, Francisco, Anduaga, Xabier Sebastián, Dova, María Teresa, Monticelli, Fernando Gabriel, Tripiana, Martín F., The ATLAS Collaboration
Formato: Articulo
Lenguaje:Inglés
Publicado: 2013
Materias:
Ciencias Exactas
Física
heavy ion collision
harmonic flow
event-by-event fluctuation
unfolding
hadron-hadron scattering
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/78768
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-78768
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
heavy ion collision
harmonic flow
event-by-event fluctuation
unfolding
hadron-hadron scattering
spellingShingle Ciencias Exactas
Física
heavy ion collision
harmonic flow
event-by-event fluctuation
unfolding
hadron-hadron scattering
Alconada Verzini, María Josefina
Alonso, Francisco
Anduaga, Xabier Sebastián
Dova, María Teresa
Monticelli, Fernando Gabriel
Tripiana, Martín F.
The ATLAS Collaboration
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 Ciencias Exactas
Física
heavy ion collision
harmonic flow
event-by-event fluctuation
unfolding
hadron-hadron scattering
description The distributions of event-by-event harmonic flow coefficients vn for n = 2– 4 are measured in √sNN = 2.76 TeV Pb+Pb collisions using the ATLAS detector at the LHC. The measurements are performed using charged particles with transverse momentum pT > 0.5 GeV and in the pseudorapidity range |η| < 2.5 in a dataset of approximately 7 μb−1 recorded in 2010. The shapes of the vn distributions suggest that the associated flow vectors are described by a two-dimensional Gaussian function in central collisions for v2 and over most of the measured centrality range for v3 and v4. Significant deviations from this function are observed for v2 in mid-central and peripheral collisions, and a small deviation is observed for v3 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 vn distributions are also measured independently for charged particles with 0.5 < pT < 1GeV and pT > 1GeV. When these distributions are rescaled to the same mean values, the adjusted shapes are found to be nearly the same for these two pT ranges. The vn 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.
format Articulo
Articulo
author Alconada Verzini, María Josefina
Alonso, Francisco
Anduaga, Xabier Sebastián
Dova, María Teresa
Monticelli, Fernando Gabriel
Tripiana, Martín F.
The ATLAS Collaboration
author_facet Alconada Verzini, María Josefina
Alonso, Francisco
Anduaga, Xabier Sebastián
Dova, María Teresa
Monticelli, Fernando Gabriel
Tripiana, Martín F.
The ATLAS Collaboration
author_sort Alconada Verzini, María Josefina
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 http://sedici.unlp.edu.ar/handle/10915/78768
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