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Abstract:

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.

Registro:

Documento: Artículo
Título: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
Autor:Aad, G. et al.
Este artículo contiene 2917 autores, consultelos en el artículo en formato pdf.
Filiación: Este artículo contiene 2917 autores con sus filiaciones, consultelas en el artículo en formato pdf.
Palabras clave:Event-by-event fluctuation; Hadron-Hadron scattering; Harmonic flow; Heavy-ion collision; Unfolding
Año:2013
Volumen:2013
Número:11
DOI: http://dx.doi.org/10.1007/JHEP11(2013)183
Título revista:Journal of High Energy Physics
Título revista abreviado:J. High Energy Phys.
ISSN:11266708
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_11266708_v2013_n11_p_Aad

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Citas:

---------- APA ----------
(2013) . 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. Journal of High Energy Physics, 2013(11).
http://dx.doi.org/10.1007/JHEP11(2013)183
---------- CHICAGO ----------
Aad, G. "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" . Journal of High Energy Physics 2013, no. 11 (2013).
http://dx.doi.org/10.1007/JHEP11(2013)183
---------- MLA ----------
Aad, G. "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" . Journal of High Energy Physics, vol. 2013, no. 11, 2013.
http://dx.doi.org/10.1007/JHEP11(2013)183
---------- VANCOUVER ----------
Aad, G. 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. J. High Energy Phys. 2013;2013(11).
http://dx.doi.org/10.1007/JHEP11(2013)183