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Are flow measurements at SPS reliable?
Several heavy ion experiments at SPS have measured azimuthal distributions of particles with respect to the reaction plane. These distributions are deduced from two-particle azimuthal correlations under the assumption that they result solely from correlations with the reaction plane. In this paper,...
Autores principales: | , , |
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Lenguaje: | eng |
Publicado: |
2000
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Materias: | |
Acceso en línea: | https://dx.doi.org/10.1103/PhysRevC.62.034902 http://cds.cern.ch/record/434341 |
_version_ | 1780895362258567168 |
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author | Borghini, N Dinh, M Ollitrault, Jean Yves |
author_facet | Borghini, N Dinh, M Ollitrault, Jean Yves |
author_sort | Borghini, N |
collection | CERN |
description | Several heavy ion experiments at SPS have measured azimuthal distributions of particles with respect to the reaction plane. These distributions are deduced from two-particle azimuthal correlations under the assumption that they result solely from correlations with the reaction plane. In this paper, we investigate other sources of azimuthal correlations: transverse momentum conservation, which produces back-to-back correlations, resonance decays, HBT correlations and final state interactions. These correlations increase with impact parameter: most of them vary with the multiplicity N like 1/N. When they are taken into account, the experimental results of the NA49 collaboration at SPS are significantly modified. These correlations might also explain an important fraction of the pion directed flow observed by WA98. Our analysis indicates that the methods currently used to measure the flow are not able to produce quantitative results. |
id | cern-434341 |
institution | Organización Europea para la Investigación Nuclear |
language | eng |
publishDate | 2000 |
record_format | invenio |
spelling | cern-4343412019-09-30T06:29:59Zdoi:10.1103/PhysRevC.62.034902http://cds.cern.ch/record/434341engBorghini, NDinh, MOllitrault, Jean YvesAre flow measurements at SPS reliable?Nuclear Physics - TheorySeveral heavy ion experiments at SPS have measured azimuthal distributions of particles with respect to the reaction plane. These distributions are deduced from two-particle azimuthal correlations under the assumption that they result solely from correlations with the reaction plane. In this paper, we investigate other sources of azimuthal correlations: transverse momentum conservation, which produces back-to-back correlations, resonance decays, HBT correlations and final state interactions. These correlations increase with impact parameter: most of them vary with the multiplicity N like 1/N. When they are taken into account, the experimental results of the NA49 collaboration at SPS are significantly modified. These correlations might also explain an important fraction of the pion directed flow observed by WA98. Our analysis indicates that the methods currently used to measure the flow are not able to produce quantitative results.nucl-th/0004026SACLAY-SPHT-T-2000-049oai:cds.cern.ch:4343412000-04-11 |
spellingShingle | Nuclear Physics - Theory Borghini, N Dinh, M Ollitrault, Jean Yves Are flow measurements at SPS reliable? |
title | Are flow measurements at SPS reliable? |
title_full | Are flow measurements at SPS reliable? |
title_fullStr | Are flow measurements at SPS reliable? |
title_full_unstemmed | Are flow measurements at SPS reliable? |
title_short | Are flow measurements at SPS reliable? |
title_sort | are flow measurements at sps reliable? |
topic | Nuclear Physics - Theory |
url | https://dx.doi.org/10.1103/PhysRevC.62.034902 http://cds.cern.ch/record/434341 |
work_keys_str_mv | AT borghinin areflowmeasurementsatspsreliable AT dinhm areflowmeasurementsatspsreliable AT ollitraultjeanyves areflowmeasurementsatspsreliable |