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| Titre : |
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$K^-$ and $\bar p$ Spectra for Au+Au Collisions at $\sqrt{s}$ = 200 GeV from STAR, PHENIX and BRAHMS in Comparison to Core-Corona Model Predictions |
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| Auteur : |
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C. Schreiber1, K. Werner1, J. Aichelin1 |
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| Laboratoire : |
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| Résumé : |
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Based on results obtained with event generators we have launched the core-corona model. It describes in a simplified way but quite successfully the centrality dependence of multiplicity and $$ of identified particles observed in heavy-ion reaction at beam energies between $\sqrt{s}$ = 17 GeV and 200 GeV. Also the centrality dependence of the elliptic flow, $v_2$, for all charged and identified particles could be explained in this model. Here we extend this analysis and study the centrality dependence of single particle spectra of $K^-$ and ${\bar p}$ measured by the PHENIX, STAR and BRAHMS collaborations. We find that also for these particles the analysis of the spectra in the core-corona model suffers from differences in the data published by the different experimental groups, notably for the pp collisions. As for protons and $K^+$ for each experience the data agree well with the prediction of the core-corona model but the value of the two necessary parameters depends on the experiments. We show as well that the average momentum as a function of the centrality depends in a very sensitive way on the particle species and may be quite different for particles which have about the same mass. Therefore the idea to interpret this centrality dependence as a consequence of a collective expansion of the system, as done in blast way fits may be premature. |
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| Type de publication : |
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Conférences invitées |
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Date de publication
ou d'écriture : |
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2012 |
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| Date de la présentation : |
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2010 |
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Nom du périodique
Titre de l'ouvrage : |
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Physics of Atomic Nuclei / Yadernaya Fizika |
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| Volume : |
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75 |
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| Page/Article : |
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640-645 |
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| Nom du colloque : |
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6th International Workshop on Critical Point and Onset of Deconfinement |
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| Ville du colloque : |
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Dubna |
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| Pays du colloque : |
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Russie, Fédération De |
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| Date du colloque (début) : |
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23/08/2010 |
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| Date du colloque (fin) : |
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29/08/2010 |
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| Commentaire : |
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Invited talk to the CPOD conference Dubna August 2010 |
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