, Volume 75, Issue 5, pp 640-645
Date: 28 May 2012

K and \(\bar p\) spectra for AuAu collisions at \(\sqrt s = 200\) GeV from STAR, PHENIX, and BRAHMS in comparison to core-corona model predictions

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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 〈p t 〉 of identified particles observed in heavy-ion reactions at beam energies between \(\sqrt s = 17\) and 200 GeV. Also the centrality dependence of the elliptic flow, υ 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 values of the two necessary parameters depend 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.

The text was submitted by the authors in English.