Explanation of hadron transverse-momentum spectra in heavy-ion collisions at sNN=2.76 TeV within a chemical nonequilibrium statistical hadronization model

Viktor Begun, Wojciech Florkowski, and Maciej Rybczynski
Phys. Rev. C 90, 014906 – Published 21 July 2014

Abstract

A chemical nonequilibrium version of the statistical hadronization model combined with a single-freeze-out scenario is used to analyze the transverse-momentum spectra of pions, kaons, and protons produced in heavy-ion collisions at sNN = 2.76 TeV. With the statistical parameters found in earlier studies of hadronic ratios and two new geometric parameters determined by the absolute normalization and slopes of the spectra, we obtain a very good agreement between the data and the model predictions. In particular, the enhancement of pions observed at the very low transverse momenta is very well reproduced. In the chemical nonequilibrium approach, this effect may be naturally interpreted as the onset of pion condensation in heavy-ion collisions. We further stress that the chemical nonequilibrium explains not only the proton yield but the proton spectra up to pT= 3 GeV/c as well.

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  • Received 1 January 2014
  • Revised 2 June 2014

DOI:https://doi.org/10.1103/PhysRevC.90.014906

©2014 American Physical Society

Authors & Affiliations

Viktor Begun1,2,*, Wojciech Florkowski1,3,†, and Maciej Rybczynski1,‡

  • 1Institute of Physics, Jan Kochanowski University, PL-25406 Kielce, Poland
  • 2Bogolyubov Institute for Theoretical Physics, 03680 Kiev, Ukraine
  • 3The H. Niewodniczański Institute of Nuclear Physics, Polish Academy of Sciences, PL-31342 Kraków, Poland

  • *viktor.begun@gmail.com
  • wojciech.florkowski@ifj.edu.pl
  • maciej.rybczynski@ujk.edu.pl

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Vol. 90, Iss. 1 — July 2014

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