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 = 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 3 GeV/ as well.
- Received 1 January 2014
- Revised 2 June 2014
DOI:https://doi.org/10.1103/PhysRevC.90.014906
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