Pion, Kaon, and Proton Production in Central Pb-Pb Collisions at √sNN=2.76 TeV

By B. Abelev, L. Hanratty, J. Sarkamo, L. Leistam, J. Milosevic, M. Bregant, M. Marchisone, P. Vyvre, C. Petta, P. L. Guevara and 947 more. 2012

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In this Letter we report the first results on π±, K±, p, and p production at midrapidity (|y|<0.5) in central Pb-Pb collisions at √sNN=2.76  TeV, measured by the ALICE experiment at the LHC. The pT distributions and yields are compared to previous results at √sNN=200  GeV and expectations from hydrodynamic and thermal models. The spectral shapes indicate a strong increase of the radial flow velocity with √sNN, which in hydrodynamic models is expected as a consequence of the increasing particle density. While the K/π ratio is in line with predictions from the thermal model, the p/π ratio is found to be lower by a factor of about 1.5. This deviation from thermal model expectations is still to be understood.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/b19d23b0bd6bcf437f1995b0b2a3c050ae0bb759

Citations in the corpus

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