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

Autori
Abelev, B. ; ... ; Antičić, Tome ; ... ; Gotovac, Sven ; ... ; Mudnić, Eugen ; ... ; Planinić, Mirko ; ... ; Simatović, Goran ; ... ; Šuša, Tatjana ; ... ; Vicković, Linda ; ... ; Zyzak, M.

Izvornik
Physical Review Letters (0031-9007) 109 (2012); 252301-1

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
LHC; ALICE; Pb+Pb; 2.76 TeV; pion; kaon; proton; production

Sažetak
In this Letter we report the first results on π±, K±, p, and p̅ 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.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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