Pion, kaon, and proton production in central Pb-Pb collisions at √sNN=2.76TeV


Abelev B., Adam J., Adamová D., Adare A., Aggarwal M., Aglieri Rinella G., ...Daha Fazla

Physical Review Letters, cilt.109, sa.25, 2012 (SCI-Expanded) identifier identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 109 Sayı: 25
  • Basım Tarihi: 2012
  • Doi Numarası: 10.1103/physrevlett.109.252301
  • Dergi Adı: Physical Review Letters
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Yıldız Teknik Üniversitesi Adresli: Hayır

Özet

In this Letter we report the first results on π±, K±, p, and p̄ production at midrapidity (|y|<0.5) in central Pb-Pb collisions at √sNN=2.76TeV, measured by the ALICE experiment at the LHC. The pT distributions and yields are compared to previous results at √sNN=200GeV 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. © 2012 CERN. Published by the American Physical Society.