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Title
Pion, Kaon, and Proton Production in Central Pb--Pb Collisions at sqrt{s_NN} = 2.76 TeV
Author(s)
ALICE Collaboration안설아장행진
Publication Year
2013-03-13
Abstract
In this Letter we report the first results on π±, K±, p and pp¯¯¯ production at mid-rapidity (|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.
Keyword
Pion; Kaon; and Proton Production; Central Pb-Pb Collisions; sqrt{s_NN}=2.76TeV
Journal Title
Physics letters: B
ISSN
0370-2693
DOI
10.1103/PhysRevLett.109.252301
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Appears in Collections:
7. KISTI 연구성과 > 학술지 발표논문
URI
https://repository.kisti.re.kr/handle/10580/14199
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