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The ALICE measurement of K-S(0) and Lambda production at midrapidity in Pb-Pb collisions at root sNN = 2.76 TeV is presented. The transverse momentum (p(T)) spectra are shown for several collision centrality intervals and in the p(T) range from 0: 4 GeV/c (0: 6 GeV/c for Lambda) to 12 GeV/c. The p(T) dependence of the Lambda/K-S(0) ratios exhibits maxima in the vicinity of 3 GeV/c, and the positions of the maxima shift towards higher p(T) with increasing collision centrality. The magnitude of these maxima increases by almost a factor of three between most peripheral and most central Pb-Pb collisions. This baryon excess at intermediate p(T) is not observed in pp interactions at root s = 0.9 TeV and at root s = 7 TeV. Qualitatively, the baryon enhancement in heavy-ion collisions is expected from radial flow. However, the measured p(T) spectra above 2 GeV/c progressively decouple from hydrodynamical-model calculations. For higher values of p(T), models that incorporate the influence of the medium on the fragmentation and hadronization processes describe qualitatively the p(T) dependence of the Lambda/K-S(0) ratio

K0S and Λ Production in Pb-Pb Collisions at √s_NN=2.76  TeV / Abelev, B., Adam, J., Adamova, D., Adare, A.M., Aggarwal, M., Aglieri Rinella, G., Agnello, M., Agocs, A.G., Agostinelli, A., Ahammed, Z., Ahmad, N., Ahmad, A., Ahn, S., Ahn, S.U., Ajaz, M., Akindinov, A., Aleksandrov, D., Alessandro, B., Alici, A., Alkin, A., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - STAMPA. - 111:22(2013). [10.1103/PhysRevLett.111.222301]

K0S and Λ Production in Pb-Pb Collisions at √s_NN=2.76  TeV

Bruno, Giuseppe Eugenio;
2013

Abstract

The ALICE measurement of K-S(0) and Lambda production at midrapidity in Pb-Pb collisions at root sNN = 2.76 TeV is presented. The transverse momentum (p(T)) spectra are shown for several collision centrality intervals and in the p(T) range from 0: 4 GeV/c (0: 6 GeV/c for Lambda) to 12 GeV/c. The p(T) dependence of the Lambda/K-S(0) ratios exhibits maxima in the vicinity of 3 GeV/c, and the positions of the maxima shift towards higher p(T) with increasing collision centrality. The magnitude of these maxima increases by almost a factor of three between most peripheral and most central Pb-Pb collisions. This baryon excess at intermediate p(T) is not observed in pp interactions at root s = 0.9 TeV and at root s = 7 TeV. Qualitatively, the baryon enhancement in heavy-ion collisions is expected from radial flow. However, the measured p(T) spectra above 2 GeV/c progressively decouple from hydrodynamical-model calculations. For higher values of p(T), models that incorporate the influence of the medium on the fragmentation and hadronization processes describe qualitatively the p(T) dependence of the Lambda/K-S(0) ratio
2013
http://journals.aps.org/prl/pdf/10.1103/PhysRevLett.111.222301
K0S and Λ Production in Pb-Pb Collisions at √s_NN=2.76  TeV / Abelev, B., Adam, J., Adamova, D., Adare, A.M., Aggarwal, M., Aglieri Rinella, G., Agnello, M., Agocs, A.G., Agostinelli, A., Ahammed, Z., Ahmad, N., Ahmad, A., Ahn, S., Ahn, S.U., Ajaz, M., Akindinov, A., Aleksandrov, D., Alessandro, B., Alici, A., Alkin, A., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - STAMPA. - 111:22(2013). [10.1103/PhysRevLett.111.222301]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11589/3440
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