E-resources
PDF-
Aglieri Rinella, G; Agostinelli, A; Ahmed, I; Alt, T; Baek, Y W; Barile, F; Bastid, N; Bianchi, L; Blau, D; Bock, F; Busch, O; Cerello, P; Christakoglou, P; Colocci, M; Das, I; Dubey, A K; Estienne, M; Faivre, J; Feldkamp, L; Ferretti, A; Fusco Girard, M; Gallio, M; Gargiulo, C; Garishvili, I; Grossiord, J-Y; Haiduc, M; Hansen, A; Hori, Y; Ippolitov, M; Irfan, M; Ivanov, M; Jachołkowski, A; Jang, H J; Karavicheva, T; Kim, M; Kirsch, S; Kiselev, S; Konevskikh, A; Kretz, M; Krivda, M; Kryshen, E; Kuijer, P G; Kurashvili, P; Kurepin, A B; Langoy, R; La Rocca, P; Lea, R; Lenhardt, M; Lietava, R; Løvhøiden, G; Luparello, G; Ma, R; Martin Blanco, J; Martynov, Y; Masciocchi, S; Mitu, C; Monteno, M; Niculescu, M; Nielsen, B S; Onderwaater, J; Paić, G; Pal, S K; Pesci, A; Pillot, P; Pochybova, S; Polichtchouk, B; Prasad, S K; Rak, J; Raniwala, S; Rathee, D; Rauf, A W; Real, J S; Rodriguez Manso, A; Rohni, S; Sakai, S; Schutz, Y; Segato, G; Serci, S; Shabratova, G; Sharma, S; Singha, S; Skaali, T B; Spyropoulou-Stassinaki, M; Stocco, D; Sultanov, R; Tarantola Peloni, A; Tarazona Martinez, A; Tieulent, R; Trzaska, W H; Tumkin, A; Van Hoorne, J W; Vechernin, V; Verweij, M; Vinogradov, L; Vrláková, J; Wagner, V; Yamaguchi, Y; Yoo, I-K; Zhou, D; Zhu, J
Physical review letters, 2013, Volume: 111, Issue: 22Journal Article
The ALICE measurement of K_{S}^{0} and Λ production at midrapidity in Pb-Pb collisions at sqrts_{NN}=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 Λ) to 12 GeV/c. The p_{T} dependence of the Λ/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 sqrts=0.9 TeV and at sqrts=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 Λ/K_{S}^{0} ratio.
