Energy and centrality dependence of anti-p and p production and the anti-Lambda/anti-p ratio in Pb+Pb collisions between 20A GeV and 158A GeV

(NA49 Collaboration) Alt, C; Anticic, T; Baatar, B; Barna, D; Bartke, J; Betev, L; Bialkowska, H; Blume, C; Boimska, B; Botje, M; Bracinik, J; Bramm, R; Buncic, P; Cerny, V; Christakoglou, P; Chvala, O; Cramer, JG; Csato, P; Dinkelaker, P; Eckardt, V; Flierl, D; Fodor, Z; Foka, P; Friese, V; Gal, J; Gazdzicki, M; Genchev, V; Georgopoulos, G; Gladysz, E; Grebieszkow, K; Hegyi, S; Hohne, C; Kadija, K; Karev, A; Kliemant, M; Kniege, S; Kolesnikov, VI; Kornas, E; Korus, R; Kowalski, M; Kraus, I; Kreps, M; Laslo, A; van Leeuwen, M; Levai, P; Litov, L; Lungwitz, B; Makariev, M; Malakhov, AI; Mateev, M; Melkumov, GL; Mischke, A; Mitrovski, M; Molnar, J; Mrowczynski, S; Nicolic, V; Palla, G; Panagiotou, AD; Panayotov, D; Petridis, A; Pikna, M; Prindle, D; Puhlhofer, F; Renfordt, R; Roland, C; Roland, G; Rybczynski, M; Rybicki, A; Sandoval, A; Schmitz, N; Schuster, T; Seyboth, P; Sikler, F; Sitar, B; Skrzypczak, E; Stefanek, G; Stock, R; Strabel, C; Strobele, H; Susa, T; Szentpetery, I; Sziklai, J; Szymanski, P; Trubnikov, V; Varga, D; Vassiliou, M; Veres, GI; Vesztergombi, G; Vranic, D; Wetzler, A; Wlodarczyk, Z; Yoo, IK; Zimanyi, J; (2006) Energy and centrality dependence of anti-p and p production and the anti-Lambda/anti-p ratio in Pb+Pb collisions between 20A GeV and 158A GeV. Physical Review C, 73 (4). 044910/1-044910/10. ISSN 0556-2813

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Official URL: http://journals.aps.org/prc/abstract/10.1103/PhysR...

Abstract

The transverse mass mt distributions for antiprotons are measured at midrapidity for minimum bias Pb+Pb collisions at 158A GeV and for central Pb+Pb collisions at 20A, 30A, 40A, and 80A GeV beam energies in the fixed target experiment NA49 at the CERN SPS. The rapidity density dn/dy, inverse slope parameter T, and mean transverse mass <mt> derived from the mt distributions are studied as a function of the incident energy and the collision centrality and compared to the relevant data on proton production. The shapes of the mt distributions of anti-p and p are very similar. The ratios of the particle yields, anti-p/p and anti-Lambda/anti-p, are also analyzed. The anti-p/p ratio exhibits an increase with decreasing centrality and a steep rise with increasing beam energy. The anti-Lambda/anti-p ratio increases beyond unity with decreasing beam energy.

Item Type:

Article

Uncontrolled Keywords:

CERN; NA49; transverse mass; proton; anti-proton; anti-Lambda; centrality dependence; energy dependence

Subjects:

NATURAL SCIENCES > Physics

Divisions:

Division of Experimental Physics

Projects: