Rapidity dependent strangeness measurements in BRAHMS experiment at RHIC
J. H. Lee(Brookhaven National Laboratory), I. G. Bearden(University of Copenhagen), D. Beavis(University of Copenhagen), C. Beşliu(University of Bucharest), B. Budick(University of Bucharest), H. Bøggild(University of Copenhagen), C. Chasman(University of Copenhagen), C. H. Christensen(University of Copenhagen), P. Christiansen(University of Copenhagen), J. Cibor(University of Copenhagen), R. Debbe(Brookhaven National Laboratory), E. Enger(University of Oslo), J. J. Gaardhøje(University of Copenhagen), M. Germinario(University of Copenhagen), K. Hagel(University of Copenhagen), Ole Hansen(University of Copenhagen), Anders Holm(University of Copenhagen), H. Ito(University of Copenhagen), Emil Jakobsen(University of Copenhagen), A. Jipa(University of Copenhagen), F. Jundt(University of Bucharest), J. I. Jørdre(University of Bergen), C.E. Jørgensen(University of Copenhagen), R. Karabowicz(University of Copenhagen), E. J. Kim(Jagiellonian University), T. Kozik(Jagiellonian University), Thomas Meinert Larsen(Jagiellonian University), J. H. Lee(University of Oslo), Y K Lee(Johns Hopkins University), G. Løvhøiden(Johns Hopkins University), Z. Majka(Jagiellonian University), A. Makeev(Jagiellonian University), M. Mikelsen(University of Oslo), M. Murray(University of Oslo), J. B. Natowitz(Texas A&M University), B. S. Nielsen(University of Copenhagen), J. P. Norris(University of Copenhagen), K. Olchanski(University of Kansas), J. W. Olness(Brookhaven National Laboratory), D. Ouerdane(University of Copenhagen), R. Pł aneta(University of Copenhagen), F. Rami(Jagiellonian University), C. Ristea(University of Bucharest), D. Röhrich(University of Bucharest), B. H. Samset(University of Oslo), D. Sandberg(University of Copenhagen), S. Sanders(University of Copenhagen), P. Staszel(University of Copenhagen), T. S. Tveter(University of Copenhagen), F. Videbæk(University of Oslo), R. Wada(Brookhaven National Laboratory), A. Wieloch(Jagiellonian University), Z. Yin(Jagiellonian University), I. S. Zgură(University of Bucharest)
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Abstract
Particle production of charged kaons in central Au+Au collisions at has been studied as a function of rapidity by the BRAHMS collaboration at RHIC. The kaon spectral shapes are described well by an exponential in transverse mass for the rapidity range of 0 ⩽ yK ⩽ 3.3 with smoothly decreasing inverse slopes as the rapidity increases. For the charged kaon to pion ratios, while there is no significant rapidity dependence for the K+/π+ ratio, the K−/π− ratio shows a significant decrease from y ≈ 1 towards higher rapidities. The systematics of K−/K+ and ratios in the measured rapidity range demonstrates a strongly correlated behaviour which can be described by thermal–statistical models.
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