Production of multi-strange hyperons and strange resonances in the NA49 experiment (CROSBI ID 93439)
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Barton, R.A. ; Afanasiev, S.V. ; Antičić, Tome ; Bächler, J. ; Barna, D. ; Barnby, L. S. ; Bartke, J. ; Betev, L. ; Bialkowska, H. ; Billmeier, A. ; Blume, C. ; Blyth, C.O. ; Boimska, B. ; Botje, M. ; Bracinik, J. ; Brady, F.P. ; Bramm, R. ; Brun, R. ; Buncic, P. ; Carr, L. ; Cebra, D. ; Cooper, G.E. ; Cramer, J.G. ; Csató, P. ; Eckhardt, F. ; Ferenc, D. ; Filip, P. ; Fischer, H.G. ; Fodor, Z. ; Foka, P. ; Freund, P. ; Friese, V. ; Ftácnik, J. ; Gál, J. ; Gazdzicki, M. ; Georgopoulos, G. ; Gladysz-Dziadus, E. ; Hegyi, S. ; Hlinka, V. ; Hohne, C. ; Igo, G. Ivanov, M. ; Jacobs, P. ; Janik, R. ; Jones, P.G ; Kadija, Krešo ; Kolesnikov, V.I. ; Kollegger, T. ; Kowalski, M. ; Van Leeuwen, M. ; Lévai, P. ; Malakhov, A.I. ; Margetis, S. ; Markert, C. ; Mayes, B.W. ; Melkumov, G.L. ; Mischke, A. ; Molnár, J. ; Nelson, J.M. ; Odyniec, G.J. ; Pálla, G. ; Panagiotou, A.D. ; Petridis, A. ; Pikna, M. ; Pinsky, L. ; Poskanzer, A.M. ; Prindle, D.J. ; Pühlhofer, F. ; Reid, J.G. ; Renfordt, R. ; Retyk, W. ; Ritter, H.G. ; Röhrich, D. ; Roland, C. ; Roland, G. ; Rybicki, A. ; Sammer, T. ; Sandoval, A. ; Sann, H. ; Schäfer, E. ; Schmitz, N. ; Seyboth, P. ; Sikler, F. ; Sitar, B. ; Skrzypczak, E. ; Snellings, R. ; Squier, G.T.A. ; Stock, R. ; Strmen, P. ; Ströbele, H. ; Šuša, Tatjana ; Szarka, I. ; Szentpétery, I. ; Sziklai, J. ; Toy, M. ; Trainor, T.A. ; Trentalange, S. ; Varga, D. ; Vassiliou, M. ; Veres, G.I. ; Vesztergombi, G. ; Voloshin, S. ; Vranić, D. ; Wang, F. ; Weerasundara, D. D. ; Wenig, S. ; Wetzler, A. ; Whitten, C. ; Xu, N. ; Yates, T.A. ; Yoo, I.K. ; Zimányi, J.
engleski
Production of multi-strange hyperons and strange resonances in the NA49 experiment
The NA49 large-acceptance hadron spectrometer has measured strange and multi-strange hadrons from Pb+Pb and p+p collisions at the CERN SPS. Preliminary results for the transverse mass and rapidity distributions for X and Xi^+ from central Pb+Pb collisions at 158 GeV c^-1 nudeon are presented. Fully integrated yields per event of 4.42+or-0.31 and 0.74+0.04 are found for Xi^- and Xi^+, respectively, leading to a 4 pi Xi^+ Xi^- ratio of 0.17+or-0.02. The ratio Xi^+ Xi^- at mid-rapidity is found to be 0.22+or-0.04, agreeing with previously published values. In addition, preliminary data on the Lambda (1520) and phi (1020) resonances are presented. The Lambda (1520) multiplicity for p+p collisions is found to be 0.012+or-0.003. No signal is observed for Pb+Pb collisions and a production upper limit of 1.36 Lambda (1520) per event indicates an apparent suppression when comparing with scaled p+p data. Integrated phi (1020) yields per event are found to be 7.6+or-1.1 for Pb+Pb and 0.012+or-0.0015 for p+p collisions. No significant shift or broadening of the phi (1020) invariant mass distribution is observed in central Pb+or-Pb collisions.
multi strange hyperons; strange resonances; NA49 xperiment; Pb Pb X; transverse mass distribution; rapidity distribution; phi 1020 resonance; Lambda 1520 resonance; phi 1020 invariant mass distribution
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