1. Production of multi-strange hyperons and strange resonances in the NA49 experiment
- Author
-
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., and Zimányi, J.
- Subjects
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 - Abstract
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.
- Published
- 2001