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 /sup +/ from central Pb+Pb collisions at 158 GeV c/sup -1//nudeon are presen...

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Detalles Bibliográficos
Autores principales: Barton, R A, Afanasiev, S V, Anticic, T, Bächler, J, Barna, D, Barnby, L S, Bartke, Jerzy, 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 Y, Freund, P, Friese, V, Ftácnik, J, Gál, J, Gazdzicki, M, Georgopoulos, G, Gladysz-Dziadus, E, Hegyi, S, Hlinka, V, Höhne, C, Igo, G, Ivanov, M, Jacobs, P, Janik, R, Jones, P G, Kadija, K, Kolesnikov, V I, Kollegger, T, Kowalski, M, Van Leeuwen, M, Lévai, Peter, Malakhov, A I, Margetis, S, Markert, C, Mayes, B W, Melkumov, G L, Mischke, A, Molnár, J, Nelson, J M, Odyniec, Grazyna Janina, Pálla, G, Panagiotou, A D, Petridis, A, Pikna, M, Pinsky, L, Poskanzer, A M, Prindle, D J, Pühlhofer, F, Reid, J G, Renfordt, R E, 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, Siklér, F, Sitár, B, Skrzypczak, E, Snellings, R, Squier, G T A, Stock, Reinhard, Strmen, P, Ströbele, H, Susa, T, Szarka, I, Szentpétery, I, Sziklai, J, Toy, M, Trainor, T A, Trentalange, S, Varga, D, Vassiliou, Maria, Veres, G I, Vesztergombi, G, Voloshin, S A, Vranic, D, Wang, F, Weerasundara, D D, Wenig, S, Wetzler, A, Whitten, C, Xu, N, Yates, T A, Yoo, I K, Zimányi, J
Lenguaje:eng
Publicado: 2001
Materias:
Detectors and Experimental Techniques
Acceso en línea:https://dx.doi.org/10.1088/0954-3899/27/3/314
http://cds.cern.ch/record/513278
Descripción
Sumario: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 /sup +/ from central Pb+Pb collisions at 158 GeV c/sup -1//nudeon are presented. Fully integrated yields per event of 4.42+or-0.31 and 0.74+0.04 are found for Xi /sup -/ and Xi /sup +/, respectively, leading to a 4 pi Xi /sup +// Xi /sup -/ ratio of 0.17+or-0.02. The ratio Xi /sup +// Xi /sup -/ 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. (10 refs).

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