| Начало > Production of multi-strange hyperons and strange resonances in the NA49 experiment |
| Article | |
| Title | Production of multi-strange hyperons and strange resonances in the NA49 experiment |
| Author(s) |
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 |
| Affiliation | (CERN) |
| Publication | 2001 |
| Imprint | 2001 |
| In: | J. Phys. G 27 (2001) 367-374 |
| DOI | 10.1088/0954-3899/27/3/314 |
| Subject category | Detectors and Experimental Techniques |
| Accelerator/Facility, Experiment | CERN SPS ; NA49 |
| 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 /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). |