Study of the transverse mass spectra of strange particles in Pb–Pb collisions at 158 A GeV/c

• Published in: Journal of physics. G, Nuclear and particle physics Vol. 30; no. 6; pp. 823 - 840
• Main Authors: Collaboration, The NA57, Antinori, F, Bacon, P, Badalà, A, Barbera, R, Belogianni, A, Bhasin, A, Bloodworth, I J, Bombara, M, Bruno, G E, Bull, S A, Caliandro, R, Campbell, M, Carena, W, Carrer, N, Clarke, R F, Dainese, A, Haas, A P de, Rijke, P C de, Bari, D Di, Liberto, S Di, Divià, R, Elia, D, Evans, D, Feofilov, G A, Fini, R A, Ganoti, P, Ghidini, B, Grella, G, Helstrup, H, Hetland, K F, Holme, A K, Jacholkowski, A, Jones, G T, Jovanovic, P, Jusko, A, Kamermans, R, Kinson, J B, Knudson, K, Kolozhvari, A A, Kondratiev, V, Králik, I, Kravčáková, A, Kuijer, P, Lenti, V, Lietava, R, Løvhøiden, G, Manzari, V, Martinská, G, Mazzoni, M A, Meddi, F, Michalon, A, Morando, M, Nappi, E, Navach, F, Norman, P I, Palmeri, A, Pappalardo, G S, Pastirčák, B, Pišút, J, Pišútová, N, Platt, R J, Posa, F, Quercigh, E, Riggi, F, Röhrich, D, Romano, G, Šafařík, K, Šándor, L, Schillings, E, Segato, G, Sené, M, Sené, R, Snoeys, W, Soramel, F, Spyropoulou-Stassinaki, M, Staroba, P, Toulina, T A, Turrisi, R, Tveter, T S, Urbán, J, Valiev, F F, Brink, A van den, Ven, P van de, Vyvre, P Vande, Eijndhoven, N van, Hunen, J van, Vascotto, A, Vik, T, Baillie, O Villalobos, Vinogradov, L, Virgili, T, Votruba, M F, Vrláková, J, Závada, P
• Format: Journal Article
• Language: English
• Published: Bristol IOP Publishing 01.06.2004; Institute of Physics
• Subjects: Exact sciences and technology; High Energy Physics - Phenomenology; Physics; The physics of elementary particles and fields; Mass distribution; Hyperons; Models; Strange particles; Cross sections; Mass spectra
• ISSN: 0954-3899; 1361-6471
• DOI: 10.1088/0954-3899/30/6/011

The Na57 experiment has collected high statistics, high purity samples of K$^0_s$ and $\Lambda, \Xi $ and $\Omega$ hyperons produced in Pb-Pb collisions at 158 A GeV/c. In this paper we present a study of the transverse mass spectra of these particles for a sample of events corresponding to the most central 53 $\%$ of the inelastic Pb-Pb cross-section. We analyse the transverse mass distributions in the framework of the blast-wave model for the full sample and, for the first time at the SPS, as a function of the event centrality.