1. Strangeness enhancement at mid-rapidity in Pb–Pb collisions at 158 A GeV/c
- Author
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F. Navach, F. Posa, N. Carrer, R. A. Fini, Giorgio Torrieri, A. Michalon, Franco Meddi, Jozef Urban, S. Szafran, Federico Antinori, G. Tomasicchio, Petr Zavada, Erik H.M. Heijne, Davide Elia, Giovanni Darbo, B.T.H. Knudsen, I. Králik, M. Luptak, G.F. Segato, Michael A. Thompson, B.C. Earl, S. Saladino, Paolo Martinengo, E. Quercigh, Eugenio Cantatore, M.F. Votruba, W. Klempt, G. Rosa, Trine Spedstad Tveter, E. Chesi, Bianca Osculati, A. Kirk, S. Di Liberto, M. A. Mazzoni, G. Romano, Domenico Di Bari, Jean-Charles Fontaine, I. J. Bloodworth, M.E. Michalon-Mentzer, B. Pastirčák, P.I. Norman, G. T. Jones, H. Beker, K. Knudson, W. Beusch, H. Rotscheidt, J. Bohm, M. Dameri, L. Šándor, F. Pellegrini, M. Venables, H. Bakke, Gunnar Løvhøiden, V. Mack, T. Virgili, S. Simone, E. Andersen, D. Huss, Dario Barberis, R.A. Loconsole, E. Nappi, N. Armenise, T.F. Thorsteinsen, T. Kachelhoffer, M.T. Muciaccia, M. Morando, M. Sené, B. Ghidini, A. Jacholkowski, P. Jovanovic, M. Campbell, Haavard Helstrup, W. Snoeys, R. Lietava, David H. Evans, J. Bán, M. G. Catanesi, A.K. Holme, O. Villalobos Baillie, P. Middelkamp, R. A. Ricci, J. Ftáčnik, Pavel Staroba, Rocco Caliandro, Vito Manzari, G. Grella, A. Diaczek, J.B. Kinson, K. Fanebust, A. Volte, R. Sené, K. Piska, Michele Guida, V. Lenti, Leonardo Paolo Rossi, C. Salvo, K. Šafařík, and A. Jusko
- Subjects
Physics ,Nuclear and High Energy Physics ,Particle physics ,Strangeness ,Lambda baryon ,Omega ,Xi baryon ,Nuclear physics ,Transverse mass ,Rapidity ,Nucleon ,Nuclear Experiment ,Glauber ,Particle Physics - Experiment - Abstract
$K^{0}_{s}$, $\Lambda$, $\Xi$, $\Omega$ and negative particle yields and transverse mass spectra have been measured at central rapidity in Pb-Pb and p-Pb collisions at 158 $A$ GeV/$c$. The yields in Pb-Pb interactions % are presented as a function of the collision centrality and compared with those obtained from p-Pb collisions. Strangeness enhancement in Pb-Pb relative to p-Pb collisions increases with the strangeness content of the particle. Going from p-Pb to Pb-Pb, the strange particle yields increase faster than linearly with the number of participants $N_{part}$ up to $N_{part} \approx 100$, thereafter the increase becomes %linear with $N_{part}$. Yields are studied as a function of the number of nucleons participating in the collision $N_{part}$, which is estimated with the Glauber model. From p-Pb to Pb-Pb collisions the particle yields per participant increase substantially. The enhancement is more pronounced for multistrange particles, and exceeds an order of magnitude for the $\Omega$. For a number of participants, $N_{part}$, greater than $100$, however, all yields per participant appear to be constant.
- Published
- 1999