2018 Impact factor 4.843
Particles and Fields
Eur. Phys. J. C 14, 633-641
DOI 10.1007/s100520000386

Transverse mass spectra of strange and multi-strange particles in Pb-Pb collisions at 158 A GeV/c

The WA97 Collaboration

F. Antinori6, 10 - H. Bakke2 - W. Beusch6 - I.J. Bloodworth4 - R. Caliandro1 - N. Carrer10 - D. Di Bari1 - S. Di Liberto12 - D. Elia1 - D. Evans4 - K. Fanebust2 - R.A. Fini1 - J. Ftácnik7 - B. Ghidini1 - G. Grella13 - M. Gulino5 - H. Helstrup 3 - A.K. Holme9 - D. Huss8 - A. Jacholkowski1 - G.T. Jones4 - J.B. Kinson4 - K. Knudson6 - I. Králik7 - V. Lenti1 - R. Lietava7 - R.A. Loconsole1 - G. Løvhøiden9 - V. Manzari1 - M.A. Mazzoni12 - F. Meddi12 - A. Michalon14 - M.E. Michalon-Mentzer14 - M. Morando10 - P.I. Norman4 - B. Pastircák7 - E. Quercigh6 - D. Röhrich2 - G. Romano13 - K. Safarík6 - L. Sándor6, 7 - G. Segato10 - P. Staroba11 - M. Thompson4 - T.F. Thorsteinsen2,$^\dagger$$^\dagger$ Deceased - G.D. Torrieri4 - T.S. Tveter9 - J. Urbán7 - O. Villalobos Baillie4 - T. Virgili13 - M.F. Votruba4 - P. Závada11

1 Dipartimento I.A. di Fisica dell'Università e del Politecnico di Bari and Sezione INFN, Bari, Italy
2 Fysisk institutt, Universitetet i Bergen, Bergen, Norway
3 Høgskolen i Bergen, Bergen, Norway
4 School of Physics and Astronomy, University of Birmingham, Birmingham, UK
5 University of Catania and INFN, Catania, Italy
6 CERN, European Laboratory for Particle Physics, Geneva, Switzerland
7 Institute of Experimental Physics, Slovak Academy of Sciences, Kosice, Slovakia
8 GRPHE, Université de Haute Alsace, Mulhouse, France
9 Fysisk institutt, Universitetet i Oslo, Oslo, Norway
10 Dipartimento di Fisica dell'Università and Sezione INFN, Padua, Italy
11 Institute of Physics, Academy of Sciences of Czech Republic, Prague, Czech Republic
12 Dipartimento di Fisica dell'Università ``La Sapienza'' and Sezione INFN, Rome, Italy
13 Dipartimento di Scienze Fisiche ``E.R. Caianiello'' dell'Università and INFN, Salerno, Italy
14 Institut de Recherches Subatomiques, IN2P3/ULP, Strasbourg, France

Received: 5 January 2000 / Revised version: 28 February 2000 /
Published online: 14 April 2000 - © Springer-Verlag 2000

Abstract
The WA97 experiment has measured the transverse mass ( \ensuremath{m_{\mathrm T}}) spectra for negative hadrons ( h-) and strange particles produced at mid-rapidity in Pb-Pb collisions. The increased statistics of analysed data samples allowed us to perform a study of the spectra of $\mathrm{K^0_{\rm S}}$, $\mathrm{\Lambda}$, $\mathrm{\Xi}$, $\mathrm{\Omega}$ and h- as a function of the collision centrality. The data, which correspond to the most central 40% of the total inelastic cross section, have been divided into four centrality classes according to the estimated number of nucleons taking part in the collision. The \ensuremath{m_{\mathrm T}}  spectra, analysed separately for each centrality bin, exhibit only weak ($\leq$ 15%) centrality dependence. The deviation of the $\mathrm{\Omega}$ inverse slope from the linear dependence on the particle mass is confirmed even for the most central Pb-Pb collisions.


Copyright Società Italiana di Fisica, Springer-Verlag 2000