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

The WA97 Collaboration:     F. Antinori - et al.

doi:doi:10.1007/s100520000386

2022 Impact factor 4.4

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. Antinori^6, 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. Sándor^6, ⁷ - G. Segato¹⁰ - P. Staroba¹¹ - M. Thompson⁴ - T.F. Thorsteinsen^2, $^\dagger$ $^\dagger$ 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.