Ξ- and Ξ+ production in central Pb + Pb collisions at 158 GeV/c per nucleon

S. V. Afanasiev, T. Anticic, D. Barna, J. Bartke, R. A. Barton, L. Betev, H. Bialkowska, A. Billmeier, C. Blume, C. O. Blyth, B. Boimska, M. Botje, J. Bracinik, R. Bramm, R. Brun, P. Bunči, V. Cerny, J. G. Cramer, P. Csató, P. DinkelakerV. Eckardt, P. Filip, H. G. Fischer, Z. Fodor, P. Foka, P. Freund, V. Friese, J. Gál, M. Gadzicki, G. Georgopoulos, E. Gladysz, S. Hegyi, C. Höhne, G. Igo, P. G. Jones, K. Kadija, A. Karev, V. I. Kolesnikov, T. Kollegger, M. Kowalski, I. Kraus, M. Kreps, M. Van Leeuwen, P. Lévai, A. I. Malakhov, S. Margetis, C. Markert, B. W. Mayes, G. L. Melkumov, A. Mischke, J. Molnár, J. M. Nelson, G. Pálla, A. D. Panagiotou, K. Perl, A. Petridis, M. Pikna, L. Pinsky, F. Pühlhofer, J. G. Reid, R. Renfordt, W. Retyk, C. Roland, G. Roland, A. Rybicki, T. Sammer, A. Sandoval, H. Sann, N. Schmitz, P. Seyboth, F. Siklér, B. Sitar, E. Skrzypczak, G. T.A. Squier, R. Stock, H. Ströbele, T. Susa, I. Szentpétery, J. Sziklai, T. A. Trainor, D. Varga, M. Vassiliou, G. I. Veres, G. Vesztergombi, D. Vrani, S. Wenig, A. Wetzler, C. Whitten, I. K. Yoo, J. Zaranek, J. Zimányi

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67 Citations (Scopus)

Abstract

Results of the production of Ξ- and Ξ+ hyperons are presented for the 10% most central Pb + Pb interactions at 158 GeV/c per nucleon where the average number of participants Npart is about 335. This analysis utilises a global reconstruction procedure, which allows a measurement of 4π integrated yields to be made for the first time. Inverse slope parameters, which are determined from an exponential fit to the transverse mass spectra, are found to be 267 ± 9 MeV and 296 ± 17 MeV for Ξ- and Ξ+ hyperons, respectively. Mid-]rapidity densities (dN/dy) are found to be 1.49 ± 0.08 and 0.33 ± 0.04 particles per event per unit rapidity for Ξ- and Ξ+, respectively. The ratio R(Ξ+-) at mid-rapidity, R(y = Ycm), is found to be 0.22 ± 0.03. Yields integrated to full phase space are found to be 4.12 ± 0.20 and 0.77 ± 0.04 particles per event for Ξ- and Ξ+ hyperons, respectively.

Original languageEnglish
Pages (from-to)275-281
Number of pages7
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume538
Issue number3-4
DOIs
Publication statusPublished - Jul 4 2002

Keywords

  • Anticascade
  • Cascade
  • Heavy-ion collisions
  • Integrated yields
  • Multi-strange hyperons
  • NA49
  • Strangeness enhancement

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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    Afanasiev, S. V., Anticic, T., Barna, D., Bartke, J., Barton, R. A., Betev, L., Bialkowska, H., Billmeier, A., Blume, C., Blyth, C. O., Boimska, B., Botje, M., Bracinik, J., Bramm, R., Brun, R., Bunči, P., Cerny, V., Cramer, J. G., Csató, P., ... Zimányi, J. (2002). Ξ- and Ξ+ production in central Pb + Pb collisions at 158 GeV/c per nucleon. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 538(3-4), 275-281. https://doi.org/10.1016/S0370-2693(02)01970-6