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Article
Report number	nucl-ex/0209002
Title	Energy Dependence of $\Lambda$ and $\bar{\Lambda}$ Production at CERN-SPS Energies
Related title	SUPER PROTON SYNCHROTRON
Author(s)	Mischke, A. (Darmstadt, GSI) ; Afanasiev, S.V. ; Anticic, T. ; Baatar, B. ; Barna, D. ; Bartke, J. ; Barton, R.A. ; Behler, M. ; Betev, L. ; Bialkowska, H. ; Billmeier, A. ; Blume, C. ; Blyth, C.O. ; Boimska, B. ; Botje, M. ; Bracinik, J. ; Bramm, R. ; Brun, R. ; Buncic, P. ; Cerny, V. ; Chvala, O. ; Cramer, J.G. ; Csato, P. ; Dinkelaker, P. ; Eckardt, V. ; Filip, P. ; Fischer, H.G. ; Fodor, Z. ; Foka, P. ; Freund, P. ; Friese, V. ; Gal, J. ; Gazdzicki, M. ; Georgopoulos, G. ; Gladysz, E. ; Hegyi, S. ; Hohne, C. ; Igo, G. ; Jones, P.G. ; Kadija, K. ; Karev, A. ; Kolesnikov, V.I. ; Kollegger, T. ; Kowalski, M. ; Kraus, I. ; Kreps, M. ; van Leeuwen, M. ; Levai, P. ; Malakhov, A.I. ; Margetis, S. ; Markert, C. ; Mayes, B.W. ; Melkumov, G.L. ; Meurer, C. ; Mitrovski, M. ; Molnar, J. ; Nelson, John M. ; Palla, G. ; Panagiotou, A.D. ; Perl, K. ; Petridis, A. ; Pikna, M. ; Pinsky, Lawrence S. ; Puhlhofer, F. ; Reid, J.G. ; Renfordt, R. ; Retyk, W. ; Roland, C. ; Roland, G. ; Rybicki, A. ; Sammer, T. ; Sandoval, A. ; Sann, H. ; Schmitz, N. ; Seyboth, P. ; Sikler, F. ; Sitar, B. ; Skrzypczak, E. ; Squier, G.T.A. ; Stock, R. ; Strobele, H. ; Susa, T. ; Szentpetery, I. ; Sziklai, J. ; Trainor, T.A. ; Varga, D. ; Vassiliou, M. ; Veres, G.I. ; Vesztergombi, G. ; Vranic, D. ; Wenig, S. ; Wetzler, A. ; Whitten, C. ; Yoo, I.K. ; Zaranek, J. ; Zimanyi, J.
Publication	2003
Imprint	4 Sep 2002
Number of pages	6
Note	6 pages, 9 figures, QM2002 proceedings, submitted to Nucl. Phys. A
In:	Nucl. Phys. A 715 (2003) 453-457
In:	16th International Conference on Ultra-Relativistic Nucleus-Nucleus Collisions, Nantes, France, 18 - 24 Jul 2002, pp.453-457
DOI	10.1016/S0375-9474(02)01433-1
Subject category	Nuclear Physics - Experiment
Accelerator/Facility, Experiment	CERN SPS ; NA49
Abstract	Rapidity distributions for $\Lambda$ and $\bar{\Lambda}$ hyperons in central Pb-Pb collisions at 40, 80 and 158 A$\cdot$GeV and for ${\rm K}_{s}^{0}$ mesons at 158 A$\cdot$GeV are presented. The lambda multiplicities are studied as a function of collision energy together with AGS and RHIC measurements and compared to model predictions. A different energy dependence of the $\Lambda/\pi$ and $\bar{\Lambda}/\pi$ is observed. The $\bar{\Lambda}/\Lambda$ ratio shows a steep increase with collision energy. Evidence for a $\bar{\Lambda}/\bar{\rm p}$ ratio greater than 1 is found at 40 A$\cdot$GeV.
Copyright/License	Elsevier Science B.V.

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