/ Experiment-Nucl arXiv:0808.1237

Energy dependence of particle ratio fluctuations in central Pb + Pb collisions from s(NN)**(1/2) = 6.3-GeV to 17.3-GeV

Alt, C. (Frankfurt U.) ; Anticic, T. (Boskovic Inst., Zagreb) ; Baatar, B. (Dubna, JINR) ; Barna, D. (Budapest, RMKI) ; Bartke, J. (Cracow, INP) ; Betev, L. (CERN) ; Bialkowska, H. (Warsaw, Inst. Nucl. Studies) ; Blume, C. (Frankfurt U.) ; Boimska, B. (Warsaw, Inst. Nucl. Studies) ; Botje, M. (NIKHEF, Amsterdam) ; Bracinik, J. (Comenius U.) ; Bramm, R. (Darmstadt, GSI) ; Buncic, P. (CERN) ; Cerny, V. (Comenius U.) ; Christakoglou, P. (Athens U.) ; Chvala, O. (Charles U.) ; Cramer, J.G. (Washington U., Seattle) ; Csato, P. (Budapest, RMKI) ; Dinkelaker, P. (Frankfurt U.) ; Eckardt, V. (Munich, Max Planck Inst.) ; Flierl, D. (Frankfurt U.) ; Fodor, Z. (Budapest, RMKI) ; Foka, P. (Darmstadt, GSI) ; Friese, V. (Darmstadt, GSI) ; Gal, J. (Budapest, RMKI) ; Gazdzicki, M. (Jan Kochanowski U.) ; Genchev, V. (Sofiya, Inst. Nucl. Res.) ; Georgopoulos, G. (Athens U.) ; Gladysz, E. (Cracow, INP) ; Grebieszkow, K. (Warsaw U. of Tech.) ; Hegyi, S. (Budapest, RMKI) ; Hohne, C. (Darmstadt, GSI) ; Kadija, K. (Boskovic Inst., Zagreb) ; Karev, A. (Munich, Max Planck Inst.) ; Kliemant, M. (Frankfurt U.) ; Kniege, S. (Frankfurt U.) ; Kolesnikov, V.I. (Dubna, JINR) ; Kornas, E. (Cracow, INP) ; Korus, R. (Jan Kochanowski U.) ; Kowalski, M. (Cracow, INP) ; Kraus, I. (Darmstadt, GSI) ; Kreps, M. (Comenius U.) ; Kresan, D. (Darmstadt, GSI) ; van Leeuwen, M. (NIKHEF, Amsterdam) ; Levai, P. (Budapest, RMKI) ; Litov, L. (Catania U.) ; Lungwitz, B. (Frankfurt U.) ; Makariev, M. (Sofiya U.) ; Malakhov, A.I. (Dubna, JINR) ; Mateev, M. (Sofiya U.) ; Melkumov, G.L. (Dubna, JINR) ; Mischke, A. (NIKHEF, Amsterdam) ; Mitrovski, M. (Frankfurt U.) ; Molnar, J. (Budapest, RMKI) ; Mrowczynski, St. (Jan Kochanowski U.) ; Nicolic, V. (Boskovic Inst., Zagreb) ; Palla, G. (Budapest, RMKI) ; Panagiotou, A.D. (Athens U.) ; Panayotov, D. (Catania U.) ; Petridis, A. (Athens U.) ; Pikna, M. (Comenius U.) ; Prindle, D. (Washington U., Seattle) ; Puhlhofer, F. (Marburg U.) ; Renfordt, R. (Frankfurt U.) ; Roland, C. (MIT) ; Roland, G. (MIT) ; Rybczynski, M. (Jan Kochanowski U.) ; Rybicki, A. (Cracow, INP) ; Sandoval, A. (Darmstadt, GSI) ; Schmitz, N. (Munich, Max Planck Inst.) ; Schuster, T. (Frankfurt U.) ; Seyboth, P. (Munich, Max Planck Inst.) ; Sikler, F. (Budapest, RMKI) ; Sitar, B. (Comenius U.) ; Skrzypczak, E. (Warsaw U.) ; Stefanek, G. (Jan Kochanowski U.) ; Stock, R. (Frankfurt U.) ; Strobele, H. (Frankfurt U.) ; Susa, T. (Boskovic Inst., Zagreb) ; Szentpetery, I. (Budapest, RMKI) ; Sziklai, J. (Budapest, RMKI) ; Szymanski, P. (Warsaw, Inst. Nucl. Studies) ; Trubnikov, V. (Warsaw, Inst. Nucl. Studies) ; Varga, D. (CERN) ; Vassiliou, M. (Athens U.) ; Veres, G.I. (MIT) ; Vesztergombi, G. (Budapest, RMKI) ; Vranic, D. (Darmstadt, GSI) ; Wetzler, A. (Frankfurt U.) ; Wlodarczyk, Z. (Jan Kochanowski U.) ; Yoo, I.K. (Pusan Natl. U.) ; Zimanyi, J. (Budapest, RMKI)

Published in: Phys.Rev.
Year: 2009
Vol.: C79
Page No: 044910
Pages: 11

Abstract: We present recent measurements of the energy dependence of event-by-event fluctuations in the K/pi and (p + \bar{p})/pi multiplicity ratios in heavy ion collisions at the CERN SPS. The particle ratio fluctuations were obtained for central Pb+Pb collisions at five collision energies, \sqrt{s_{_{NN}}}, between 6.3 and 17.3 GeV. After accounting for the effects of finite-number statistics and detector resolution, we extract the strength of non-statistical fluctuations at each energy. For the K/pi ratio, larger fluctuations than expected for independent particle production are found at all collision energies. The fluctuations in the (p + \bar{p})/pi ratio are smaller than expectations from independent particle production, indicating correlated pion and proton production from resonance decays. For both ratios, the deviation from purely statistical fluctuations shows an increase towards lower collision energies. The results are compared to transport model calculations, which fail to describe the energy dependence of the K/pi ratio fluctuations.

Web-Page: http://inspirebeta.net/record/792773/files/Fig10_20090203.png; http://inspirebeta.net/record/792773/files/Fig1_20080808.png; http://inspirebeta.net/record/792773/files/Fig2_20080807.png; http://inspirebeta.net/record/792773/files/Fig3_20070327.png; http://inspirebeta.net/record/792773/files/Fig4_20090117.png; http://inspirebeta.net/record/792773/files/Fig5_20090113.png; http://inspirebeta.net/record/792773/files/Fig6_20080807.png; http://inspirebeta.net/record/792773/files/Fig7_20090119.png; http://inspirebeta.net/record/792773/files/Fig8_20090119.png; http://inspirebeta.net/record/792773/files/Fig9_20090117.png

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