CERN Accelerating science

Article
Report number arXiv:0808.1237
Title Energy dependence of particle ratio fluctuations in central Pb+Pb collisions from $\sqrt{s_{_{NN}}} =$~6.3 to 17.3 GeV
Author(s)

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. (Frankfurt U. ; 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. (Philipps U. Marburg) ; 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. (CERN ; Warsaw, Inst. Nucl. Studies) ; Trubnikov, V. (Warsaw, Inst. Nucl. Studies) ; Varga, D. (Budapest, RMKI ; CERN) ; Vassiliou, M. (Athens U.) ; Veres, G.I. (Budapest, RMKI ; 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)

Publication 2009
Imprint 11 Aug 2008
Number of pages 11
Note Comments: 11 pages, 8 figures
11 pages, 10 figures, update to published version
In: Phys. Rev. C 79 (2009) 044910
DOI 10.1103/PhysRevC.79.044910
Subject category Nuclear Physics - Experiment
Accelerator/Facility, Experiment CERN SPS ; NA49
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.
Copyright/License License



Corresponding record in: Inspire


 Journalen skapades 2008-08-11, och modifierades senast 2024-05-08


APS Published version, local copy:
Download fulltextPDF
Fulltext:
Download fulltextPDF
External link:
Download fulltextPreprint