CERN Accelerating science

Article
Report number arXiv:1310.3428
Title Phase-space dependence of particle-ratio fluctuations in Pb+Pb collisions from 20A to 158A GeV beam energy
Author(s) Anticic, T. (Boskovic Inst., Zagreb) ; Baatar, B. (Dubna, JINR) ; Barna, D. (Wigner RCP, Budapest) ; Bartke, J. (Cracow, INP) ; Beck, H. (Frankfurt U.) ; Betev, L. (CERN) ; Bialkowska, H. (Warsaw, Inst. Nucl. Studies) ; Blume, C. (Frankfurt U.) ; Boimska, B. (Warsaw, Inst. Nucl. Studies) ; Book, J. (Frankfurt U.) ; Botje, M. (NIKHEF, Amsterdam) ; Buncic, P. (CERN) ; Christakoglou, P. (NIKHEF, Amsterdam) ; Chung, P. (SUNY, Stony Brook) ; Chvala, O. (Charles U.) ; Cramer, J. (Washington U., Seattle) ; Eckardt, V. (Munich, Max Planck Inst.) ; Fodor, Z. (Wigner RCP, Budapest) ; Foka, P. (Darmstadt, GSI) ; Friese, V. (Darmstadt, GSI) ; Gazdzicki, M. (Frankfurt U. ; Jan Kochanowski U.) ; Grebieszkow, K. (Warsaw U. of Tech.) ; Hohne, C. (Darmstadt, GSI) ; Kadija, K. (Boskovic Inst., Zagreb) ; Karev, A. (CERN) ; Kolesnikov, V. (Dubna, JINR) ; Kowalski, M. (Cracow, INP) ; Kresan, D. (Darmstadt, GSI) ; Laszlo, A. (Wigner RCP, Budapest) ; Lacey, R. (SUNY, Stony Brook) ; van Leeuwen, M. (NIKHEF, Amsterdam) ; Mackowiak-Pawlowska, M. (Frankfurt U. ; Warsaw U. of Tech.) ; Makariev, M. (Sofiya, Inst. Nucl. Res.) ; Malakhov, A. (Dubna, JINR) ; Melkumov, G. (Dubna, JINR) ; Mitrovski, M. (Frankfurt U.) ; Mrowczynski, S. (Jan Kochanowski U.) ; Palla, G. (Wigner RCP, Budapest) ; Panagiotou, A. (Athens U.) ; Peryt, W. (Warsaw U. of Tech.) ; Pluta, J. (Warsaw U. of Tech.) ; Prindle, D. (Washington U., Seattle) ; Puhlhofer, F. (Marburg U., ITP) ; Renfordt, R. (Frankfurt U.) ; Roland, C. (MIT) ; Roland, G. (MIT) ; Rybczynski, M. (Jan Kochanowski U.) ; Rybicki, A. (Cracow, INP) ; Sandoval, A. (Darmstadt, GSI) ; Rustamov, A. (Frankfurt U.) ; Schmitz, N. (Munich, Max Planck Inst.) ; Schuster, T. (Frankfurt U.) ; Seyboth, P. (Munich, Max Planck Inst.) ; Sikler, F. (Wigner RCP, Budapest) ; Skrzypczak, E. (Warsaw U.) ; Slodkowski, M. (Warsaw U. of Tech.) ; Stefanek, G. (Jan Kochanowski U.) ; Stock, R. (Frankfurt U.) ; Strobele, H. (Frankfurt U.) ; Susa, T. (Boskovic Inst., Zagreb) ; Szuba, M. (Warsaw U. of Tech.) ; Varga, D. (Eotvos U.) ; Vassiliou, M. (Athens U.) ; Veres, G. (Wigner RCP, Budapest) ; Vesztergombi, G. (Wigner RCP, Budapest) ; Vranic, D. (Darmstadt, GSI) ; Wlodarczyk, Z. (Jan Kochanowski U.) ; Wojtaszek-Szwarc, A. (Jan Kochanowski U.)
Publication 2014-05-06
Imprint 12 Oct 2013
Number of pages 13
In: Phys. Rev. C 89 (2014) 054902
DOI 10.1103/PhysRevC.89.054902
Subject category Nuclear Physics - Experiment
Accelerator/Facility, Experiment CERN SPS ; NA49
Abstract A novel approach, the identity method, was used for particle identification and the study of fluctuations of particle yield ratios in Pb+Pb collisions at the CERN Super Proton Synchrotron (SPS). This procedure allows to unfold the moments of the unknown multiplicity distributions of protons (p), kaons (K), pions ($\pi$) and electrons (e). Using these moments the excitation function of the fluctuation measure $\nu_{\text{\text{dyn}}}$[A,B] was measured, with A and B denoting different particle types. The obtained energy dependence of $\nu_{\text{dyn}}$ agrees with previously published NA49 results on the related measure $\sigma_{\text{dyn}}$. Moreover, $\nu_{\text{dyn}}$ was found to depend on the phase space coverage for [K,p] and [K,$\pi$] pairs. This feature most likely explains the reported differences between measurements of NA49 and those of STAR in central Au+Au collisions.
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Publication: © 2014-2025 American Physical Society



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