System-size dependence of particle-ratio fluctuations in Pb+Pb collisions at 158A GeV

Anticic, T. and Baatar, B. and Barna, Dániel and Bartke, J. and Beck, H. and Betev, L. and Bialkowska, H. and Blume, C. and Bogusz, M. and Boimska, B. and Book, J. and Botje, M. and Buncic, P. and Cetner, T. and Christakoglou, P. and Chung, P. and Chvala, O. and Cramer, J. G. and Eckardt, V. and Fodor, Zoltán and Foka, P. and Friese, V. and Gazdzicki, M. and Grebieszkow, K. and Hohne, C. and Kadija, K. and Karev, A. and Kolesnikov, V. I. and Kollegger, T. and Kowalski, M. and László, András and Pálla, Gabriella and Siklér, Ferenc and Varga, Dezső and Veres, Gábor and Vesztergombi, György (2013) System-size dependence of particle-ratio fluctuations in Pb+Pb collisions at 158A GeV. PHYSICAL REVIEW C, 87 (2). ISSN 2469-9985

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Abstract

New measurements by the NA49 experiment of the centrality dependence of event-by-event fluc- tuations of the particle yield ratios (K++K−)/(π++π−), (p+¯p)/(π++π−), and (K++K−)/(p+¯p) are presented for Pb+Pb collisions at 158A GeV. The absolute values of the dynamical fluctu- ations of these ratios, quantified by the measure σdyn, increase by about a factor of two from central to semi-peripheral collisions. Multiplicity scaling scenarios are tested and found to apply for both the centrality and the previously published energy dependence of the (K++K−)/(π++π−) and (p+¯p)/(π++π−) ratio fluctuations. A description of the centrality and energy dependence of (K++K−)/(p+¯p) ratio fluctuations by a common scaling prescription is not possible since there is a sign change in the energy dependence.

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