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29 March 2024
 
  » arxiv » 1310.3428

 Article overview


Phase-space dependence of particle-ratio fluctuations in Pb+Pb collisions from 20A to 158A GeV beam energy
T. Anticic ; B. Baatar ; D. Barna ; J. Bartke ; H. Beck ; L. Betev ; H. Białkowska ; C. Blume ; B. Boimska ; J. Book ; M. Botje ; P. Bunčić ; P. Christakoglou ; P. Chung ; O. Chvala ; J. Cramer ; V. Eckardt ; Z. Fodor ; P. Foka ; V. Friese ; M. Gaździcki ; K. Grebieszkow ; C. Höhne ; K. Kadija ; A. Karev ; V. Kolesnikov ; M. Kowalski ; D. Kresan ; A. Laszlo ; R. Lacey ; M. van Leeuwen ; M. Maćkowiak-Pawłowska ; M. Makariev ; A. Malakhov ; G. Melkumov ; M. Mitrovski ; S. Mrówczyński ; G. Pálla ; A. Panagiotou ; W. Peryt ; J. Pluta ; D. Prindle ; F. Pühlhofer ; R. Renfordt ; C. Roland ; G. Roland ; M. Rybczyński ; A. Rybicki ; A. Sandoval ; A. Rustamov ; N. Schmitz ; T. Schuster ; P. Seyboth ; F. Siklér ; E. Skrzypczak ; M. Słodkowski ; G. Stefanek ; R. Stock ; H. Ströbele ; T. Susa ; M. Szuba ; D. Varga ; M. Vassiliou ; G. Veres ; G. Vesztergombi ; D. Vranić ; Z. Włodarczyk ; A. Wojtaszek-Szwarc ;
Date 12 Oct 2013
AbstractA 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 $ u_{ ext{ ext{dyn}}}$[A,B] was measured, with A and B denoting different particle types. The obtained energy dependence of $ u_{ ext{dyn}}$ agrees with previously published NA49 results on the related measure $sigma_{ ext{dyn}}$. Moreover, $ u_{ ext{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.
Source arXiv, 1310.3428
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