Energy dependence of particle ratio fluctuations in central Pb+Pb collisions from [sqrt s [subscript NN]]=6.3 to 17.3 GeV
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Author(s)
Veres, Gabor
Roland, Christof E
Roland, Gunther M
Alternative Title
Energy dependence of particle ratio fluctuations in central Pb+Pb collisions from √sNN=6.3 to 17.3 GeV
Date Issued
April 2009
Journal
Physical Review C
Publisher
American Physical Society
Citation
NA49 Collaboration et al. “Energy dependence of particle ratio fluctuations in central Pb+Pb collisions from [sqrt s [subscript NN]]=6.3 to 17.3 GeV.” Physical Review C 79.4 (2009): 044910. ©2009 The American Physical Society.
Version
Final published version
Abstract
We present measurements of the energy dependence of event-by-event fluctuations in the K/pi and (p+p[over-bar])/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 [subscript 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 nonstatistical 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+p[over-bar])/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 toward lower collision energies. The results are compared to transport model calculations, which fail to describe the energy dependence of the K/piratio fluctuations.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
http://dx.doi.org/10.1103/PhysRevC.79.044910
