Energy dependence of kaon-to-proton ratio fluctuations in central Pb+Pb collisions from [sqrt]sNN=6.3 to 17.3 GeV
Name
Anticic-2011-Energy dependence of.pdf
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Author(s)
Roland, Christof E
Roland, Gunther M
Alternative Title
Energy dependence of kaon-to-proton ratio fluctuations in central Pb+Pb collisions from √sNN=6.3 to 17.3 GeV
Date Issued
June 2011
Journal
Physical Review C
Publisher
American Physical Society
Citation
Anticic, T. et al. “Energy Dependence of Kaon-to-proton Ratio Fluctuations in Central Pb+Pb Collisions from sqrt[s_{NN}]=6.3 to 17.3 GeV.” Physical Review C 83.6 (2011). ©2011 American Physical Society.
Version
Final published version
Abstract
Kaons and protons carry large parts of two conserved quantities: strangeness and baryon number. It is argued that their correlation and thus also fluctuations are sensitive to conditions prevailing at the anticipated parton-hadron phase boundary. Fluctuations of the (K++K-)/(p+p[overbar]) and K+/p ratios have been measured for the first time by NA49 in central Pb+Pb collisions at five CERN Super Proton Synchrotron energies between [sqrt]sNN=6.3 and [sqrt]sNN=17.3 GeV. Both ratios exhibit a change of sign in sigma dyn, a measure of nonstatistical fluctuations, around [sqrt]sNN=8 GeV. Below this energy, sigma dyn is positive, indicating higher fluctuation compared to a mixed event background sample, while for higher energies, sigma dyn is negative, indicating correlated emission of kaons and protons. The results are compared to hadronic transport model calculations which fail to reproduce the energy dependence.
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
https://doi.org/10.1103/PhysRevC.83.061902
