Phase-space dependence of particle-ratio fluctuations in Pb + Pb collisions from 20A to 158A GeV beam energy
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Anticic-2014-Phase-space dependence.pdf
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Author(s)
RolandG, unther M.
Roland, Christof E
Roland, Gunther M
Date Issued
May 2014
Journal
Physical Review C
Publisher
American Physical Society
Citation
Anticic, T., B. Baatar, J. Bartke, H. Beck, L. Betev, H. Białkowska, C. Blume, et al. “Phase-space dependence of particle-ratio fluctuations in Pb + Pb collisions from 20A to 158A GeV beam energy.” Phys. Rev. C 89, no. 5 (May 2014). © 2014 American Physical Society
Version
Final published version
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 one to measure the moments of the multiplicity distributions of protons (p), kaons (K), pions (π), and electrons (e) in case of incomplete particle identification. Using these moments the excitation function of the fluctuation measure ν[subscript dyn] [A,B] was measured, with A and B denoting different particle types. The obtained energy dependence of ν[subscript dyn] agrees with previously published NA49 results on the related measure σdyn. However, ν[subscript dyn] [K,p] and ν[subscript dyn] [K,π] were found to depend on the phase-space coverage. This feature most likely explains the reported differences between measurements of NA49 and those of STAR in central Au + Au collisions.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
https://doi.org/10.1103/PhysRevC.89.054902
