CERN Accelerating science

Article
Report number arXiv:1101.3250 ; CERN-PH-EP-2011-006
Title Energy dependence of kaon-to-proton ratio fluctuations in central Pb+Pb collisions from sNNsNN = 6.3 to 17.3 GeV
Author(s) NA49 Collaboration  73 人のオーサーを表示
Publication 2011
Imprint 18 Jan 2011
Number of pages 5
Note Comments: 5 pages, 4 figures
5 pages, 4 figures
In: Phys. Rev. C 83 (2011) 061902(R)
DOI 10.1103/PhysRevC.83.061902
Subject category Nuclear Physics - Experiment
Accelerator/Facility, Experiment CERN SPS ; NA49
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+ˉp)(K++K)/(p+¯p) and K+/pK+/p ratios have been measured for the first time by NA49 in central Pb+Pb collisions at 5 SPS energies between sNNsNN= 6.3 GeV and 17.3 GeV. Both ratios exhibit a change of sign in σdynσdyn, a measure of non-statistical fluctuations, around sNNsNN = 8 GeV. Below this energy, σdynσdyn is positive, indicating higher fluctuation compared to a mixed event background sample, while for higher energies, σdynσdyn is negative, indicating correlated emission of kaons and protons. The results are compared to UrQMD calculations which which give a good description at the higher SPS energies, but fail to reproduce the transition to positive values.
Copyright/License Preprint: © 2011-2025 CERN (License: CC-BY-3.0)

Corresponding record in: Inspire
Email contact: tim.schuster@cern.ch


 レコード 生成: 2011-01-18, 最終変更: 2024-05-08


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