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Identity method to study chemical fluctuations in relativistic heavy-ion collisions

Marek Gaździcki, Katarzyna Grebieszkow, Maja Maćkowiak, and Stanisław Mrówczyński
Phys. Rev. C 83, 054907 – Published 17 May 2011
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  • INTRODUCTION
  • MEASURES OF FLUCTUATIONS
  • EFFECT OF MISIDENTIFICATION
  • IDENTITY METHOD
  • EXPERIMENTAL PROCEDURE
  • ACKNOWLEDGEMENTS
  • APPENDICES
    • References

    Abstract

    Event-by-event fluctuations of the chemical composition of the hadronic final state of relativistic heavy-ion collisions carry valuable information on the properties of strongly interacting matter produced in the collisions. However, in experiments incomplete particle identification distorts the observed fluctuation signals. The effect is quantitatively studied and a new technique for measuring chemical fluctuations, the identity method, is proposed. The method fully eliminates the effect of incomplete particle identification. The application of the identity method to experimental data is explained.

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    • Received 24 March 2011

    DOI:https://doi.org/10.1103/PhysRevC.83.054907

    ©2011 American Physical Society

    Authors & Affiliations

    Marek Gaździcki

    • Goethe-Universität Frankfurt, Max-von-Laue Strasse 1, D-60438 Frankfurt am Main, Germany, and Institute of Physics, Jan Kochanowski University, ul. Świętokrzyska 15, PL-25-406 Kielce, Poland

    Katarzyna Grebieszkow and Maja Maćkowiak

    • Faculty of Physics, Warsaw University of Technology, ul. Koszykowa 75, PL-00-662 Warszawa, Poland

    Stanisław Mrówczyński

    • Institute of Physics, Jan Kochanowski University, ul. Świętokrzyska 15, PL-25-406 Kielce, Poland and Sołtan Institute for Nuclear Studies, ul. Hoża 69, PL-00-681 Warszawa, Poland

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    Issue

    Vol. 83, Iss. 5 — May 2011

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    Images

    • Figure 1
      Figure 1
      The distribution of dE/dx with nonoverlapping peaks of pions and kaons (a), which allows unique particle identification, and the distribution with overlapping peaks (b), which does not allow unique identification.Reuse & Permissions
    • Figure 2
      Figure 2
      The measures of chemical fluctuations Φ and Ψ (a) and νdyn (b) as functions of the width of the energy-loss distribution.Reuse & Permissions
    • Figure 3
      Figure 3
      The distributions of observed masses of pions ρπ(m), of kaons ρK(m), and their sum ρ(m) (a) and the corresponding distribution of kaon identity wK (b).Reuse & Permissions
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