Transverse Velocity Dependence of the Proton-Antiproton Ratio as a Signature of the QCD Critical Point

M. Asakawa, S. A. Bass, B. Müller, and C. Nonaka
Phys. Rev. Lett. 101, 122302 – Published 19 September 2008

Abstract

The presence of a critical point in the QCD phase diagram can deform the trajectories describing the evolution of the expanding fireball in the μBT phase diagram. If the average emission time of hadrons is a function of transverse velocity, as microscopic simulations of the hadronic freeze-out dynamics suggest, the deformation of the hydrodynamic trajectories will change the transverse velocity (βT) dependence of the proton-antiproton ratio when the fireball passes in the vicinity of the critical point. An unusual βT dependence of the p¯/p ratio in a narrow beam energy window would thus signal the presence of the critical point.

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  • Received 18 March 2008

DOI:https://doi.org/10.1103/PhysRevLett.101.122302

©2008 American Physical Society

Authors & Affiliations

M. Asakawa1,4, S. A. Bass2, B. Müller2,4, and C. Nonaka3,4

  • 1Department of Physics, Osaka University, Toyonaka 560-0043, Japan
  • 2Department of Physics, Duke University, Durham, North Carolina 27708, USA
  • 3Department of Physics, Nagoya University, Nagoya 464-8602, Japan
  • 4Yukawa Institute of Theoretical Physics, Kyoto University, Kyoto 606-8502, Japan

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Issue

Vol. 101, Iss. 12 — 19 September 2008

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