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Title: Searching for Minimum in Dependence of Squared Speed-of-Sound on Collision Energy

Experimental results of the rapidity distributions of negatively charged pions produced in proton-proton ( p - p ) and beryllium-beryllium (Be-Be) collisions at different beam momentums, measured by the NA61/SHINE Collaboration at the super proton synchrotron (SPS), are described by a revised (three-source) Landau hydrodynamic model. The squared speed-of-sound parameter c s 2 is then extracted from the width of rapidity distribution. There is a local minimum (knee point) which indicates a softest point in the equation of state (EoS) appearing at about 40 A  GeV/ c (or 8.8 GeV) in c s 2 excitation function (the dependence of c s 2 on incident beam momentum (or center-of-mass energy)). This knee point should be related to the searching for the onset of quark deconfinement and the critical point of quark-gluon plasma (QGP) phase transition.
 [1] ;  [1] ;  [2]
  1. Institute of Theoretical Physics, Shanxi University, Taiyuan, Shanxi 030006, China
  2. Departments of Chemistry & Physics, Stony Brook University, Stony Brook, NY 11794, USA
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Advances in High Energy Physics
Additional Journal Information:
Journal Volume: 2016; Related Information: CHORUS Timestamp: 2016-08-19 01:54:40; Journal ID: ISSN 1687-7357
Hindawi Publishing Corporation
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