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Energy Dependence of K/π, p/π, and K/p Fluctuations in Au+Au Collisions from sNN−−−√ = 7.7 to 200 GeV

Abstract : A search for the quantum chromodynamics (QCD) critical point was performed by the STAR experiment at the Relativistic Heavy Ion Collider, using dynamical fluctuations of unlike particle pairs. Heavy-ion collisions were studied over a large range of collision energies with homogeneous acceptance and excellent particle identification, covering a significant range in the QCD phase diagram where a critical point may be located. Dynamical K/π, p/π, and K/p fluctuations as measured by the STAR experiment in central 0-5% Au+Au collisions from center-of-mass collision energies sNN−−−√ = 7.7 to 200 GeV are presented. The observable νdyn was used to quantify the magnitude of the dynamical fluctuations in event-by-event measurements of the K/π, p/π, and K/p pairs. The energy dependences of these fluctuations from central 0-5% Au+Au collisions all demonstrate a smooth evolution with collision energy.
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Submitted on : Friday, October 24, 2014 - 11:10:39 AM
Last modification on : Thursday, February 7, 2019 - 2:56:19 PM

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N.M. Abdelwahab, W. Borowski, S. Kabana. Energy Dependence of K/π, p/π, and K/p Fluctuations in Au+Au Collisions from sNN−−−√ = 7.7 to 200 GeV. Physical Review C, American Physical Society, 2015, 92, pp.021901. ⟨10.1103/PhysRevC.92.021901⟩. ⟨in2p3-01077227⟩

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