NDLI: Net-proton measurements at RHIC and the quantum chromodynamics phase diagram

Content Provider	Springer Nature Link
Author	Mohanty, Bedangadas
Copyright Year	2014
Abstract	Two measurements related to the proton and antiproton production near midrapidity in $\sqrt {s_{{NN}}} = 7.7$ , 11.5, 19.6, 27, 39, 62.4 and 200 GeV Au+Au collisions using the STAR detector at the Relativistic Heavy Ion Collider (RHIC) are discussed. At intermediate impact parameters, the net-proton midrapidity dv $_{1}$/dy, where v $_{1}$ and y are directed flow and rapidity, respectively, shows non-monotonic variation as a function of beam energy. This non-monotonic variation is characterized by the presence of a minimum in dv $_{1}$/dy between $\sqrt {s_{NN}} = 11.5$ and 19.6 GeV and a change in the sign of dv $_{1}$/dy twice between $\sqrt {s_{{NN}}}$ = 7.7 and 39 GeV. At small impact parameters the product of the moments of net-proton distribution, kurtosis × variance (κ σ $^{2}$) and skewness × standard deviation (S σ) are observed to be significantly below the corresponding measurements at large impact parameter collisions for $\sqrt {s_{{NN}}}$ = 19.6 and 27 GeV. The κ σ $^{2}$ and S σ values at these beam energies deviate from the expectations from Poisson statistics and that from a hadron resonance gas model. Both these measurements have implications towards understanding the quantum chromodynamics (QCD) phase structures, the first-order phase transition and the critical point in the high baryonic chemical potential region of the phase diagram.
Starting Page	705
Ending Page	712
Page Count	8
File Format	PDF
ISSN	03044289
Journal	Pramana
Volume Number	83
Issue Number	5
e-ISSN	09737111
Language	English
Publisher	Springer India
Publisher Date	2014-10-17
Publisher Place	India
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Quantum chromodynamics phase diagram critical point first-order phase transition heavy-ion collisions quark gluon plasma net-proton Physics Astronomy, Observations and Techniques Astrophysics and Astroparticles
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy

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