Sign of kurtosis near the QCD critical point.
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It is pointed out that the quartic cumulant of the order parameter fluctuations is universally negative when the critical point is approached on the crossover side of the phase separation line and the kurtosis of a fluctuating observable may become smaller than the value given by independent Poisson statistics.Abstract:
We point out that the quartic cumulant (and kurtosis) of the order parameter fluctuations is universally negative when the critical point is approached on the crossover side of the phase separation line. As a consequence, the kurtosis of a fluctuating observable, such as, e.g., proton multiplicity, may become smaller than the value given by independent Poisson statistics. We discuss implications for the beam energy scan program at RHIC at BNL.read more
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Journal ArticleDOI
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