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Measurement of higher cumulants of net-charge multiplicity distributions in Au + Au collisions at $$sqrt{s_{NN}}$$ = 7.7-200 GeV

Adare, A.*; Imai, Kenichi; Nagamiya, Shoji; Sako, Hiroyuki  ; Sato, Susumu ; Tanida, Kiyoshi  ; PHENIX Collaboration*; 506 of others*

We report the measurement of cumulants ($$C_n$$, $$n=1,...,4$$) of the net-charge distributions measured within pseudorapidity ($$|eta| < 0.35$$) in Au + Au collisions at $$sqrt{s_{NN}}$$ = 7.7-200 GeV with the PHENIX experiment at the Relativistic Heavy Ion Collider. The ratios of cumulants (e.g., $$C_1/C_2$$, $$C_3/C_1$$) of the net-charge distributions, which can be related to volume independent susceptibility ratios, are studied as a function of centrality and energy. These quantities are important to understand the quantum-chromodynamics phase diagram and possible existence of a critical end point. The measured values are very well described by expectation from negative binomial distributions. We do not observe any nonmonotonic behavior in the ratios of the cumulants as a function of collision energy. The measured values of $$C_1/C_2$$ and $$C_3/C_1$$ can be directly compared to lattice quantum-chromodynamics calculations and thus allow extraction of both the chemical freeze-out temperature and the baryon chemical potential at each center-of-mass energy. The extracted baryon chemical potentials are in excellent agreement with a thermal-statistical analysis model.

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Category:Physics, Nuclear

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