Naslov
Measurement of higher cumulants of net-charge multiplicity distributions in Au+Au collisions at sqrt(s_NN)=7.7−200 GeV

Autori
Adare, A. ; ... ; Makek, Mihael ; ... ; Zolin, L.

Izvornik
Physical review C (2469-9985) 93 (2016), 1; 011901-1

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
QCD; cummulants; Au+Au; PHENIX

Sažetak
We report the measurement of cumulants (Cn, n=1, ..., 4) of the net-charge distributions measured within pseudorapidity (|η|<0.35) in Au+Au collisions at sqrt(s_NN)=7.7–200GeV with the PHENIX experiment at the Relativistic Heavy Ion Collider. The ratios of cumulants (e.g., C1/C2, C3/C1) 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 C1/C2 and C3/C1 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.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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