Measurement of higher cumulants of net-charge multiplicity distributions in Au + Au collisions at sNN =7.7-200 GeV
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 sNN=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.
Adare, A; Afanasiev, S; Aidala, C; Ajitanand, NN; Akiba, Y; Akimoto, R; Al-Bataineh, H; Alexander, J; Al-Ta'Ani, H; Angerami, A; Aoki, K; Apadula, N; Aramaki, Y; Asano, H; Aschenauer, EC; Atomssa, ET; Averbeck, R; Awes, TC; Azmoun, B; Babintsev, V; Bai, M; Baksay, G; Baksay, L; Bannier, B; Barish, KN; Bassalleck, B; Basye, AT; Bathe, S; Baublis, V; Baumann, C; Baumgart, S; Bazilevsky, A; Belikov, S; Belmont, R; Bennett, R; Berdnikov, A; Berdnikov, Y; Bickley, AA; Black, D; Blau, DS; Bok, JS; Boyle, K; Brooks, ML; Bryslawskyj, J; Buesching, H; Bumazhnov, V; Bunce, G; Butsyk, S; Camacho, CM; Campbell, S; Castera, P; Chen, CH; Chi, CY; Chiu, M; Choi, IJ; Choi, JB; Choi, S; Choudhury, RK; Christiansen, P; Chujo, T; Chung, P; Chvala, O; Cianciolo, V; Citron, Z; Cole, BA; Connors, M; Constantin, P; Cronin, N; Crossette, N; Csanád, M; Csörgo, T; Dahms, T; Dairaku, S; Danchev, I; Das, K; Datta, A; Daugherity, MS; David, G; Dehmelt, K; Denisov, A; Deshpande, A; Desmond, EJ; Dharmawardane, KV; Dietzsch, O; Ding, L; Dion, A; Do, JH; Donadelli, M; D'Orazio, L; Drapier, O; Drees, A; Drees, KA; Durham, JM; Durum, A; Dutta, D; Edwards, S; Efremenko, YV; Ellinghaus, F; Engelmore, T; Enokizono, A
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