Experimental Results on Charge Fluctuations in Heavy-Ion Collisions

被引:5
作者
Mishra, D. K. [1 ]
Garg, P. [2 ]
Netrakanti, P. K. [1 ]
Pant, L. M. [1 ]
Mohanty, A. K. [1 ]
机构
[1] Bhabha Atom Res Ctr, Div Nucl Phys, Mumbai 400085, Maharashtra, India
[2] SUNY Stony Brook, Dept Phys & Astron, Stony Brook, NY 11794 USA
关键词
BY-EVENT FLUCTUATIONS; PARTICLE NUMBER FLUCTUATIONS; FREEZE-OUT CONDITIONS; NET-PROTON; HIGHER MOMENTS; NUCLEAR COLLISIONS; ART; QCD; DYNAMICS; SIGNAL;
D O I
10.1155/2017/1453045
中图分类号
O412 [相对论、场论]; O572.2 [粒子物理学];
学科分类号
摘要
We present a subset of experimental results on charge fluctuation from the heavy-ion collisions to search for phase transition and location of critical point in the QCD phase diagram. Measurements from the heavy-ion experiments at the SPS and RHIC energies observe that total charge fluctuations increase from central to peripheral collisions. The net-charge fluctuations in terms of dynamical fluctuation measure nu((+-),(dyn)) are studied as a function of collision energy (root S-NN) and centrality of the collisions. The product of nu((+-,dyn)) and < N-ch > shows a monotonic decrease with collision energies, which indicates that at LHC energy the fluctuations have their origin in the QGP phase. The fluctuations in terms of higher moments of net-proton, net-electric charge, and net-kaon have been measured for various root S-NN. Deviations are observed in both S sigma and kappa sigma(2) for net-proton multiplicity distributions from the Skellam and hadron resonance gas model for root S-NN < 39GeV. Higher moment results of the net-electric charge and net-kaon do not observe any significant nonmonotonic behavior as a function of collision energy. We also discuss the extraction of the freeze-out parameters using particle ratios and experimentally measured higher moments of net-charge fluctuations. The extracted freeze-out parameters from experimentally measured moments and lattice calculations are found to be in agreement with the results obtained from the fit of particle ratios to the thermal model calculations.
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页数:14
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