2011/06/15 by X. Luo, Xiaofeng Luo · 49 citations
Physics and Astronomy · #Baryon #Critical point (mathematics) #Hadron #High-Energy Particle Collisions Research #Kurtosis #Lattice QCD #Multiplicity (mathematics) #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Proton #Quantum Chromodynamics and Particle Interactions #Quantum chromodynamics #Quantum mechanics #Rapidity #Sigma #hep-ex #hep-lat #hep-ph #nucl-ex #nucl-th
paper · pdf · doi:10.1088/1742-6596/316/1/012003
published in Journal of Physics Conference Series 316, 012003 (IOP Publishing) · 10 pages, 8 figures, Proceedings of 27th Winter Workshon on Nuclear Dynamics. Feb. 6-13 (2011)
arxiv created 2011/06/15 · openalex publication_date 2011/09/16 · arxiv updated 2011/11/28 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06
Higher moments of event-by-event net-proton multiplicity distributions are applied to search for the QCD critical point in the heavy ion collisions. It has been demonstrated that higher moments as well as moment products are sensitive to the correlation length and directly connected to the thermodynamic susceptibilities computed in the Lattice QCD and Hadron Resonance Gas (HRG) model. In this paper, we will present measurements for kurtosis ( k ), skewness ( S ) and variance ( σ 2 ) of net-proton multiplicity distributions at the mid-rapidity (| y | < 0.5) and 0.4 < p T < 0.8 GeV/ c for Au+Au collisions at = 19.6, 39, 62.4, 130 and 200 GeV, Cu+Cu collisions at = 22.4, 62.4 and 200 GeV, d+Au collisions at = 200 GeV and p+p collisions at = 62.4 and 200 GeV. The moment products k σ 2 and S σ of net-proton distributions, which are related to volume independent baryon number susceptibility ratio, are compared to the Lattice QCD and HRG model calculations. The k σ 2 and S σ of net-proton distributions are consistent with Lattice QCD and HRG model calculations at high energy, which support the thermalization of the colliding system. Deviations of k σ 2 and S σ for the Au+Au collisions at low energies from HRG model calculations are also observed.