2019/10/31 by Arghya Chatterjee, A. Chatterjee, Yu Zhang +5 · 1 citation
Engineering · Mathematics · Physics and Astronomy · #Centrality #Charged particle #Collision #Cumulant #High-Energy Particle Collisions Research #Impact parameter #Ion #Mathematics #Multiplicity (mathematics) #Nuclear physics #Nuclear reactor physics and engineering #Particle physics #Physics #Proton #Quantum Chromodynamics and Particle Interactions #Quantum mechanics #Statistics #hep-ph #nucl-ex #nucl-th
paper · pdf · doi:10.1103/physrevc.101.034902
published as Phys. Rev. C 101, 034902 (2020) · 11 pages and 12 figures, Minor update on Fig. 5, 6, 12 and references
openalex created_date 2019/10/25 · openalex publication_date 2020/03/02 · arxiv created 2020/07/17 · arxiv updated 2020/07/20 · openalex updated_date 2026/08/05
We studied the centrality selection effect on cumulants (up to fourth order) and the cumulants' ratios of net-proton multiplicity distributions in Au+Au collisions at √sNN=7.7, 19.6, and 200 GeV from the ultrarelativistic quantum molecular dynamic model. The net-proton cumulants were calculated with collision centralities by using charged-particle multiplicity from different pesudorapidity (\ensuremathη) regions. By comparing the results from various collision centralities, we found that the autocorrelation effects are not significant in the results with the collision centralities ``refmult-3'' and ``refmult-2,'' which use midrapidity charged particles but exclude (anti)protons and the analysis region, respectively. Furthermore, due to the contributions of spectator protons, we observed poor centrality resolution when using charged particles at forward \ensuremathη regions at low energies. This work can serve as a baseline for centrality selection of future fluctuations analysis in relativistic heavy-ion collisions.