期刊
PHYSICAL REVIEW C
卷 97, 期 5, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevC.97.054910
关键词
-
资金
- US Department of Energy, Office of Science, Office of Nuclear Physics [DE-FG02-94ER40865, DE-AC05-00OR22725]
We present the results of an improved Monte Carlo Glauber (MCG) model of relevance for collisions involving nuclei at center-of-mass energies of the BNL Relativistic Heavy Ion Collider root S-NN = 0.2 TeV), CERN Large Hadron Collider (LHC) = (root S-NN = 2.76-8.8 TeV), and proposed future hadron colliders (root S-NN approximate to 10-63 TeV). The inelastic pp cross sections as a function of root S-NN are obtained from a precise data-driven parametnzation that exploits the many available measurements at LHC collision energies. We describe the nuclear density of a lead nucleus with two separated two-parameter Fermi distributions for protons and neutrons to account for their different densities close to the nuclear periphery. Lurthermore, we model the nucleon degrees of freedom inside the nucleus through a lattice with a minimum nodal separation, combined with a recentering and reweighting procedure, that overcomes some limitations of previous MCG approaches. The nuclear overlap function, number of participant nucleons and binary nucleon-nucleon collisions, participant eccentricity and triangularity, overlap area, and average path length are presented in intervals of percentile centrality for lead-lead (PbPb) and proton-lead (pPb) collisions at all collision energies. We demonstrate for collisions at root S-NN = 5.02 TeV that the central values of the Glauber quantities change by up to 7% in a few bins of reaction centrality, due to the improvements implemented, though typically they remain within the previously assigned systematic uncertainties, while their new associated uncertainties are generally smaller (mostly below 5%) at all centralities than for earlier calculations. Tables for all quantities versus centrality at present and foreseen collision energies involving Pb nuclei, as well as for collisions of XeXe at root S-NN= 5.44 TeV, and AuAu and CuCu at root S-NN= 0.2 TeV, are provided. The source code for the improved Monte Carlo Glauber model is made publicly available.
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