Papers › Improved Monte Carlo Glauber predictions at present and future nuclear colliders
Improved Monte Carlo Glauber predictions at present and future nuclear colliders
Constantin Loizides, Jason Kamin, David d'Enterria
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We present the results of an improved Monte Carlo Glauber (MCG) model of relevance for collisions involving nuclei at center-of-mass energies of BNL RHIC (√(s_(NN))=0.2 TeV), CERN LHC (√(s_(NN))=2.76-$8.8$ TeV), and proposed future hadron colliders (√(s_(NN))≈10-$63$ TeV). The inelastic pp cross sections as a function of √(s_(NN)) are obtained from a precise data-driven parametrization that exploits the many available measurements at LHC collision energies. We describe the nuclear transverse profile with two separated 2-parameter Fermi distributions for protons and neutrons to account for their different densities close to the nuclear periphery. Furthermore, 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 √(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 remain within the previously assigned systematic uncertainties, while their 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 √(s_(NN))=5.44, and AuAu and CuCu at √(s_(NN))=0.2 TeV, are provided.
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