Volume 345 - International Conference on Hard and Electromagnetic Probes of High-Energy Nuclear Collisions (HardProbes2018) - Heavy Flavours & Quarkonia
Charm, bottom, and quarkonia cross sections for double and triple-parton scatterings in high-energy proton-nucleus and nucleus-nucleus collisions
A. Snigirev,* D. d'Enterria
*corresponding author
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Pre-published on: 2019 January 11
Published on:
Abstract
The framework to compute the cross sections for the production
of particles with high mass and/or large transverse momentum in double-
(DPS), triple- (TPS), and in general n-parton scatterings from the
corresponding single-parton ($\sigma_{\rm SPS}$) values in high-energy proton and nuclear collisions is reviewed. The basic parameter of the factorized n-parton scattering
ansatz is an effective cross section $\sigma_{\rm eff}$ encoding all unknowns about the
underlying generalized n-parton distribution in the proton (nucleon). In
its simplest and most economical form, the $\sigma_{\rm eff}$ parameter can be derived
from the transverse parton profile of the colliding protons and/or
nucleus, using a Glauber approach. Numerical examples for the cross sections and
yields expected for the concurrent DPS or TPS production of heavy-quarks,
quarkonia, and/or gauge bosons in proton and nuclear collisions at LHC
and Future Circular Collider (FCC) energies are provided. The obtained
cross sections are based on perturbative QCD predictions for $\sigma_{\rm SPS}$ at
next-to-leading-order (NLO) or next-to-NLO (NNLO) accuracy including,
when needed, nuclear modifications of the corresponding parton densities.
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