Speaker
Description
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_SPS) values in high-energy proton and nucleus will be
reviewed. The basic parameter of the factorized n-parton scattering ansatz
is an effective cross section sigma_eff encoding all unknowns about the
underlying generalized n-parton distribution in the proton (nucleon). In its
simplest and most economical form, the sigma_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 will be provided. The obtained cross
sections are based on perturbative QCD predictions for sigma_SPS at
next-to-leading-order (NLO) or next-to-NLO (NNLO) accuracy including, when
needed, nuclear modifications of the corresponding parton densities.
