Abstract
We discuss the associated cbar{c} and bbar{b} quark pairs production in the double-parton scattering (DPS) process in ultraperipheral (UPCs) AA collisions. We derive an analogue of the inclusive DPS pocket formula and the photon-energy dependent effective cross section considering an overlap between the hard SPS scatterings. We provide numerical predictions for the DPS cross sections for the cbar{c}bbar{b} production process at the typical energies of AA UPCs at the LHC and FCC colliders and also characterize the A dependence of the total UPC DPS cross section.
Highlights
The double- or, generally, multi-parton interaction (MPI) processes become increasingly important in hadron-hadron and especially nucleus-nucleus collisions at high energies
While the first-principle calculations of double-parton distribution functions (dPDFs) with non-perturbative parton correlations are yet not feasible theoretically, several models attempting to capture the most relevant dPDFs properties are being advised in the literature, see e.g. Refs. [8,9,16,17,18]
We extend our previous study [30] to heavy-ion A A ultraperipheral collisions (UPCs) with the focus of probing the gluon dPDFs in the A+ A → A+(ccbb)+X reaction by means of double-photon exchange with another nucleus at large impact parameters
Summary
The double- or, generally, multi-parton interaction (MPI) processes become increasingly important in hadron-hadron and especially nucleus-nucleus collisions at high energies. We consider the same type of process as an efficient probe for the double-gluon density in the target nucleus at small-x and compute the corresponding DPS contribution to the observables at different energies. For this purpose, we extend our previous study [30] to heavy-ion A A UPCs with the focus of probing the gluon dPDFs in the A+ A → A+(ccbb)+X reaction by means of double-photon exchange with another nucleus at large impact parameters.
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