Abstract
We discuss the associated $c\overline{c}$ and ${l}^{+}{l}^{\ensuremath{-}}$ pairs production in ultraperipheral heavy-ion collisions at high energies. Such a channel provides a novel probe for double-parton scattering (DPS) at small $x$ enabling one to probe the photon density inside the nucleus. We have derived an analog of the standard central $pp$ pocket formula and studied the kinematical dependence of the effective cross section. Taking into account both elastic and nonelastic contributions, we have shown predictions for the DPS $c\overline{c}{l}^{+}{l}^{\ensuremath{-}}$ production cross section differential in charm quark rapidity and dilepton invariant mass and rapidity for LHC and a future collider.
Highlights
Particle production processes driven by multiparton interactions in the high energy proton-proton, protonnucleus, or nucleus-nucleus collisions provide an opportunity to probe the inner structure of colliding protons and nuclei
III, we provide an overview of the single parton scattering (SPS) process for dilepton pair production in γγ-fusion in AA ultraperipheral collisions (UPCs) when the projectile nucleus survives intact the collision while the target nucleus can dissociate
We propose a new way to explore a mixed photon-gluon double-parton scattering (DPS) in AA UPCs which differs from more conventional channels corresponding to either pure photon or double-gluon DPS
Summary
Particle production processes driven by multiparton interactions in the high energy proton-proton, protonnucleus, or nucleus-nucleus collisions provide an opportunity to probe the inner structure of colliding protons and nuclei. [13], the same reaction has been employed to explore the double-gluon distribution in the nucleus considering AA UPCs, when the target nucleus was allowed to dissociate In both cases, the resulting cross sections were large enough to have produced a few events at current accelerators, and one hopes that, in the future, controlling for the background and estimating theoretical errors, new information about the correlations involving partons will be available with these observables. Not been studied in the context of double-parton scattering We estimate both the elastic and inelastic contributions to the DPS cross section and conclude that the magnitude of photon-gluon correlation effects is relatively small and does not exceed 10%.
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