DPS mechanism for associated cc l+l- production in AA UPCs as a probe for photon density inside the nucleus
Abstract
We discuss the associated cc and l+l- 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 non-elastic contributions, we have shown predictions for the DPS c c l+l- production cross section differential in charm quark rapidity and dilepton invariant mass and rapidity for LHC and a future collider.
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