Can one measure timelike Compton scattering at LHC ?

Abstract

Exclusive photoproduction of dileptons, gamma N->e+e-N, is and will be measured in ultraperipheral collisions at hadron colliders, such as the Tevatron, RHIC and the LHC . We demonstrate that the timelike deeply virtual Compton scattering (TCS) mechanism gamma q -> e+e- q where the lepton pair comes from the subprocess gamma q -> gamma* q dominates in some accessible kinematical regions, thus opening a new way to study generalized parton distributions (GPD) in the nucleon. High energy kinematics enables to probe parton distributions at small skewedness. This subprocess interferes at the amplitude level with the pure QED subprocess gamma gamma* -> e+e- where the virtual photon is radiated from the nucleon.

9 pages, 10 figures

References in corpus (7)

• The Physics of Ultraperipheral Collisions at the LHC
• Dynamical parton distributions of the nucleon and very small-x physics
• Towards a fitting procedure for deeply virtual Compton scattering at next-to-leading order and beyond
• On the A-dependence of nuclear generalized parton distributions
• Hard Pomeron-Odderon interference effects in the production of pi^+pi^- pairs in high energy gamma-gamma collisions at the LHC
• Neutron contribution to nuclear DVCS asymmetries
• Exclusive photoproduction of lepton pairs at LHC

Cited by in corpus (3)

• Probing the nucleon's transversity and the photon's distribution amplitude in lepton pair photoproduction
• Leading twist nuclear shadowing, nuclear generalized parton distributions and nuclear DVCS at small x
• Exclusive photoproduction of dileptons at high energies