Can one measure timelike Compton scattering at LHC ?

Details Can one measure timelike Compton scattering at LHC ? Can one measure timelike Compton scattering at LHC ?

2008-11-03

arxiv.org/abs/0811.0321v1

Phys.Rev.D79:014010,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

9 pages, 10 figures

Scientific paper

10.1103/PhysRevD.79.014010

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.

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