Timelike Compton Scattering off the nucleon: polarization observables and experimental perspectives for JLab-12 GeV

29 Apr 2015, 08:55


WG1 Structure Functions and Parton Densities WG1 Structure Functions and Parton Densities


Dr Marie Boër (Institut de Physique Nucléaire d'Orsay)


Hard exclusive processes on the nucleon have been the subject of intense studies for the past 15 years. In the regime where the scattering amplitude is factorized into a hard and a soft part, such reactions provide access to Generalized Parton Distributions (GPDs). These quantities contain informations about the longitudinal momentum and the transverse spatial distributions of quarks and gluons. In this presentation, we will discuss our recent work on Timelike Compton Scattering (TCS), which corresponds to the reaction γN->γ*N->e+e-N and where the photon is scattered off a quark. This reaction also involves the Bethe-Heitler process, where the final state e+e- pair comes from the the initial photon. We derived the amplitudes of these processes and we calculated, at typical JLab-12 GeV energies, all the single and double beam and/or target polarization observables off the proton and off the neutron. We also studied the experimental feasability of such measurements at JLab. Reference : M.Boër, M.Guidal and M.Vanderhaeghen, Single and double polarization observables in timelike Compton scattering off proton, arXiv:1501.00270 [hep-ph].

Primary author

Dr Marie Boër (Institut de Physique Nucléaire d'Orsay)

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