Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2010-11-03
J.Phys.Conf.Ser.295:012047,2011
Physics
High Energy Physics
High Energy Physics - Phenomenology
6 pages, Proceedings of Spin 2010, 19th International Spin Physics Symposium September 27 - October 2, 2010, J\"ulich, Germany
Scientific paper
10.1088/1742-6596/295/1/012047
We first describe a new way to access the chiral odd transversity parton distribution in the proton through the photoproduction of lepton pairs. The basic ingredient is the interference of the usual Bethe-Heitler or Drell-Yan amplitudes with the amplitude of a process, where the photon couples to quarks through its chiral-odd distribution amplitude, which is normalized to the magnetic susceptibility of the QCD vacuum. We also show how the chiral-odd transversity generalized parton distributions (GPDs) of the nucleon can be accessed experimentally through the exclusive electro - or photoproduction process of a meson pair with a large invariant mass and when the final nucleon has a small transverse momentum. We calculate perturbatively the scattering amplitude at leading order, both in the high energy domain which may be accessed in electron-ion colliders and in the medium energy range. Estimated rates are encouraging.
Beiyad M. El
Pire Bernard
Szymanowski Lech
Wallon Samuel
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