High energy rho meson leptoproduction

A. Besse (1) , L. Szymanowski (2) , S. Wallon (1, 3)

1 LPT - Laboratoire de Physique Théorique d'Orsay [Orsay]
2 NCBJ - National Center for Nuclear Research [Warsaw]
3 UPMC - Université Pierre et Marie Curie - Paris 6

We investigate the longitudinal and transverse polarized cross-sections of the leptoproduction of the rho meson in the high energy limit. Our model is based on the computation of the impact factor gamma*(lambda_gamma) -> rho(lambda_rho) using the twist expansion in the forward limit and expressed in the impact parameter space. This treatment involves in the final stage the twist 2 and twist 3 distribution amplitudes (DAs) of the rho meson and the dipole scattering amplitude. Taking models that exist for the DAs and for the dipole cross-section, we get a phenomenological model for the helicity amplitudes, we compare our predictions with HERA data and get a fairly good description for large enough virtualities of the photon.

Domaines: Physique des Hautes Energies - Expérience [hep-ex]; Physique des Hautes Energies - Phénoménologie [hep-ph]; Physique Nucléaire Expérimentale [nucl-ex]; Physique Nucléaire Théorique [nucl-th]

A. Besse, L. Szymanowski, S. Wallon. High energy rho meson leptoproduction. 2013. ⟨hal-00874361⟩