26-30 March 2012
University of Bonn
Europe/Berlin timezone

High energy exclusive leptoproduction of the rho-meson: theory and phenomenology

27 Mar 2012, 15:20
Lecture Hall, Institute for Applied Physics (University of Bonn)

Lecture Hall, Institute for Applied Physics

University of Bonn

Diffraction and vector mesons Diffraction and vector mesons


Adrien Besse (L)


Exclusive leptoproduction of vector mesons has been the subject of recent significant progress, both theoretically and experimentally. In particular, the hard regime with a highly virtual photon exchange allows to separate a short distance dominated amplitude of hard subprocess from suitably defined hadronic objects. However, a consistent picture is still missing, in particular for contributions to the scattering amplitude beyond the leading power in the photon virtuality. We recently described the hard production of transversally polarized rho-meson, up to twist 3 accuracy, including 2- and 3- particles Fock-states, in the HERA kinematics of high center-of-mass energy. Furthermore, we here show how saturation effects could be included in our model. This is based on the dipole representation of the scattering amplitude in coordinate space, which we extend up to twist 3, based on our previous studies of the scattering amplitude in momentum space. We compare our model with H1 and ZEUS data for the ratios of helicity amplitudes T(gamma*T -> rhoT )/T(gamma*L -> rhoL) and T(gamma*T -> rhoL)/T(gamma*L -> rhoL) and get a good description of the data.

Primary author


Lech Szymanowski (Soltan Institute for Nuclear Studies) Dr Samuel Wallon (LPT and UPMC)

Presentation Materials