Probing Transversity in Electroproduction of Two Vector Mesons

Abstract

Electroproduction of two vector mesons with a large rapidity gap between them provides the first feasible selective access to chiral-odd GPDs. The scattering amplitude of the process ${\gamma }^{\ast }N\to {\rho }_L^0{\rho }_T^{+}{N}^{\prime }$ may be represented as a convolution of an impact factor describing the ${\gamma }^{\ast }\to {\rho }_L^0$ transition and an amplitude describing the $N\to {\rho }_T^{+}{N}^{\prime }$ transition, analogously to deeply exclusive electroproduction of a meson, the virtual photon being replaced by a Pomeron. The production of a transversely polarized vector meson ${\rho }_T^{+}$ selects a chiral-odd GPD in the proton.

Comments: 5 pages, 1 eps. figure, presented by at SPIN-03 Workshop, Dubna, September 16-20