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Probing chiral-odd GPD's in diffractive electroproduction of two vector mesons

D. Yu. Ivanov·B. Pire·L. Szymanowski·O. V. Teryaev
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Abstract

We consider the electroproduction of two vector mesons with a large rapidity gap between them on a nucleon target in the process $ γ^* N \to ρ_1 ρ_2 N'$. We calculate the Born term for this process within the collinear factorization framework. The resulting scattering amplitude may be represented as a convolution of an impact factor describing the $γ^* \to ρ_1$ transition and an amplitude describing the $N\to ρ_2 N'$ transition. The latter amplitude is analogous to deeply virtual electroproduction of a meson, the virtual photon being replaced by two gluon (Pomeron) exchange . The long distance part of this amplitude is described by Generalized Parton Distributions (GPD) and meson light-cone distributions. The selection of a transversely polarized vector meson $ρ_2$ provides the first feasible selective access to chiral-odd GPD.

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D. Yu. Ivanov, B. Pire, L. Szymanowski, O. V. Teryaev. 2002-11-13. Probing chiral-odd GPD's in diffractive electroproduction of two vector mesons. https://doi.org/10.1016/s0370-2693(02)02856-3

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