High Energy exclusive Leptoproduction of the $\rho$-meson: Theory and Phenomenology

Anikin, I. V.; Szymanowski, L.; Pire, B.; Wallon, S.; Besse, A.; Ivanov, D. Yu.

doi:10.3204/DESY-PROC-2012-02/63

Contribution to a conference proceedings/Internal Report

PUBDB-2016-00823

High Energy exclusive Leptoproduction of the $\rho$-meson: Theory and Phenomenology

Anikin, I. V. ; Besse, A. ; Ivanov, D. Y. ; Pire, B. ; Szymanowski, L. ; Wallon, S.

2012
Deutsches Elektronen-Synchrotron, DESY Hamburg

20th International Workshop on Deep-Inelastic Scattering and Related Subjects, DIS 2012, Bonn, Germany, 26 Mar 2012 - 30 Mar 2012 Hamburg : Deutsches Elektronen-Synchrotron, DESY 497-500 (2012) [10.3204/DESY-PROC-2012-02/63]

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Report No.: CPHT-PC029-0612; LPT-12-55; arXiv:1206.3402

Abstract: We describe the hard leptoproduction 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. We first build a model based on a simple approach to the unintegrated gluon density (the parton impact factor) that we compare 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. We also show how saturation effects can be included in this model by extending the dipole representation of the scattering amplitude in coordinate space up to twist 3.

Keyword(s): twist: 3 ; rho(770): leptoproduction ; energy: high ; gluon: density ; helicity: amplitude analysis ; deep inelastic scattering ; saturation ; ZEUS ; H1