Transversity in exclusive vector-meson leptoproduction

The European Physical Journal C

S. V. Goloskokov¹  P. Kroll² 

[1] Bogoliubov Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, Dubna, 141980, Moscow region, Russia;Fachbereich Physik, Universität Wuppertal, 42097 , Wuppertal, Germany;Institut für Theoretische Physik, Universität Regensburg, 93040 , Regensburg, Germany;

关键词: Vector Meson;    Interference Term;    Pseudoscalar Meson;    Valence Quark;    Sudakov Factor;   

DOI  :  10.1140/epjc/s10052-014-2725-6

来源: Springer

【 摘 要 】

The role of transversity or helicity-flip generalized parton distributions (GPDs) in leptoproduction of vector mesons is investigated within the framework of the handbag approach. The transversity GPDs in combination with twist-3 meson wave functions occur in the amplitudes for transitions from a transversely polarized virtual photon to a longitudinal polarized vector meson. The importance of the transversity GPDs can be examined in some of the spin density matrix elements and in transverse target spin asymmetries. Using suitable parametrizations of both helicity-flip and -non-flip GPDs, which are essentially taken from our previous papers, we estimate these observables and compare the results with available data.

【 授权许可】

CC BY