On hard electroproduction of mesons: helicity flip amplitudes with tensor gluon contributions
arXiv:hep-ph/0107275 · doi:10.1103/PhysRevD.65.054010
Abstract
We consider hard electroproduction of mesons at twist-3 level and focus our attention on helicity flip amplitudes corresponding to the production of transversely polarized mesons by transverse photons. We demonstrate that helicity-flip amplitude for the transversely polarized particles are closely related to the contributions of the matrix elements of the tensor gluon operator which can serve as pure gluonic probe of the hadrons. Using standard factorisation approach and Wanzura-Wilczek approximation for the twist-3 matrix elements we find that such amplitudes do not have divergencies from the endpoint regions which appear in the other twist-3 amplitudes.
17 pages, 7 figures; typos corrected, to appear in Phys. Rev. D
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- Transversity in exclusive vector-meson leptoproduction
- Towards a fitting procedure to deeply virtual meson production -- the next-to-leading order case --
- Generalized Parton Distributions: visions, basics, and realities
- Genuine twist 3 in exclusive electroproduction of transversely polarized vector mesons
- Ratios of Helicity Amplitudes for Exclusive rho-0 Electroproduction
- Diffraction and Vector Mesons Working Group Summary