On hard electroproduction of mesons: helicity flip amplitudes with tensor gluon contributions

Details On hard electroproduction of mesons: helicity flip amplitudes with tensor gluon contributions On hard electroproduction of mesons: helicity flip amplitudes with tensor gluon contributions

2001-07-26

arxiv.org/abs/hep-ph/0107275v2

Phys.Rev. D65 (2002) 054010

Physics

High Energy Physics

High Energy Physics - Phenomenology

17 pages, 7 figures; typos corrected, to appear in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.65.054010

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.

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