Transversity Distribution Does Not Contribute to Hard Exclusive Electroproduction of Mesons

Details Transversity Distribution Does Not Contribute to Hard Exclusive Electroproduction of Mesons Transversity Distribution Does Not Contribute to Hard Exclusive Electroproduction of Mesons

1999-07-26

arxiv.org/abs/hep-ph/9907498v1

Phys.Rev. D61 (2000) 114015

Physics

High Energy Physics

High Energy Physics - Phenomenology

5 pages, 3 figures, ReVTeX

Scientific paper

10.1103/PhysRevD.61.114015

We show that in hard exclusive electroproduction, ep-->eVp, the leading-twist hard-scattering coefficient for the production of a transversely polarized vector meson V vanishes to all orders of perturbation theory. This implies that this process cannot be used to measure the skewed transversity distribution of quarks in a hadron. In contrast, a recent calculation obtained a non-zero value at NLO. We show that this calculation is incorrect because it failed to include the necessary collinear subtractions. Our method of proof also applies to other processes whose hard-scattering coefficients are constrained by chirality and helicity conservation, and thus validates helicity selection rules based on these symmetries.

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