Diffractive vector mesons beyond the s-channel helicity conservation
- 1 November 1998
- journal article
- Published by Pleiades Publishing Ltd in JETP Letters
- Vol. 68 (9) , 696-703
- https://doi.org/10.1134/1.567931
Abstract
We derive a full set, and determine the twist, of helicity amplitudes for diffractive production of light to heavy vector mesons in deep inelastic scattering. For large Q 2 all helicity amplitudes but the double-flip are calculable in perturbative QCD and are proportional to the gluon structure function of the proton at a similar hardness scale. We find a substantial breaking of the s-channel helicity conservation, which must persist in real photoproduction also.Keywords
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