Diffractive vector mesons beyond the s-channel helicity conservation

Details Diffractive vector mesons beyond the s-channel helicity conservation Diffractive vector mesons beyond the s-channel helicity conservation

1998-09-25

arxiv.org/abs/hep-ph/9809539v2

JETP Lett. 68 (1998) 696-703; Pisma Zh.Eksp.Teor.Fiz. 68 (1998) 667-673

Physics

High Energy Physics

High Energy Physics - Phenomenology

7 pages, 1 postscript figure. Discussion of double-flip updated, typos corrected, reference to the ZEUS, H1, HERMES presentati

Scientific paper

10.1134/1.567931

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 hard scale. We find a substantial breaking of the $s$-channel helicity conservation which must persist also in real photoproduction.

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