Abstract

The data from HERA provide us with excellent information on elastic vector meson production: γp → Vp [1,2]. We have precise measurements of the Q 2, m V and t dependences of the cross section, for different mesons (ϱ, f, J/ψ), as well as information on the transverse and longitudinal components of the cross section. Moreover H1 and ZEUS have found some indications of violation of the s-channel helicity conservation (SCHC). With J.R. Cudell we have studied ways of implementing Fermi motion in elastic vector-meson production, and have proposed a new approach which allows the quarks to be off-shell, and which naturally reproduces all the data [3]. I shall present here a very brief explanation of our model and show its results, including new results obtained on the helicity amplitudes.

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