Polarization in diffractive electroproduction of light vector mesons
Abstract
We study in perturbative QCD the helicity ampltiudes of the process γ* p p at large virtualities Q of the photon γ*. We estimate all spin flip amplitudes taking into account an important effect of the scale behaviour of the gluon density. The transition of a transverse virtual photon to a longitudinal vector meson is not small at typical HERA conditions. This helicity non-conserving amplitude leads by interference to a measurable effect in the distribution of the angle between the electron scattering and the meson production planes.
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