Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1998-07-10
Phys.Rev. D58 (1998) 114026
Physics
High Energy Physics
High Energy Physics - Phenomenology
23 pages LATEX, 2 EPS figures included
Scientific paper
10.1103/PhysRevD.58.114026
We study in perturbative QCD the helicity ampltiudes of the process $\gamma^{*} p \to \rho p $ at large virtualities $Q$ of the photon $\gamma^{*}$. 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.
Ivanov Dmitri Yu.
Kirschner Roland
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