Polarization in diffractive electroproduction of light vector mesons
Jul, 199823 pages
Published in:
- Phys.Rev.D 58 (1998) 114026
e-Print:
- hep-ph/9807324 [hep-ph]
Report number:
- NTZ-20-98
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Abstract:
We study in perturbative QCD the helicity ampltiudes of the process at large virtualities of the photon . 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.- electron p: deep inelastic scattering
- photon p: exclusive reaction
- photon: off-shell
- diffraction
- vector meson: electroproduction
- vector meson: photoproduction
- rho(770)0
- helicity: scattering amplitude
- quantum chromodynamics: perturbation theory
- photon: transverse
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