The impact factor for the virtual photon to light vector meson transition

Details The impact factor for the virtual photon to light vector meson transition The impact factor for the virtual photon to light vector meson transition

2004-05-30

arxiv.org/abs/hep-ph/0405297v2

Eur.Phys.J. C38 (2004) 195-213

Physics

High Energy Physics

High Energy Physics - Phenomenology

31 pages latex; few comments and one reference added; version to appear in Eur. Phys. Journal C

Scientific paper

10.1140/epjc/s2004-02039-4

We evaluate in the next-to-leading approximation the forward impact factor for the virtual photon to light vector meson transition in the case of longitudinal polarization. We find that in the hard kinematic domain, both in the leading and in the next-to-leading approximation, the expression for the impact factor factorizes, up to power suppressed corrections, into the convolution of a perturbatively calculable hard-scattering amplitude and a meson twist-2 distribution amplitude.

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