The forward impact factor for the virtual photon to light vector meson transition is evaluated in the next-to- leading approximation. It is shown that in the hard kinematic domain, both in the leading and in the next-to- leading approximation, 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.
The virtual photon to light vector meson impact factor in the next-to-leading order
PAPA, Alessandro
2005-01-01
Abstract
The forward impact factor for the virtual photon to light vector meson transition is evaluated in the next-to- leading approximation. It is shown that in the hard kinematic domain, both in the leading and in the next-to- leading approximation, 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.File in questo prodotto:
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