The impact factor for the virtual photonto light vector meson transition |
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| Authors: | Email author" target="_blank">D?Yu?IvanovEmail author M?I?Kotsky A?Papa |
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| Institution: | (1) Sobolev Institute of Mathematics, 630090 Novosibirsk, Russia;(2) Budker Institute for Nuclear Physics, 630090 Novosibirsk, Russia;(3) Novosibirsk State University, 630090 Novosibirsk, Russia;(4) Dipartimento di Fisica, Universitá della Calabria and Istituto Nazionale di Fisica Nucleare, Gruppo collegato di Cosenza, Arcavacata di Rende, 87036 Cosenza, Italy |
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| Abstract: | 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.Received: 20 May 2004, Revised: 28 September 2004, Published online: 15 November 2004 |
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