The impact factor for the virtual photonto light vector meson transition

theoretical physics

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.

Keywords

Field Theory Elementary Particle Quantum Field Theory Convolution Impact Factor 

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Copyright information

© Springer-Verlag Berlin/Heidelberg 2004

Authors and Affiliations

  1. 1.Sobolev Institute of MathematicsNovosibirskRussia
  2. 2.Budker Institute for Nuclear PhysicsNovosibirskRussia
  3. 3.Novosibirsk State UniversityNovosibirskRussia
  4. 4.Dipartimento di FisicaUniversitá della Calabria and Istituto Nazionale di Fisica Nucleare, Gruppo collegato di Cosenza, Arcavacata di RendeCosenzaItaly

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