Wandzura-Wilczek approximation from generalized rotational invariance
Feb, 200114 pages
Published in:
- Phys.Lett.B 509 (2001) 95-105
e-Print:
- hep-ph/0102209 [hep-ph]
Report number:
- FTUV-01-0216,
- IFIC-01-05,
- TPR-01-01,
- VALENCIA-U.,-IFIC
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Abstract:
We present the alternative way of derivation of the Wandzura-Wilczek relations between the kinematical twist-3 and twist-2 functions, parameterizing hadronic matrix element in two-photon processes and . The new equations, providing the independence of the physical cross-sections on the choice of the light-cone direction, are suggested and explored. The amplitude of up to genuine twist-3 accuracy is found.Note:
- 14 pages, Latex Report-no: FTUV-01-0216, IFIC/01-05, TPR-01-01
- photon pi: Compton scattering
- off-shell
- photon photon: exclusive reaction
- pi: pair production
- quantum chromodynamics
- effect: higher-twist
- Wandzura-Wilczek approximation
- invariance: rotation
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