Wandzura-Wilczek approximation from generalized rotational invariance

Anikin, I.V.; Teryaev, O.V.

doi:10.1016/S0370-2693(01)00555-X

Wandzura-Wilczek approximation from generalized rotational invariance

I.V. Anikin
(
- Regensburg U. and
- Valencia U.
)
,
O.V. Teryaev
(
- Regensburg U. and
- Dubna, JINR
)

Feb, 2001

14 pages

Published in:

Phys.Lett.B 509 (2001) 95-105

e-Print:

hep-ph/0102209 [hep-ph]

DOI:

10.1016/S0370-2693(01)00555-X

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

\gamma^{\star}\pi\to \gamma\pi

and

\gamma^{\star}\gamma\to\pi\pi

. 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

\gamma^{\star}\gamma\to\pi\pi

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

References(15)

Figures(0)

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