Wandzura-Wilczek approximation from generalized rotational invariance - Archive ouverte HAL
Article Dans Une Revue Physics Letters B Année : 2001

Wandzura-Wilczek approximation from generalized rotational invariance

Résumé

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.

Dates et versions

hal-00009493 , version 1 (04-10-2005)

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I. V. Anikin, O. V. Teryaev. Wandzura-Wilczek approximation from generalized rotational invariance. Physics Letters B, 2001, 509, pp.95-105. ⟨hal-00009493⟩
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