Twist-3 contribution to the $γ^*γ\to ππ$ amplitude in the Wandzura-Wilczek approximation

Details Twist-3 contribution to the $γ^*γ\to ππ$ amplitude in the Wandzura-Wilczek approximation Twist-3 contribution to the $γ^*γ\to ππ$ amplitude in the Wandzura-Wilczek approximation

2000-10-16

arxiv.org/abs/hep-ph/0010161v1

Phys.Rev. D63 (2001) 054017

Physics

High Energy Physics

High Energy Physics - Phenomenology

13 pages, 4 figures

Scientific paper

10.1103/PhysRevD.63.054017

We have calculated the Wandzura-Wilczek contribution to the twist-3 part of $\gamma^*\gamma\to 2\pi$ amplitude. It describes interaction of the longitudinally polarized virtual photon with the real one, and it is suppressed by 1/Q, where $Q^2$ is the virtuality of the $\gamma^*$, as compared to the twist-2 contribution. We have found that, in the Wandzura-Wilczek approximation, factorization applies to the twist-3 amplitude.

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