Power corrections to the process $γ^{*}γ\to ππ$ in the running coupling method

Details Power corrections to the process $γ^{*}γ\to ππ$ in the running coupling method Power corrections to the process $γ^{*}γ\to ππ$ in the running coupling method

2004-03-25

arxiv.org/abs/hep-ph/0403266v2

Eur.Phys.J. C37 (2004) 457-464

Physics

High Energy Physics

High Energy Physics - Phenomenology

15 pages, 5 figures

Scientific paper

10.1140/epjc/s2004-02010-5

Power-suppressed corrections coming from the end-point integration regions in the amplitude of the process $\gamma^{*}\gamma \to \pi \pi$ at large $Q^2$ and small squared center-of-mass energy $W^2$ are calculated in the QCD hard-scattering approach where the amplitudes factorize in a hard perturbatively calculable part and a generalized distribution amplitude. The running coupling method and the technique of infrared renormalon calculus are applied to obtain Borel resummed expressions for the two main components of the process amplitude. Numerical estimates for these power corrections are presented. They are sizeable when $Q^2 < 10 GeV^2$.

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