Power corrections to the process $\gamma^{*}\gamma \to \pi\pi$ in the running coupling method - Archive ouverte HAL
Article Dans Une Revue European Physical Journal C: Particles and Fields Année : 2004

Power corrections to the process $\gamma^{*}\gamma \to \pi\pi$ in the running coupling method

M. Guidal
  • Fonction : Auteur

Résumé

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 $Q^2 < 10 GeV^2$.

Dates et versions

hal-00008736 , version 1 (14-09-2005)

Identifiants

Citer

S. S. Agaev, M. Guidal, B. Pire. Power corrections to the process $\gamma^{*}\gamma \to \pi\pi$ in the running coupling method. European Physical Journal C: Particles and Fields, 2004, 34, pp.457-464. ⟨hal-00008736⟩
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