1202.2632 (A. I. Ahmadov et al.)

Pion wave functions from holographic QCD and the role of infrared
renormalons in photon-photon collisions    [PDF]

A. I. Ahmadov, C. Aydin, F. Keskin

In this article, we calculate the contribution of the higher-twist Feynman
diagrams to the large-$p_T$ inclusive single pion production cross section in
photon-photon collisions in case of the running coupling and frozen coupling
approaches within holographic QCD. We compare the resummed higher-twist cross
sections with the ones obtained in the framework of the frozen coupling
approach and leading-twist cross section. Also, we show that in the context of
frozen coupling approach a higher-twist contribution to the photon-photon
collisions cross section is normalized in terms of the pion electromagnetic
form factor.

View original: http://arxiv.org/abs/1202.2632