A.I. Ahmadov, C. Aydin, and F. Keskin1 Pion wave functions from holographic QCD and the role of infrared renormalons in photon-photon collisions. PHYSICAL REVIEW, D 85 2012 pp. 034009-1-034009-9
In this article, we calculate the contribution of the higher-twist Feynman diagrams to the large-pT 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 the frozen coupling approach a higher-twist contribution to the photon-photon collisions cross section is normalized in terms of the pion electromagnetic form factor.
A.I. Ahmadov, C. Aydin, F. Keskin Mezon wave function from holographic QCD and the role of infrared renormalons in photon-photon collisions.. Annals of Physics, 327 2012 pp. 1472-1483
We calculate the contribution of the higher twist Feynman diagrams to the large-pT inclusive pion
production cross section in proton-proton collisions in the case of the running and frozen coupling
approaches within holographic QCD. The structure of infrared renormalon singularities of the
higher twist subprocess cross section and it’s resummed expression are found. We compare the
resummed higher twist cross sections with the ones obtained in the framework of the frozen coupling
approximation and leading twist cross section. We discuss the phenomenological consequences
of possible higher-twist contributions to the pion production in proton-proton collisions within
Aydın, C., Aydın S.H., Keskin F., Yılmaz A.H., Coupling constant in light cone QCD. PHYSICAL REVIEW, D 84 2011 pp. 096010-1-096010-7
We recalculated the coupling constants g(phi-sigma-gamma), g(phi-a0-gamma), g!, ga0!, g, and ga0 by taking into account the contributions of the three-particle up to twist-4 distribution amplitudes of the photon involving quark-gluon and quark-anti-quark-photon ﬁelds in the light-cone sum-rule framework.