Avrasya University

AVRASYA UNIVERSITY

DEPARTMENT of COMPUTER ENGINEERING

Moodle

Ferudun Keskin, Ph.D

Assistant Professor of High Energy Physics

Publications

2012

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 Abstract PDF
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.

2012

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 Abstract PDF
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 holographic QCD.

2011

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 Abstract PDF
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.