Eur. Phys. J. C (1998) 1: 321-331
https://doi.org/10.1007/BF01245821

Single meson photoproduction and IR renormalons

International Centre for Theoretical Physics, I-34014, Trieste, Italy

^* e-mail: azhep@lan.ab.az

Received: 18 November 1996
Revised: 18 April 1997
Published online: 27 February 2005

Abstract

Single pseudoscalar and vector mesons hard semi-inclusive photoproductionγh → MX via higher twist mechanism is calculated using the QCD running coupling constant method. It is proved that in the context of this method a higher twist contribution to the photoproduction cross section cannot be normalized in terms of the meson electromagnetic form factor. The structure of infrared renormalon singularities of the higher twist subprocess cross section and the resummed expression (the Borel sum) for it are found. Comparisons are made with earlier results, as well as with leading twist cross section. Phenomenological effects of studied contributions for π,K,ϱ-meson photoproduction are discussed.