Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2009-11-27
Phys.Rev.D81:054016,2010
Physics
High Energy Physics
High Energy Physics - Phenomenology
45 pages, 33 figures, 4 tables
Scientific paper
10.1103/PhysRevD.81.054016
In this article, we investigate the contribution of the higher-twist Feynman diagrams to the large-$p_T$ inclusive single meson production cross section in photon-photon collisions and present the general formulas for the higher-twist differential cross sections in case of the running coupling and frozen coupling approaches. The structure of infrared renormalon singularities of the higher-twist subprocess cross section and the resummed expression (the Borel sum) for it are found. We compared the resummed higher-twist cross sections with the ones obtained in the framework of the frozen coupling approach and leading-twist cross section. We obtain, that ratio $R=(\Sigma_{M^{+}}^{HT})^{res}$ / $(\Sigma_{M^{+}}^{HT})^{0}$, for all values of the transverse momentum $p_{T}$ of the meson identically equivalent to ratio $r$=($\Delta_{M}^{HT})^{res}$ / $(\Delta_{M}^{HT})^{0}$. It is shown that the resummed result depends on the choice of the meson wave functions used in calculation. Phenomenological effects of the obtained results are discussed.
Ahmadov Azar I.
Aydin Coskun
Dadashov E. A.
Nagiyev Sh. M.
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