https://doi.org/10.1140/epjc/s10052-008-0524-7
Regular Article - Theoretical Physics
Soft end-point and mass corrections to the η′g*g* vertex function
1
Institute for Physical Problems, Baku State University, Z. Khalilov st. 23, 1148, Baku, Azerbaijan
2
Department of Physics, Faculty of Science, Razi University, Kermanshah, Iran
* e-mail: agaev_shahin@yahoo.com
Received:
25
June
2007
Revised:
5
November
2007
Published online:
1
February
2008
Power-suppressed corrections arising from end-point integration regions to the space-like vertex function of the massive η′-meson virtual gluon transition 
are computed. Calculations are performed within the standard hard-scattering approach (HSA) and the running coupling method supplemented by the infrared renormalon calculus. Contributions to the vertex function from the quark and gluon contents of the η′-meson are taken into account and the Borel resummed expressions for 
(Q2,ω,η), as well as for 
(Q2,ω=±1,η) and (Q2,ω=0,η) are obtained. It is demonstrated that the power-suppressed corrections ∼(Λ2/Q2)n, in the explored range of the total gluon virtuality 1≤Q2≤25 GeV2, considerably enhance the vertex function relative to the results found in the framework of the standard HSA with a fixed coupling. Modifications generated by the η′-meson mass effects are discussed.
© Springer-Verlag , 2008
