Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2002-10-02
Phys.Rev.D67:054017,2003
Physics
High Energy Physics
High Energy Physics - Phenomenology
20 pages(revtex4 two-column format), 14 figures; a typo corrected; version published in Phys. Rev. D
Scientific paper
10.1103/PhysRevD.67.054017
We critically reexamine the formalism for treating the leading-twist contributions from the two-gluon Fock components occurring in hard processes that involve eta and eta' mesons and establish a consistent set of conventions for the definition of the gluon distribution amplitudes, the anomalous dimensions as well as the projector of a two-gluon state onto an eta or eta' state. We calculate the eta, eta'--photon transition form factor to order alpha_s and show the cancellation of the collinear and UV singularities explicitly. An estimate of the lowest Gegenbauer coefficients of the gluon and quark distribution amplitudes is obtained from a fit to the eta, eta'--photon transition form factor data. In order to elucidate the role of the two-gluon Fock component further, we analyze electroproduction of eta, eta' mesons and the g*g* eta (eta') vertex.
Kroll Peter
Passek-Kumericki Kornelija
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