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The two-gluon components of the eta and eta' mesons to leading-twist accuracy (CROSBI ID 94806)

Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija

Kroll, Peter ; Passek-Kumerički, Kornelija The two-gluon components of the eta and eta' mesons to leading-twist accuracy // Physical review. D, Particles and fields, 67 (2003), 5; 054017-1-054017-20. doi: 10.1103/PhysRevD.67.054017

Podaci o odgovornosti

Kroll, Peter ; Passek-Kumerički, Kornelija

engleski

The two-gluon components of the eta and eta' mesons to leading-twist accuracy

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.

perturbative QCD; eta meson; eta' meson; two-gluon Fock state

[arXiv:hep-ph/0210045]

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Podaci o izdanju

67 (5)

2003.

054017-1-054017-20

objavljeno

0556-2821

10.1103/PhysRevD.67.054017

Povezanost rada

Fizika

Poveznice