The η (η′) gamma transition form factor and the gluon–gluon distribution amplitude (CROSBI ID 201407)
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Podaci o odgovornosti
Kroll, Peter ; Passek-Kumerički, Kornelija
engleski
The η (η′) gamma transition form factor and the gluon–gluon distribution amplitude
The ηγ and η′γ transition form factors are analyzed to leading-twist accuracy and next-to- leading order of perturbative QCD. Using an η–η′ mixing scheme and all currently available experimental data the lowest Gegenbauer coefficients of the distribution amplitudes for the valence octet and singlet and the gluon–gluon Fock components are extracted. Predictions for the g*g*η′ vertex function are presented. We also comment on the new BELLE results for the πγ transition form factor.
perturbative QCD; eta meson; eta' meson; two-gluon Fock state; transition form factor
[arXiv:1206.4870]
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Podaci o izdanju
40
2013.
075005-1-075005-17
objavljeno
0954-3899
10.1088/0954-3899/40/7/075005