[Jlab-seminars] Theory Seminar by Peter Kroll @ 11:00am in L104

[D. W. Higinbotham]

Theory Seminar, Friday, May 13, 11:00 am, room L104

Peter Kroll, Universitaet Wuppertal

Form factors for the photon to pseudoscalar meson transitions in QCD

The form factors for the transitions pi-gamma, eta-gamma, eta'-gamma, 
and eta_c-gamma are analyzed within the modified perturbative 
approach in which quark transverse degrees of freedom are retained. 
The results for the form factors are compared to experiment in detail. 
As compared to previous calculations within the same approach only 
little modifications of the meson distribution amplitudes are 
required in general in order to achieve reasonable agreement with 
experiment. Only for the πγ form factor a strong contribution from 
the second Gegenbauer term is found. It also commented on the case of 
two virtual photons and on the transition form factors in the 
time-like region.