[Jlab-seminars] Theory Center Seminar

[Mary Fox]

Theory Center Seminar
Friday, May 13, 2011
11:00 a.m. (coffee at 10:30 a.m.)
CEBAF Center, Room L104

Peter Kroll
Universitaet Wuppertal


*The 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 ?? 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.

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