https://doi.org/10.1140/epjc/s10052-017-4661-8
Regular Article - Theoretical Physics
A study of the 
–
transition form factors
1
Fachbereich Physik, Universität Wuppertal, 42097, Wuppertal, Germany
2
Institut für Theoretische Physik, Universität Regensburg, 93040, Regensburg, Germany
* e-mail: kroll@physik.uni-wuppertal.de
Received:
12
October
2016
Accepted:
30
January
2017
Published online:
13
February
2017
The – transition form factors are calculated within the QCD factorization framework. The 
-meson is assumed to be mainly generated through its 
Fock component. The corresponding spin wave function of the meson is constructed and, combined with a model light-cone wave function for this Fock component, used in the calculation of the form factors. In the real-photon limit the results for the transverse form factor are compared to the large momentum-transfer data measured by the BELLE collaboration recently. It turns out that, for the momentum-transfer range explored by BELLE, the collinear approximation does not suffice, power corrections to it, modeled as quark transverse moment effects, seem to be needed. Mixing of the with the 
is also briefly discussed.
© The Author(s), 2017
