12 papers · 1 filter
The photon-pion transition form factor for virtual photons
M. Diehl, P. Kroll, C. Vogt
We discuss the photon to meson transition form factor for virtual photons, which can be measured in e+ e- collisions. We demonstrate that this form factor is independent of the sha…
Skewed parton distributions and wide-angle exclusive scattering
P. Kroll
The overlap representation of skewed parton distributions is discussed and applications to wide-angle Compton scattering and electroproduction of mesons are presented. The amplitud…
Skewed parton distributions and real and virtual Compton scattering
Peter Kroll
The soft physics approach to Compton scattering at moderately large momentum transfer is reviewed. It will be argued that in that approach the Compton cross section as well as othe…
Comment on the paper: ``The perturbative proton form factor reexamined'' by Kundu et al
J. Bolz, R. Jakob, P. Kroll +1
We point out some serious problems in the investigation of Kundu et al. which claims agreement with the existing data of the proton form factor, calculated without taking into acco…
Colour Octet Contribution in Exclusive Charmonium Decay into Baryon-Antibaryon
P. Kroll, S. M. H. Wong
It is argued that colour octet contribution in exclusive charmonium decays is very important even though the same infrared divergence found in P-wave colour singlet inclusive decay…
Electromagnetic processes and the diquark model
Peter Kroll
The present status of the diquark model for exclusive reactions at moderately large momentum transfer is reviewed. That model is a variant of the Brodsky-Lepage approach in which d…