644 citations · 4.2k across the 124 of their papers we have counts for
5 papers · 1 filter
Four new active galaxies with steep soft X-ray spectra
J. Greiner, R. Danner, N. Bade +3
We have discovered four AGN in the ROSAT all-sky-survey data with very steep X-ray spectra. We apply several models to these X-ray spectra with emphasis on warm absorber models whi…
Spin effects in hard exclusive reactions
P. Kroll
The present status of applications of perturbative QCD to large momentum transfer exclusive reactions is discussed. It is argued that in the region of momentum transfer accessible…
Virtual Compton Scattering Off Protons at Moderately Large Momentum Transfer
P. Kroll, M. Schürmann, P. A. M. Guichon
The amplitudes for virtual Compton scattering off protons are calculated within the framework of the diquark model in which protons are viewed as being built up by quarks and diqua…
THE LARGE MOMENTUM TRANSFER BEHAVIOUR OF MESON-PHOTON TRANSITION FORM FACTORS
P. Kroll
It is reported on predictions for the - transition form factor obtained within a perturbative approach which includes transverse momentum effects and Sudakov corrections. The…
A perturbative approach to decays into two mesons
M. Dahm, R. Jakob, P. Kroll
The modified perturbative approach in which transverse degrees of freedom as well as Sudakov suppressions are taken into account, is applied to decays into two mesons. The…