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Flavor Symmtry Breaking andd Mixing Effects in the eta-gamma and eta'-gamma Transition Form Factors
Thorsten Feldmann, Peter Kroll
We reanalyze the eta-gamma and eta'-gamma transition form factors within the modified hard scattering approach on the basis of new experimental data from CLEO and L3. Our approach…
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…
Exclusive charmonium decays
Peter Kroll
The role of power corrections and higher Fock-state contributions to exclusive charmonium decays will be discussed. It will be argued that the J/Psi (Psi') decays into baryon-antib…
A perturbative approach to the eta_c-gamma transition form factor
Thorsten Feldmann, Peter Kroll
The eta_c-gamma transition form factor is calculated within a perturbative approach. For the eta_c-meson, a wave function of the Bauer-Stech-Wirbel type is used where the two free…
RX J0719.2+6557: A new eclipsing polar
G. H. Tovmassian, J. Greiner, F. -J. Zickgraf +5
A new magnetic cataclysmic variable is identified as the counterpart of the X-ray source RX J0719.2+6557. The emission lines show radial velocity variations with a period of 98.2 m…