110 citations · 485 across the 58 of their papers we have counts for
7 papers · 1 filter
Consistent effective description of nucleonic resonances in an unitary relativistic field-theoretic way
F. Kleefeld
High energy strong interaction physics is successfully described by the local renormalizable gauge theory called Quantum-Chromo-Dynamics (QCD) with quarks and gluons as ``elementar…
Protoninduced Pion-, Eta- and Kaon-Production at Threshold
F. Kleefeld, M. Dillig
We present some details of our recent theoretical investigations on the total cross section of the reactions , and at threshold. Applying s…
Trace evaluation of matrix determinants and inversion of 4 4 matrices in terms of Dirac covariants
Frieder Kleefeld, Manfred Dillig
In the following short paper we list some useful results concerning determinants and inverses of matrices. First we show, how to calculate determinants of matrices, if…
Proton induced production and the content of the proton
Frieder Kleefeld, Fernando Pilotto, Manfred Dillig
We investigate the exclusive proton-induced production near the kaon threshold. Compared are two models: a meson-exchange model, which includes , ρKK^\ast$ exch…
Bethe-Salpeter-Approach to Relativistic Two-Fermion-Systems with a Separable Nonstatic Interaction
Frieder Kleefeld, Manfred Dillig
To study the characteristic features of relativistic bound systems, the Bethe-Salpeter equation (BSE) for two equal mass spin 1/2 particles (like the deuteron) is solved in the cm-…
Consistent effective field-theoretic treatment of resonances with non zero width
F. Kleefeld
A systematic field theoretic formalism for treating Fermionic resonances with non zero width is given. The implication of unitarity to coupling constants of non local interactions…
Reinvestigation of and at threshold
Frieder Kleefeld, Manfred Dillig
and were considered close to threshold. The pion production was found not only to be dominated by impulse approximation (IA) and rescattering contribution…