110 citations · 485 across the 58 of their papers we have counts for
8 papers · 1 filter
On a new unitarization scheme inspired by Dalitz and Tuan applied to meson-meson and meson-baryon scattering
F. Kleefeld
A new crossing symmetric unitarization scheme conveniently applied to meson-meson and meson-baryon scattering amplitudes is shortly proposed which can be not only used by theoretic…
On Scalar Meson Dominance in Semi- and Non-Leptonic Weak Pseudoscalar Meson Decays
F. Kleefeld
Aspects of Scalar Meson Dominance in semi- and non-leptonic weak pseudoscalar meson decays are shortly discussed on the basis of the Quark-Level Linear Sigma Model.
Complex Meson Spectroscopy
Eef van Beveren, Frieder Kleefeld, George Rupp
We do meson spectroscopy by studying the behavior of S-matrix poles in the complex-energy plane, as a function of the coupling strength for triplet-P-zero quark-pair creation. Ther…
Coulomb-scattering and eta - eta-prime mixing angle
F. Kleefeld
The fascinating physics underlying eta and eta-prime mesons can be studied theoretically and experimentally in various contexts. In this presentation we want to turn our attention…
From the Kappa via the Ds0*(2317) to the chi_c0: connecting light and heavy scalar mesons
Eef van Beveren, Joao E. G. N. Costa, Frieder Kleefeld +1
Pole trajectories connecting light and heavy scalar mesons, both broad resonances and quasi-bound states, are computed employing a simple coupled-channel model. Instead of varying…
On (non-Hermitian) Lagrangeans in (particle) physics and their dynamical generation
F. Kleefeld
On the basis of a new method to derive the effective action the nonperturbative concept of "dynamical generation" is explained. A non-trivial, non-Hermitian and PT-symmetric soluti…
Kurt Symanzik - a stable fixed point beyond triviality
F. Kleefeld
In 1970 Kurt Symanzik proposed a "precarious" phi**4-theory with a negative quartic coupling constant as a valid candidate for an asymptotically free theory of strong interactions.…
Images in Christmas Balls
Eef van Beveren, Frieder Kleefeld, George Rupp
We describe light-reflection properties of spherically curved mirrors, like balls in the Christmas tree. In particular, we study the position of the image which is formed somewhere…