Frieder Kleefeld

The nature of σ, κ, a0(980) and f0(980)

Masses and widths of the four light scalar mesons

Remarks on the f_0(400-1200) scalar meson as the dynamically generated chiral partner of the pion

\sigma

Identifying the quark content of the isoscalar scalar mesons f(0)(980), f(0)(1370), and f(0)(1500) from weak and electromagnetic processes

,

The light scalar mesons within quark models

\kappa

Complex Meson Spectroscopy

,

Kurt Symanzik : a stable fixed point beyond triviality

a_0

On (non-Hermitian) Lagrangeans in (particle) physics and their dynamical generation

(980) and

Consistent relativistic Quantum Theory for systems/particles described by non‐Hermitian Hamiltonians and Lagrangians

f_0

Constituent and current quark masses at low chiral energies

(980) may be reproduced in a model where mesons scatter via a

Scalar mesons and Adler zeros

q\bar{q}