C. Dullemond

A low lying scalar meson nonet in a unitarized meson model

AbstractA unitarized non-relativistic meson model which is successful for the description of the heavy and light vector and pseudo-scalar mesons yields in its extension to the scalar mesons for the same model parameters a complete nonet below 1 GeV. In the unitarization scheme real and virtual meson meson decay channels are coupled to the quark antiquark confinement channels. The flavor dependent harmonic oscillator confining potential itself has bound states ɛ(1.3 GeV),S(1.5 GeV), δ(1.3 GeV), κ(1.4 GeV), similar to the results of other bound stateq

Scalar field propagators in anti‐de Sitter space‐time

\bar q

Confining potentials and Regge poles

models. However, the full coupled channel equations show poles at ɛ(0.5 GeV),S(0.99 GeV), δ(0.97 GeV), κ(0.73 GeV). Not only these pole positions can be calculated in our model also cross sections and phase shifts in the meson scattering channels which are in reasonable agreement with the available data for ππ, ηπ andKπ inS-wave scattering.

Quark-gluon model with conformal symmetry

An outline is given for the description of heavy-quark--antiquark systems by means of a set of coupled Schroedinger equations in which permanently confined two-fermion channels are coupled to free two-boson channels. Only two-particle decays satisfying the Okubo-Zweig-Iizuka rule are taken into account. Within this context the equations make a simple determination of the spectra and decay parameters possible. A comparison with the data is presented.

A numerical method for solving a coupled channel Schrödinger equation

Simple expressions are found for the retarded, advanced, and Feynman propagators, as well as several other auxiliary invariant functions, for scalar fields of arbitrary mass in anti‐de Sitter space‐time.

Dielectric Description of Hadrons With Anti-de Sitter Symmetry

AbstractIn a multichannel treatment of the

Propagators for Massive Vector Fields in Anti-de Sitter Space-time Using Stueckelberg's Lagrangian

q\bar q