G. Rupp

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

The quark-level linear σ model (LσM) is revisited, in particular concerning the identification of the f0(400–1200) (or σ(600)) scalar meson as the chiral partner of the pion. We demonstrate the predictive power of the LσM through the ππ and πNs-wave scattering lengths, as well as several electromagnetic, weak, and strong decays of pseudoscalar and vector mesons. The ease with which the data for these observables are reproduced in the LσM lends credit to the necessity to include the σ as a fundamental degree of freedom, to be contrasted with approaches like chiral perturbation theory or the confining NJL model of Shakin and Wang.

Unquenched quark-model calculation of {\varvec{X(3872)}} electromagnetic decays

A recent quark-model description of

SU (3) Mass Splittings for q̄q Mesons and qqq Baryons

X(3872)

Spectra and strong decays of cc-bar and bb-bar states

X(3872) as an unquenched

Possible ψ(5S), ψ(4D), ψ(6S), and ψ(5D) signals in ΛcΛc

2,{}^{3!}P_1

A low -lying scalar m eson nonet in a unitarized m eson m odel

23P1