β Scribed by Hartmut Krasemann
No coin nor oath required. For personal study only.
We study symmetry breaking via quark mass differences in a relativistic quark model where mesons are built from heavy (m B 3 GeV) spin -$ quarks and antiquarks. The meson (squared-)mass differences are linearly related to the number of strange, charmed, etc. quarks in the mesons. We show that the previously assumed SU, symmetry of the mesonic couplings holds, i.e., quark mass differences only show up in the masses of the external particles, not in the three meson vertex itself.
π SIMILAR VOLUMES
Phenomenological aspects of SU(3)-breaking in VPP, PPy, VPy and Pyy vertices involving pseudoscalar-mesons (P), vector-mesons (V) and photons are discussed in the framework of a generic constituent-quark model. A rather satisfactory description is achieved adding some relevance to this type of model
On the basis of a effective "superconductivity"-type four-quark interaction, phenomenological Lagrangians are obtained for interactions of scalar, pseudoscalar, vector. and axial vector meson nonets. The Lagrangians include mass terms breaking chiral and U(3) invariance and corresponding to the quar
We prove asymptotic completeness for the scattering of two non-relativistic spinless mesons, when each meson is composed of a quark and antiquark bound together by a confining potential, so that free quarks may not result from the collision. 20