Decay ofΘ+in a quark model

beta decay of hyperons in a relativistic quark model.

A relativistic constituent quark model is used to calculate the semileptonic beta decay of nucleons and hyperons. The parameters of the model, namely, the constituent quark mass and the confinement scale, are fixed by a previous calculation of the magnetic moments of the baryon octet within the same model. We discuss the momentum dependence of the form factors, possible configuration mixing and...

Quark Production and Decay †

Direct and indirect information on the top quark mass and its decay modes is reviewed. The theory of top production in hadron-and electron-positron-colliders is presented.

Vector Quark Model and B Meson Radiative Decay

We study the B meson radiative decay B → Xsγ in the vector quark model. Deviation from the Standard Model arises from the non-unitarity of the charged current KM matrix and related new FCNC interactions. We establish the relation between the non-unitarity of charged current mixing matrix and the mixing among the vector quark and the ordinary quarks. We also make explicitly the close connection ...

Heavy Quark Spectroscopy and Decay

Quark Confinement in a Constituent Quark Model

On the level of an effective quark theory, we define confinement by the absence of quark anti-quark thresholds in correlation functions. We then propose a confining Nambu-Jona-Lasinio-type model. The confinement is implemented in analogy to Anderson localization in condensed matter systems. We study the model's phase structure as well as its behavior under extreme conditions, i.e. high temperat...