WEAKLY BOUND DIQUARKS AND EFIMOV HYPERONS IN QCD

摘要

We study an extended color gauge invariant Quantum Chromodynamics(QCD) effective model with quarks, gluons and scalar color anti-triplets. We show that in a condensed phase of diquarks, the gluon and the photon acquire dynamical masses. In the BEC phase and near the zero-binding diquark transition, it is possible the onset of the Thomas-Efimov effect for some three-quark systems, like the hyperonic quartet-spin channel. We also evaluate the running coupling constant in lowest perturbative order in the extended color gauge model. Our calculation suggests that the freezing of the coupling constant can occur for a small number of quark and diquark flavors.