A proposal of a renormalizable Nambu - Jona-Lasinio model
Starts 30 Aug 2018 14:30
Ends 30 Aug 2018 16:00
Central European Time
Leonardo Building - Euler Lecture Hall
Abstract. A local and gauge invariant gauge field model including Nambu - Jona-Lasinio (NJL) and QCD Lagrangian terms in its action is introduced. Surprisingly, it becomes power counting renormalizable. This occurs thanks to the presence of action terms which modify the quark propagators, to become more decreasing that the Dirac one at large momenta in a Lee-Wick form, implying power counting renormalizability. The appearance of finite quark masses already in the tree approximation in the scheme is determined by the fact that the new action terms explicitly break chiral invariance. In this starting work we present the renormalized Feynman diagram expansion of the model and derive the formula for the degree of divergence of the diagrams.