INFRARED BEHAVIOR OF THE ATTRACTIVE DI-QUARK CHANNEL IN THE QCD MODEL

Abstract

We examine the behavior of the attractive di-quark (qq) channel in the infrared region. Conventionally it is considered that the qq channel does not cause the fermion condensation in spite of its attractive interaction, because the quark field is dynamically massive due to the quark–antiquark condensation and the decoupling dynamics is applied. In this paper, we are going to reconsider rigorously the infrared behavior of the qq channel with paying attention to the stability of the effective action. And it is revealed that the behavior is not naively decided by the decoupling dynamics.