Di-quark effective theory; Roles of colored clusters

Oka, Makoto   

Diquarks are important degrees of freedom for the structure and dynamics of hadrons, in particular multi-quark hadrons, which are recently observed in experiment. We propose a chiral effective theory for colored diquarks based on the chiral representations of scalar and pseudoscalar diquarks. The effective Lagrangian can possess two mass terms, a chiral invariant and a chiral symmetry breaking terms. From Lattice QCD calculations of diquark specrum, we can determine each term separately and thus can predict the behaviors of diquarks under the change of chiral condensates. We further introduce vector and axialvector diquarks in the effective theory.