Speaker
茂義 青山
(KEK)
Description
A framework is presented in which the baryon decouplets treated as a resonance in QCD sum rules and its decay width is determined self-consistently. The δ-pole approximation of the two-point correlation function is analytically continued to a complex-
conjugate pair of poles characterized by a mass, a width, and a complex residue, an expression
that reduces exactly to the δ pole as the width vanishes. The two-point correlator is found to
constrain the mass and the residue but to leave the width degenerate with the mass; the width
is therefore supplied by a light-cone three-point sum rule for the strong coupling; e.g. g∆Nπ for Δ++.
Author
茂義 青山
(KEK)