Strong decays of singly heavy baryons from a chiral effective theory of diquarks

TL;DR

This paper develops a chiral effective theory for diquarks to analyze the strong decays of singly heavy baryons, predicting decay widths and exploring effects of chiral symmetry restoration.

Contribution

It introduces a novel chiral effective theory for scalar and vector diquarks, linking diquark interactions with mesons to heavy baryon decays and mass shifts.

Findings

Predicted decay widths for unobserved heavy baryons.

Identified symmetry-breaking effects in diquark interactions.

Analyzed mass and decay width changes under chiral symmetry restoration.

Abstract

A chiral effective theory of scalar and vector diquarks is formulated, which is based on $SU(3)_R\times SU(3)_L$ chiral symmetry and includes interactions between scalar and vector diquarks with one or two mesons. We find that the diquark interaction term with two mesons breaks the $U(1)_A$ and flavor $SU(3)$ symmetries. To determine the coupling constants of the interaction Lagrangians, we investigate one-pion emission decays of singly heavy baryons $Qqq$ ($Q=c, b$ and $q=u,d,s$), where baryons are regarded as diquark--heavy-quark two-body systems. Using this model, we present predictions of the unobserved decay widths of singly heavy baryons. We also study the change of masses and strong decay widths of singly heavy baryons under partial restoration of chiral symmetry.