The $1/N_c$ Operator Analysis of the Combined Octet and Decuplet Baryons Contact Interactions in SU(3) Chiral Effective Field Theory

TL;DR

This paper constructs and analyzes the contact interactions of octet and decuplet baryons within SU(3) Chiral Effective Field Theory, employing a $1/N_c$ expansion to reduce free parameters and derive sum rules relevant for lattice QCD tests.

Contribution

It introduces a systematic $1/N_c$ operator analysis to simplify and constrain the baryon contact interactions in SU(3) ChEFT, reducing the number of free parameters significantly.

Findings

Reduced LECs from 134 to 24 at NLO using $1/N_c$ expansion.

Derived sum rules for $ ext{ΩΩ}$ and $ ext{ΩN}$ scatterings.

Provided a framework for future lattice QCD validation.

Abstract

In this work, we construct the non-derivative four-point interactions for Octet and Decuplet baryons in the SU(3) Chiral Effective Field Theory (ChEFT) framework, and there are 104 coupling constant terms. The non-relativistic expansion of the baryon fields has been considered up to the Next-to-Leading Order (NLO) of the three-momentum expansion. We find 28 and 106 Low-Energy Constants (LECs) for Leading Order (LO) and NLO, respectively. Using the Hartree Hamiltonian of the $1/N_c$ expansion of the operator product up to Next-to-Next-to-Leading Order (NNLO), we can reduce the free parameters (LECs) of the ChEFT from 134 down to 24 up to NLO of the three-momentum expansion. Moreover, we will discuss the implications of the $1/N_c$ sum rules in $\Omega\Omega$ and $\Omega N$ scatterings, where the future results from lattice QCD can be used to test our sum rules.