Hadronic coupling constants in lattice QCD

TL;DR

This paper calculates hadronic coupling constants $g_{\rho\pi\pi}$ and $g_{nn\pi}$ using lattice QCD with four dynamical flavors, providing ab initio results that align with experimental data.

Contribution

It presents the first ab initio lattice QCD calculations of these specific hadronic coupling constants with four flavors of dynamical fermions.

Findings

Coupling constants are compatible with experimental values.

Method uses 2-point and 3-point Green's functions.

Results demonstrate the effectiveness of lattice QCD for hadronic interactions.

Abstract

We report on calculations of the hadronic coupling constants $g_{\rho\pi\pi}$ and $g_{nn\pi}$ based on lattice QCD with four flavors of dynamical staggered fermions. By computing 2--point and 3--point Green's functions we have been able to determine these coupling constants ab initio from QCD; the results are compatible with the experimental values.