Couplings of NN(n\pi) n \geq 1

TL;DR

This paper predicts the couplings of nucleon-pion systems using a quark model and chiral meson theory, confirming known values and providing new insights into multi-pion couplings.

Contribution

It introduces a combined quark and chiral field theoretical approach to predict nucleon-pion couplings, including multi-pion interactions, aligning with known data and explaining pion as a Goldstone boson.

Findings

Predicted N N π coupling matches current experimental values.

Established that N N 2π coupling arises naturally from pion's Goldstone boson nature.

Provided predictions for N N (n π) couplings for n ≥ 2.

Abstract

Determinations of the couplings of $N N (n \pi) (n \geq 1)$ are reported. The study is based on both a quark model of nucleon and a chiral field theory of mesons. The coupling of $N N \pi$ is predicted and is in agreement with current value. It shows that the coupling $ N N 2 \pi $ is resulted in the nature that pion is a Goldstone boson. The couplings of $N N (n \pi) (n \geq 2)$ are predicted by this approach.