The Nucleon Spin Polarizability at Order ${\cal O}(p^4$) in Chiral Perturbation Theory

TL;DR

This paper computes the nucleon spin polarizability at order ${ m O}(p^4)$ in chiral perturbation theory, revealing significant corrections beyond leading order, which enhances understanding of nucleon structure.

Contribution

It provides the first calculation of the nucleon spin polarizability at ${ m O}(p^4)$ in chiral perturbation theory, including large correction effects.

Findings

Large correction to leading order spin polarizability

Quantitative estimate of ${ m O}(p^4)$ contributions

Improved theoretical understanding of nucleon structure

Abstract

We calculate the forward spin-dependent photon-nucleon Compton amplitude as a function of photon energy at the next-to-leading (${\cal O}(p^4)$) order in chiral perturbation theory, from which we extract the contribution to nucleon spin polarizability. The result shows a large correction to the leading order contribution.