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

Abstract

We calculate the forward spin-dependent photon-nucleon Compton amplitude as a function of photon energy at the next-to-leading ($\mathcal{O}(p^4)$) 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.

Comments: 7 pages, latex, 2 figures included as .eps files