Using EFT to analyze low-energy Compton scattering from protons and light nuclei

TL;DR

This paper applies chiral effective field theory to analyze low-energy Compton scattering data from protons and deuterons, extracting their electric and magnetic polarizabilities with quantified uncertainties.

Contribution

It provides a detailed chiral EFT framework for analyzing Compton scattering data, yielding precise polarizability values and uncertainties for protons and deuterons, advancing theoretical understanding.

Findings

Proton electric polarizability: 10.5 +/- 0.5(stat) +/- 0.8(theory)

Proton magnetic polarizability: 2.7 +/- 0.5(stat) +/- 0.8(theory)

Deuteron scalar polarizabilities: 10.5 +/- 2.0(stat) +/- 0.8(theory)

Abstract

We discuss the application of an effective field theory (EFT) which incorporates the chiral symmetry of QCD to Compton scattering from the proton and deuteron. We describe the chiral EFT analysis of the proton Compton scattering database presented in our recent review (arXiv:1203.6834), which gives: alpha^{(p)}=10.5 +/- 0.5(stat) +/- 0.8(theory); beta^{(p)}= 2.7 +/- 0.5(stat) +/- 0.8(theory), for the electric and magnetic dipole polarizability of the proton. We also summarize the chiral EFT analysis of the world data on coherent Compton scattering from deuterium presented in arXiv:1203.6834. That yields: alpha^{(s)}=10.5 +/- 2.0(stat) +/- 0.8(theory); beta^{(s)}=3.6 +/- 1.0(stat) +/- 0.8(theory).