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

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 gamma p scattering database presented in our recent review [1], which gives: alpha((p))(E1) = 10.5 +/- 0.5(stat) +/- 0.8(theory), beta((p))(M1) = 2.7 +/- 0.5(stat) +/- 0.8(theory), for the electric and magnetic dipole polarizability of the proton. We also summarize Ref. [1]'s chiral EFT analysis of the world data on coherent Compton scattering from deuterium, which yields: alpha((s))(E1) = 10.5 +/- 2.0(stat) +/- 0.8(theory), beta((s))(M1) = 3.6 +/- 1.0(stat) +/- 0.8(theory).