Nucleon Polarisabilities from Deuteron Compton Scattering, and Its Lessons for Chiral Power Counting
Abstract
A brief review of Compton scattering off the deuteron in Chiral Effective Field Theory, including gauge invariance and the correct Thomson limit. We model-independently determine the iso-scalar, spin-independent dipole polarisabilities of the nucleon at zero energy from all Compton data below 100 MeV as αE1s=11.3+-0.7stat\+-0.6Baldin+-1theory, βM1s=3.2-+0.7stat+-0.6Baldin+-1theory, each in 10-4 fm3. Proton and neutron polarisabilities are therefore identical within (predominantly statistical) errors.
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