Nucleon Polarisabilities from Deuteron Compton Scattering, and Its Lessons for Chiral Power Counting
arXiv:nucl-th/0611074 · doi:10.1142/9789812790804_0074
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 α_{E1}^s=11.3+-0.7_{stat}\+-0.6_{Baldin}+-1_{theory}, β_{M1}^s=3.2-+0.7_{stat}+-0.6_{Baldin}+-1_{theory}, each in 10^{-4} fm^3. Proton and neutron polarisabilities are therefore identical within (predominantly statistical) errors.
3 pages LaTeX2e, including 1 figures in 2 .eps files embedded with includegraphicx. Contribution to the 5th International Workshop on Chiral Dynamics, Theory and Experiment, Durham/Chapel Hill NC (USA), 18th -- 22nd September 2006. To be published in the proceedings