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Nucleon Polarisabilities from Deuteron Compton Scattering, and Its Lessons for Chiral Power Counting · arXivDesk

nucl-th/0611074Nov 20, 20063 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

Nucleon Polarisabilities from Deuteron Compton Scattering, and Its Lessons for Chiral Power Counting

Harald W. Griesshammer

Nuclear Theory

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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 fm³. Proton and neutron polarisabilities are therefore identical within (predominantly statistical) errors.

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The paper addresses: Nucleon Polarisabilities from Deuteron Compton Scattering, and Its Lessons for Chiral Power Counting.
A brief review of Compton scattering off the deuteron in Chiral Effective Field Theory, including gauge invariance and the correct Thomson limit.

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Author comment: 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