Compton Scattering by the Nucleon

Abstract

The status of Compton scattering by the nucleon at energies of the first and second resonance is summarized. In addition to a general test of dispersion theories and a precise determination of polarizabilities, the validities of four fundamental sum rules are explored. {\it Recommended} averages of experimental values for the electromagnetic polarizabilities and spin-polarizabilities of the nucleon are determined: ${\alpha }_p=12.0\pm 0.6$, ${\beta }_p=1.9\mp 0.6$, ${\alpha }_n=12.5\pm 1.7$, ${\beta }_n=2.7\mp 1.8$ (unit $10^{-4}$fm${}^3$), ${\gamma }_{\pi }^{(p)}=-38.7\pm 1.8$, ${\gamma }_{\pi }^{(n)}=58.6\pm 4.0$ (unit $10^{-4}$fm${}^4$).

version appearing in the conference proceedings

References in corpus (5)

• Dispersion relations in real and virtual Compton scattering
• Quasi-free Compton Scattering and the Polarizabilities of the Neutron
• Ground-State Scalar $\bar{q}q$ Nonet: SU(3) Mass Splittings and Strong, Electromagnetic, and Weak Decay Rates
• The Present Status on sigma and kappa Meson Properties
• Studies on the electromagnetic structure of the nucleon by free and quasi-free Compton scattering at MAMI (Mainz)

Cited by in corpus (1)

• Electromagnetic polarizabilities of the nucleon and properties of the $\sigma$-meson pole contribution