Separation of proton polarizabilities with the beam asymmetry of Compton scattering

Abstract

We propose to determine the magnetic dipole polarizability of the proton directly from the beam asymmetry of low-energy Compton scattering based on the fact that the leading non-Born contribution to the asymmetry is due to the magnetic polarizability alone; the electric polarizability cancels out. The beam asymmetry thus provides the simplest observable with a clean separation of the magnetic polarizability from the electric one. Introducing polarizabilities in a Lorentz-invariant fashion we compute the higher-order (recoil) effects of polarizabilities on beam asymmetry and show that these effects are most suppressed in forward kinematics. With the prospects of precision Compton experiments at the MAMI and HIGS facilities in mind, we argue why the beam asymmetry could be the best way to measure the elusive magnetic polarizability of the proton.

4 pages, 3 figures; published version

References in corpus (4)

• Nucleon Electromagnetic Form Factors
• Using effective field theory to analyse low-energy Compton scattering data from protons and light nuclei
• Compton scattering from the proton in an effective field theory with explicit Delta degrees of freedom
• What different variants of chiral EFT predict for the proton Compton differential cross section - and why

Cited by in corpus (10)

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• Hadron Polarizabilities
• Proton polarisabilities from Compton data using Covariant Chiral EFT
• Determination of the scalar polarizabilities of the proton using beam asymmetry ${\Sigma }_3$ in Compton scattering
• Partial-wave analysis of proton Compton scattering data below the pion-production threshold
• Comprehensive Study of Observables in Compton Scattering on the Nucleon
• Proton Compton scattering in a unified proton-Delta Model
• Dispersion theory of nucleon polarizabilities and outlook on chiral effective field theory
• Proton polarizabilities from polarized Compton scattering: low-energy expansion
• Spin polarizabilities and characteristics of spin-one hadrons related parity non-conservation in the the Duffin-Kemmer-Petiau formalism