6533b7cffe1ef96bd1258f0f
RESEARCH PRODUCT
Separation of proton polarizabilities with the beam asymmetry of Compton scattering
Vladimir PascalutsaNadiia Krupinasubject
PhysicsNuclear TheoryProtonmedia_common.quotation_subjectCompton scatteringGeneral Physics and AstronomyFOS: Physical sciencesAsymmetryNuclear physicsNuclear Theory (nucl-th)High Energy Physics - PhenomenologyRecoilHigh Energy Physics - Phenomenology (hep-ph)PolarizabilityPhysics::Atomic and Molecular ClustersPhysics::Accelerator PhysicsPhysics::Atomic PhysicsAtomic physicsPhysics::Chemical PhysicsNuclear Experiment (nucl-ex)Nuclear ExperimentMicrotronMagnetic dipoleBeam (structure)media_commondescription
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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2013-04-27 |