Explicit Delta(1232) Degrees of Freedom in Compton Scattering off the Deuteron

Abstract

We examine elastic Compton scattering off the deuteron for photon energies between 50 MeV and 100 MeV in the framework of chiral effective field theories to next-to-leading order. We compare one theoretical scheme with only pions and nucleons as explicit degrees of freedom to another in which the Delta(1232) resonance is treated as an explicit degree of freedom. Whereas pion degrees of freedom suffice to describe the experimental data measured at about 70 MeV, the explicit Delta(1232) gives important contributions that help to reproduce the angular dependence at higher energies. The static isoscalar dipole polarizabilities alpha_E^s and beta_M^s are fitted to the available data, giving results for the neutron polarizabilities alpha_E^n=(14.2+-2.0(stat)+-1.9(syst))*10^(-4)fm^3, beta_M^n=(1.8+-2.2(stat)+-0.3(syst))*10^(-4)fm^3. These values are in good agreement with previous experimental analyses. Comparing them to the well-known proton values we conclude that there is currently no evidence for significant differences between the proton and neutron electromagnetic dipole polarizabilities.

arXiv comment24 pages, 11 figures

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• Two-photon exchange effect on deuteron electromagnetic form factors
• Investigating Neutron Polarizabilities through Compton Scattering on ${}^3$He
• Analyzing the Effects of Neutron Polarizabilities in Elastic Compton Scattering off ${}^3$He
• Nucleon Polarizabilities from Deuteron Compton Scattering within a Green's-Function Hybrid Approach
• Elastic Compton Scattering from 3He and the Role of the Delta
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• Deuteron electromagnetic form factors in transverse plane with a phenomenological Lagrangian approach
• Nucleon Spin-Polarisabilities from Polarisation Observables in Low-Energy Deuteron Compton Scattering