Proton polarisabilities from Compton data using Covariant Chiral EFT

Abstract

We present a fit of the spin-independent electromagnetic polarisabilities of the proton to low-energy Compton scattering data in the framework of covariant baryon chiral effective field theory. Using the Baldin sum rule to constrain their sum, we obtain $\alpha =[10.6\pm 0.25$(stat)$\pm 0.2$(Baldin)$\pm 0.4$(theory)$]\times 10^{-4}$fm${}^3$ and $\beta =[3.2\mp 0.25$(stat)$\pm 0.2$(Baldin)$\mp 0.4$(theory)$]\times 10^{-4}$fm${}^3$, in excellent agreement with other chiral extractions of the same quantities.

4 pages, 2 figures

References in corpus (5)

• Using effective field theory to analyse low-energy Compton scattering data from protons and light nuclei
• Chiral Effective-Field Theory in the Delta(1232) Region: Pion Electroproduction on the Nucleon
• Compton scattering from the proton in an effective field theory with explicit Delta degrees of freedom
• Higher order forward spin polarizability
• What different variants of chiral EFT predict for the proton Compton differential cross section - and why

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• Nucleon Polarisabilities at and Beyond Physical Pion Masses
• Determination of the scalar polarizabilities of the proton using beam asymmetry ${\Sigma }_3$ in Compton scattering
• Generalized polarizabilities of the nucleon in baryon chiral perturbation theory
• Proton scalar dipole polarizabilities from real Compton scattering data, using fixed-t subtracted dispersion relations and the bootstrap method
• Sum rules across the unpolarized Compton processes involving generalized polarizabilities and moments of nucleon structure functions
• Forward doubly-virtual Compton scattering off the nucleon in chiral perturbation theory: the subtraction function and moments of unpolarized structure functions
• Spin-dependent sum rules connecting real and virtual Compton scattering verified
• Partial-wave analysis of proton Compton scattering data below the pion-production threshold
• Polarizability relations across real and virtual Compton scattering processes
• Comprehensive Study of Observables in Compton Scattering on the Nucleon
• Hyperon forward spin polarizability gamma0 in baryon chiral perturbation theory
• Proton Compton Scattering from Linearly Polarized Gamma Rays
• Nucleon polarizabilities in covariant baryon chiral perturbation theory with explicit $\Delta$ degrees of freedom
• First concurrent extraction of the leading-order scalar and spin proton polarizabilities
• Momentum transfer dependence of the proton's electric and magnetic polarizabilities
• Electromagnetic polarizabilities of the spin-$\frac{1}{2}$ singly heavy baryons in heavy baryon chiral perturbation theory
• Electromagnetic polarizabilities of the spin-$\frac{3}{2}$ baryons in heavy baryon chiral perturbation theory
• Theory Viewpoint on Extracting Nucleon Polarisabilities in Low-Energy Compton Scattering