Hyperon forward spin polarizability gamma0 in baryon chiral perturbation theory

Abstract

We present the calculation of the hyperon forward spin polarizability gamma0 using manifestly Lorentz covariant baryon chiral perturbation theory including the intermediate contribution of the spin 3/2 states. As at the considered order the extraction of gamma0 is a pure prediction of chiral perturbation theory, the obtained values are a good test for this theory. After including explicitly the decuplet states, our SU(2) results have a very good agreement with the experimental data and we extend our framework to SU(3) to give predictions to the hyperons' gamma0 values. Prominent are the Sigma^- and Xi^- baryons as their photon transition to the decuplet is forbidden in SU(3) symmetry and therefore they are not sensitive to the explicit inclusion of the decuplet in the theory.

References in corpus (8)

• Electromagnetic excitation of the Delta(1232)-resonance
• Octet-baryon axial-vector charges and SU(3)-breaking effects in the semileptonic hyperon decays
• Electromagnetic structure of the lowest-lying decuplet resonances in covariant chiral perturbation theory
• Gold-plated moments of nucleon structure functions in baryon chiral perturbation theory
• Hadron Polarizabilities
• Proton polarisabilities from Compton data using Covariant Chiral EFT
• Higher order forward spin polarizability
• What different variants of chiral EFT predict for the proton Compton differential cross section - and why

Cited by in corpus (7)

• Nucleon Polarizabilities: from Compton Scattering to Hydrogen Atom
• Nucleon form factors in dispersively improved Chiral Effective Field Theory I: Scalar form factor
• Strong decays of the hadronic molecule ${\Omega }^{\ast }(2012)$
• Octet Baryons in Large Magnetic Fields
• Pion photoproduction off nucleons in covariant chiral perturbation theory
• $\Delta (1232)$ resonance in the $\vec{\gamma }p\to p{\pi }^0$ reaction at threshold
• Threshold pion electro- and photoproduction off nucleons in covariant chiral perturbation theory