Nucleon polarizabilities in covariant baryon chiral perturbation theory with explicit $\Delta$ degrees of freedom

M. Thürmann, E. Epelbaum, A. M. Gasparyan +1

We compute various nucleon polarizabilities in chiral perturbation theory implementing the $\Delta$-full ($\Delta$-less) approach up to order ${\epsilon }^3+q^4$ ($q^4$) in the small-scale (chiral)…