Radiative corrections to superallowed beta decays at $\mathcal{O}({\alpha }^{2}Z)$

Òscar L. Crosas, Emanuele Mereghetti

We compute $\mathcal{O}({\alpha }^{2}Z)$ radiative corrections to superallowed $\beta$ decays with a heavy-particle effective field theory that systematically describes the interactions of low-e…