Exploratory calculation of the rare hyperon decay ${\Sigma }^{+}\to p{\ell }^{+}{\ell }^{-}$ from lattice QCD

Felix Erben, Vera Gülpers, Maxwell T. Hansen +2

The rare hyperon decay ${\Sigma }^{+}\to p{\ell }^{+}{\ell }^{-}$ is a flavour-changing neutral current process mediated by an $s\to d$ transition that occurs only at loop level within the Standar…