Looking at radiative corrections to the ${\mathrm{\Sigma }}^{\pm }\to \mathrm{\Lambda }{e}^{\pm }\bar{\nu }$ semileptonic decay-rate ratio

We investigate the impact of radiative corrections on the ratio of the semileptonic decay rates ${\mathrm{\Sigma }}^{\pm }\to \mathrm{\Lambda }{e}^{\pm }\bar{\nu }$. Phenomenological analyses point to sizable radiative effects on the experimentally measured ratio. From a theoretical perspective, this observable is particularly appealing because several hadronic and electroweak contributions partially cancel in the ratio, providing a cleaner probe of electromagnetic effects. We identify the dominant contributions to the radiative corrections and develop the framework for a dedicated calculation. This represents a first step toward a precise theoretical description of baryon semileptonic decays, helping to assess their potential as precision tests of the Standard Model.