Radiative corrections to Gamow-Teller decays

Understand

Radiative corrections in the electroweak sector constitute an essential component in the ability to disentangle Beyond Standard Model physics from experimental data.

• This is particularly relevant for strongly bound systems undergoing weak decays such as nuclear $\beta$ decay, where its contribution to top-row CKM unitarity tests is essential.
• In this Letter we note the need for an additional radiative correction to the Gamow-Teller form factor in allowed decays.
• It concerns a combination of electrostatic final state interactions and QCD-induced currents.