Symmetry violations in nuclear and neutron $\beta$ decay

Understand

The role of $\beta$ decay as a low-energy probe of physics beyond the Standard Model is reviewed.

• Traditional searches for deviations from the Standard Model structure of the weak interaction in $\beta$ decay are discussed in the light of constraints from the LHC and the neutrino mass.
• Limits on the violation of time-reversal symmetry in $\beta$ decay are compared to the strong constraints from electric dipole moments.
• Novel searches for Lorentz symmetry breaking in the weak interaction in $\beta$ decay are also included, where we discuss the unique sensitivity of $\beta$ decay to test Lorentz invariance.