Endpoint Relations for Baryons

Understand

Following our earlier work we establish kinematic endpoint relations for baryon decays using the Wigner-Eckart theorem and apply them to $\frac{1}{2} \to \frac{1}{2}$ and $\frac{1}{2} \to \frac{3}{2}$ baryon transitions.

• We provide angular distributions at the kinematic endpoint which hold for the generic $d=6$ model-independent effective Hamiltonian.
• Moreover, we explicitly verify the endpoint relations using an explicit form factor parametrisation and clarify constraints on helicity based form factors to evidence endpoint relations.
• Our results provide guidance for phenomenological parameterisations, consistency checks for theory computations and experiment.