Bridging over p-wave pi-production and weak processes in few-nucleon systems with chiral perturbation theory

Understand

I study an aspect of chiral perturbation theory (\chi PT) which enables one to ``bridge'' different reactions.

• That is, an operator fixed in one of the reactions can then be used to predict the other.
• For this purpose, I calculate the partial wave amplitude for the p-wave pion production (pp\to pn\pi^+) using the pion production operator from the lowest and the next nonvanishing orders.
• The operator includes a contact operator whose coupling has been fixed using a matrix element of a low-energy weak process (pp\to de^+\nu_e).