Two parity violating asymmetries from $n p \to d \gamma$ in pionless effective field theories

TL;DR

This paper calculates two parity-violating asymmetries in neutron-proton radiative capture using pionless effective field theory, aiming to facilitate parameter extraction from experimental data.

Contribution

It provides theoretical predictions for parity-violating asymmetries in np to d gamma processes using pionless EFT with and without dibaryon fields, enhancing understanding of weak interactions in nuclear physics.

Findings

Calculated two parity-violating asymmetries in np to d gamma.

Showed how experimental data could determine five key parameters.

Compared results with previous parity-violating observables.

Abstract

We consider parity-violating observables from the processes $\vec n p\to d \gamma$ and $ np \to d \overset {\circlearrowleft}{\gamma}$. We perform calculations using pionless effective field theory both with and without explicit dibaryon fields. After combining these results with ones we have already obtained on parity-violating asymmetries in $\vec NN$ scattering, experimental input would in principle allow the extraction of all five parameters occurring at leading order in the parity-violating Lagrangian.