Parity-violating asymmetry in $\gamma d \to \vec{n}p$ with a pionless effective theory

TL;DR

This paper investigates nuclear parity violation in deuteron photodisintegration using a pionless effective field theory, aiming to determine weak interaction couplings through future experimental measurements of asymmetry.

Contribution

It introduces a pionless effective field theory approach with di-baryon fields to analyze parity violation in deuteron photodisintegration, providing a framework to extract weak couplings from experimental data.

Findings

Calculated parity-violating asymmetry up to 30 MeV photon energy

Provided a theoretical basis for future determination of weak couplings

Demonstrated the applicability of pionless EFT to low-energy nuclear parity violation

Abstract

Nuclear parity violation is studied with polarized neutrons in the photodisintegration of the deuteron at low energies. A pionless effective field theory with di-baryon fields is used for the investigation. Hadronic weak interactions are treated by parity-violating di-baryon-nucleon-nucleon vertices, which have undetermined coupling contants. A parity-violating asymmetry in the process is calculated for the incident photon energy up to 30 MeV. If experimental data for the parity-violating asymmetry become available in the future, we will be able to determine the unknown coupling contants in the parity-violating vertices.