Abstract
Neutrons have been a useful probe in many fields of science, as well as an important physical system for study in themselves. Modern neutron sources provide extraordinary opportunities to study a wide variety of physics topics. Among them is a detailed study of the weak interaction. An overview of studies of the hadronic weak (quark-quark) as well as semi-leptonic (quark-lepton) interactions at the Spallation Neutron Source (SNS) is presented. These measurements, done in few-nucleon systems, are finally letting us gain knowledge of the hadronic weak interaction without the contributions from nuclear effects. Forthcoming results from the NPDGamma experiment will, due to the simplicity of the neutron, provide an unambiguous measurement of the long range pion-nucleon weak coupling (often referred to as h π ), which will finally test the theoretical predictions. Results from NPDGamma and future results from the n + 3 He experiment will need to be complemented by additional measurements to completely describe the hadronic weak interaction.
Highlights
The hadronic weak interaction has been an object of experimental study for many decades, but it still holds many mysteries
While parity violation has been observed many times in nuclear systems, corrections for nuclear effects are required in order to isolate any NN components
The NPDGamma and n +3 He experiments are set to test the strength of the hadronic weak interaction between nucleons
Summary
The hadronic weak interaction has been an object of experimental study for many decades, but it still holds many mysteries. The Fundamental Neutron Physics Beamline (FnPB) [1] at the SNS will be home to a series of experiments that aim to answer fundamental questions in nuclear physics, including studies of the hadronic weak interaction between nucleons. The NPDGamma and n +3 He experiments are set to test the strength of the hadronic weak interaction between nucleons. This interaction was first parametrized in terms of meson exchange in the DDH model [2] over thirty years ago. EFTs are useful in interpreting experimental data and calculations of parityviolating observables in systems of up to five nucleons are currently possible. Lattice QCD is on its way to becoming a reliable tool for hadronic parity violation calculations, and future experiments present exciting opportunities to test precise predictions
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
