Improved Limits on Long-Range Parity-Odd Interactions of the Neutron

TL;DR

This paper presents improved experimental limits on long-range parity-odd interactions of neutrons, significantly tightening constraints over previous studies for interaction ranges greater than 0.15 meters.

Contribution

It combines data from a polarized helium-3 experiment and equivalence-principle tests to set new, more stringent bounds on exotic neutron interactions over large distance scales.

Findings

Bounds on gAgV improved by 11 orders of magnitude for lambda > 1.0e8 meters.

Constraints on neutron parity-violating interactions are significantly tighter than previous limits.

Long-range neutron interactions are constrained at levels below recent neutron spin-precession studies.

Abstract

We show that a previous polarized 3He experiment at Princeton, plus Eot-Wash equivalence-principle tests, constrain exotic, long-ranged (lambda > 0.15m) parity-violating interactions of neutrons at levels well below those inferred from a recent study of the parity-violating spin-precession of neutrons transmitted through liquid 4He. For lambda > 1.0e8 meters the bounds on gAgV are improved by a 11 orders of magnitude.