Relativity violations and beta decay

TL;DR

This paper investigates potential violations of relativity in quantum gravity theories, using beta decay experiments to set new constraints on these deviations and exploring future experimental sensitivities.

Contribution

It provides the first bounds on certain relativity-violating coefficients using beta decay data and estimates future experimental sensitivities.

Findings

Bounds of 3 x 10^{-8} GeV on two coefficients established

Existing data constrain relativity violations more tightly

Future experiments could improve sensitivity significantly

Abstract

In some quantum theories of gravity, deviations from the laws of relativity could be comparatively large while escaping detection to date. In the neutrino sector, precision experiments with beta decay yield new and improved constraints on these countershaded relativity violations. Existing data are used to extract bounds of $3 \times 10^{-8}$ GeV on the magnitudes of two of the four possible coefficients, and estimates are provided of future attainable sensitivities in a variety of experiments.