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## A New Limit on Time-Reversal Violation in Beta Decay

### Abstract

We report the results of an improved determination of the triple correlation $D P \cdot(p_{e}\times p_{\nu})$ that can be used to limit possible time-reversal invariance in the beta decay of polarized neutrons and constrain extensions to the Standard Model. Our result is $D=(-0.96\pm 1.89 (stat)\pm 1.01 (sys))\times 10^{-4}$. The corresponding phase between g_A and g_V is $\phi_{AV} = 180.013^\circ\pm0.028^\circ$ (68 % confidence level). This result represents the most sensitive measurement of D in beta decay.Comment: 4 pages, 4 figures Fixed typos, a Ref., and Fig.

Topics: Nuclear Experiment
Year: 2011
DOI identifier: 10.1103/PhysRevLett.107.102301
OAI identifier: oai:arXiv.org:1104.2778