A New Limit on Time-Reversal Violation in Beta Decay

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arxiv: 1104.2778 · v2 · pith:WHI5D5JHnew · submitted 2011-04-14 · ⚛️ nucl-ex

A New Limit on Time-Reversal Violation in Beta Decay

H. P. Mumm (1 , 2) , T. E. Chupp (3) , R. L. Cooper (3) , K. P. Coulter (3) , S. J. Freedman (4) , B. K. Fujikawa (4) , A. Garcia (2

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5) G. L. Jones (6) J. S. Nico (1) A. K. Thompson (1) C. A. Trull (7) J. F. Wilkerson (8 F. E. Wietfeldt (7) ((1) National Institute of Standards Technology Gaithersburg MD (2) CENPA Physics Department University of Washington Seattle WA (3) Physics Department University of Michigan Ann Arbor MI (4) Physics Department University of California at Berkeley Lawrence Berkeley National Laboratory Berkeley CA (5) Department of Physics University of Notre Dame Notre Dame IN (6) Physics Department Hamilton College Clinton NY (7) Physics Department Tulane University New Orleans LA (8) Department of Physics Astronomy University of North Carolina Chapel Hill NC)

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keywords betadecaycirclimitresulttime-reversaltimescdot

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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.

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A New Limit on Time-Reversal Violation in Beta Decay

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