A New Limit on Time-Reversal Violation in Beta Decay

Journal Article · Tue Apr 26 00:00:00 EDT 2011 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.107.102301· OSTI ID:1022737

Mumm, H P; Chupp, T E; Cooper, R L; Coulter, K P; Freedman, S J; Fujikawa, B K; Garcia, A; Jones, G L; Nico, J S; Thompson, A K; Trull, C A; Wilkerson, J F; Wietfeldt, F E

We report the results of an improved determination of the triple correlation DP {center_dot} (p{sub e} x p{sub v}) 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 {+-} 1.89(stat) {+-} 1.01(sys)) x 10{sup -4}. The corresponding phase between g{sub A} and g{sub V} is {phi}{sub AV} = 180.013{sup o} {+-} 0.028{sup o} (68% confidence level). This result represents the most sensitive measurement of D in nuclear beta decay.

• Research Organization: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
• Sponsoring Organization: Nuclear Science Division
• DOE Contract Number: DE-AC02-05CH11231
• OSTI ID: 1022737
• Report Number(s): LBNL-4637E; PRLTAO; TRN: US1104352
• Journal Information: Physical Review Letters, Vol. 107, Issue 10; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

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BETA DECAY
NEUTRONS
STANDARD MODEL
T INVARIANCE