NIST logo

Publication Citation: A New Limit on Time-Reversal Violation in Beta Decay

NIST Authors in Bold

Author(s): Hans P. Mumm; T E. Chupp; K P. Coulter; R L. Cooper; S J. Freedman; B. K. Fujikawa; A. Garcia; G L. Jones; Jeffrey S. Nico; Alan K. Thompson; C A. Trull; J. F. Wilkerson; F. E. Wiefeldt;
Title: A New Limit on Time-Reversal Violation in Beta Decay
Published: September 02, 2012
Abstract: We report the results of an improved determination of the triple correlation DP , (p_e × p_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)) × 10e-4. The corresponding phase between g_A and g_V is 180.013 ± 0.028 degrees (68% confidence level). This result represents the most sensitive measurement of D in nuclear beta decay.
Citation: Physical Review Letters
Volume: 107
Pages: pp. 1 - 5
Keywords: baryon asymmetry; neutron decay; symmetries, time-reversal
Research Areas: Neutron Physics