Improved Tensor Current Limit from B8 β Decay Including New Recoil-Order Calculations

• DOI: 10.1103/physrevlett.132.142502
• Publication Date: 2024-04-03T14:40:58Z
• Authors: B. Longfellow; A. T. Gallant; G. H. Sargsyan; M. T. Burkey; T. Y. Hirsh; G. Savard; N. D. Scielzo; L. Varriano; M. Brodeur; D. P. Burdette; J. A. Clark; D. Lascar; K. D. Launey; P. Mueller; D. Ray; K. S. Sharma; A. A. Valverde; G. L. Wilson; X. L. Yan

A precision measurement of the β^{+} decay ^{8}B was performed using Beta-decay Paul Trap to determine β-ν angular correlation coefficient a_{βν}. The experimental results were combined with new ab initio symmetry-adapted no-core shell-model calculations yield second-most precise from Gamow-Teller decays, a_{βν}=-0.3345±0.0019_{stat}±0.0021_{syst}. This value agrees standard model -1/3 and improves uncertainties in by nearly a factor 2. By combining ^{8}Li, tight limit on tensor current coupling right-handed neutrinos obtained. recent global evaluation all other β studies suggested nonzero for neutrino contradiction at just above 3σ. present are comparable sensitivity do not support this finding.