Document Type
Article
Publication Date
4-5-2024
Abstract
A precision measurement of the β+ decay of B8 was performed using the Beta-decay Paul Trap to determine the β-ν angular correlation coefficient aβν. The experimental results were combined with new ab initio symmetry-adapted no-core shell-model calculations to yield the second-most precise measurement from Gamow-Teller decays, aβν=-0.3345±0.0019stat±0.0021syst. This value agrees with the standard model value of -1/3 and improves uncertainties in B8 by nearly a factor of 2. By combining results from B8 and Li8, a tight limit on tensor current coupling to right-handed neutrinos was obtained. A recent global evaluation of all other precision β decay studies suggested a nonzero value for right-handed neutrino coupling in contradiction with the standard model at just above 3σ. The present results are of comparable sensitivity and do not support this finding.
Publication Source (Journal or Book title)
Physical Review Letters
Recommended Citation
Longfellow, B., Gallant, A., Sargsyan, G., Burkey, M., Hirsh, T., Savard, G., Scielzo, N., Varriano, L., Brodeur, M., Burdette, D., Clark, J., Lascar, D., Launey, K., Mueller, P., Ray, D., Sharma, K., Valverde, A., Wilson, G., & Yan, X. (2024). Improved Tensor Current Limit from B 8 β Decay Including New Recoil-Order Calculations. Physical Review Letters, 132 (14) https://doi.org/10.1103/PhysRevLett.132.142502