학술논문
Improved Limit on Tensor Currents in the Weak Interaction from $^8$Li $\beta$ Decay
Document Type
Working Paper
Author
Burkey, M. T.; Savard, G.; Gallant, A. T.; Scielzo, N. D.; Hirsh, T. Y.; Varriano, L.; Sargsyan, G. H.; Launey, K. D.; Brodeur, M.; Burdette, D. P.; Heckmaier, E.; Joerres, K.; Klimes, J. W.; Kolos, K.; Laminack, A.; Leach, K. G.; Levand, A. F.; Longfellow, B.; Maaß, B.; Marley, S. T.; Morgan, G. E.; Mueller, P.; Orford, R.; Padgett, S. W.; Galván, A. Pérez; Pierce, J. R.; Ray, D.; Segel, R.; Siegl, K.; Sharma, K. S.; Wang, B. S.
Source
Phys. Rev. Lett. 128, 202502 (2022)
Subject
Language
Abstract
The electroweak interaction in the Standard Model (SM) is described by a pure vector-axial-vector structure, though any Lorentz-invariant component could contribute. In this work, we present the most precise measurement of tensor currents in the low-energy regime by examining the $\beta$-$\bar{\nu}$ correlation of trapped $^{8}$Li ions with the Beta-decay Paul Trap. We find $a_{\beta\nu} = -0.3325 \pm 0.0013_{stat} \pm 0.0019_{syst}$ at $1\sigma$ for the case of coupling to right-handed neutrinos $(C_T=-C_T')$, which is consistent with the SM prediction.
Comment: 6 pages, 3 figures, 1 table
Comment: 6 pages, 3 figures, 1 table