Improved Limit on Tensor Currents in the Weak Interaction from $^8$Li $\beta$ Decay
Phys. Rev. Lett. 128, 202502 (2022) 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...
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Zusammenfassung: | Phys. Rev. Lett. 128, 202502 (2022) 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. |
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DOI: | 10.48550/arxiv.2205.01865 |