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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Hauptverfasser: 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
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Sprache:eng
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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.
DOI:10.48550/arxiv.2205.01865