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Improved Limit on Tensor Currents in the Weak Interaction from ^{8}Li β Decay
M T Burkey1,2,3, G Savard2,3, A T Gallant1
1Lawrence Livermore National Laboratory, Livermore, California 94550, USA.
Abstract:
The electroweak interaction in the standard model is described by a pure vector-axial-vector structure, though any Lorentz-invariant component could contribute. In this Letter, we present the most precise measurement of tensor currents in the low-energy regime by examining the β-ν[over ¯] correlation of trapped ^{8}Li ions with the Beta-decay Paul Trap. We find a_{βν}=-0.3325±0.0013_{stat}±0.0019_{syst} at 1σ for the case of coupling to right-handed neutrinos (C_{T}=-C_{T}^{'}), which is consistent with the standard model prediction.
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