Improved Limit on Tensor Currents in the Weak Interaction from Li8 β Decay

Here, 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 $β-\bar{ν}$ corr...

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Bibliographic Details
Published in:Physical review letters 2022-05, Vol.128 (20)
Main Authors: Burkey, M.  T., Savard, G., Gallant, A.  T., Scielzo, N.  D., Clark, J.  A., 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., Pérez Galván, A., Pierce, J.  R., Ray, D., Segel, R., Siegl, K., Sharma, K.  S., Wang, B.  S.
Format: Article
Language:English
Subjects:
beta decay
cooling
NUCLEAR PHYSICS AND RADIATION PHYSICS
nuclear tests of fundamental interactions
radioactive beams
trapped ions
trapping
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Summary:Here, 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 $β-\bar{ν}$ correlation of trapped 8Li ions with the Beta-decay Paul Trap. We find $a_{β\barν}$ = - 0.3325 ± 0.0013stat ± 0.0019syst at 1σ for the case of coupling to right-handed neutrinos (CT = -C$^{'}_{T}$), which is consistent with the standard model prediction.
ISSN:0031-9007
1079-7114