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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

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Physical Review Letters
|June 3, 2022
PubMed
Summary
This summary is machine-generated.

This study precisely measured tensor currents in beta decay using trapped Lithium-8 ions. Results align with the Standard Model, supporting its description of electroweak interactions.

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Area of Science:

  • Particle Physics
  • Nuclear Physics
  • Standard Model

Background:

  • The Standard Model describes electroweak interactions with a vector-axial-vector structure.
  • Lorentz-invariant components can also contribute to electroweak interactions.

Purpose of the Study:

  • To provide the most precise measurement of tensor currents in the low-energy regime.
  • To examine the beta-neutrino correlation in trapped Lithium-8 ions.

Main Methods:

  • Utilized the Beta-decay Paul Trap for ion trapping.
  • Measured the beta-neutrino correlation of trapped Lithium-8 ions.

Main Results:

  • Determined the beta-neutrino correlation coefficient a_{βν} = -0.3325 ± 0.0013 (stat) ± 0.0019 (syst).
  • This measurement is consistent with the Standard Model prediction for coupling to right-handed neutrinos (C_{T}=-C_{T}^{'}).

Conclusions:

  • The findings support the Standard Model's description of electroweak interactions.
  • The precise measurement of tensor currents provides stringent tests of fundamental physics.