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Improved Tensor Current Limit from ^{8}B β Decay Including New Recoil-Order Calculations.

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Precision measurements of Boron-8 beta decay confirm the Standard Model. This study provides the second-most precise Gamow-Teller decay data, improving uncertainties and setting limits on right-handed neutrinos.

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Area of Science:

  • Nuclear Physics
  • Particle Physics

Background:

  • Precision beta decay measurements are crucial for testing the Standard Model.
  • The Standard Model (SM) predicts specific values for fundamental constants and interactions.

Purpose of the Study:

  • To precisely measure the beta-neutrino angular correlation coefficient (aβν) in the β+ decay of Boron-8 (8B).
  • To test the Standard Model predictions for weak interactions.
  • To constrain the coupling of right-handed neutrinos by combining 8B and 8Li decay data.

Main Methods:

  • Utilized the Beta-decay Paul Trap for a high-precision measurement of 8B decay.
  • Performed ab initio symmetry-adapted no-core shell-model calculations.
  • Combined experimental results with theoretical calculations.

Main Results:

  • Determined aβν = -0.3345 ± 0.0019 (stat) ± 0.0021 (syst), the second-most precise value for Gamow-Teller decays.
  • Achieved a near factor of 2 improvement in uncertainty for 8B decay.
  • Obtained a tight limit on tensor current coupling to right-handed neutrinos.

Conclusions:

  • The measured aβν value agrees with the Standard Model prediction of -1/3.
  • The results do not support recent findings suggesting a non-zero right-handed neutrino coupling.
  • This study enhances the precision of fundamental physics tests using nuclear decays.