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Optimized lepton universality tests in decays.

Gino Isidori1, Olcyr Sumensari1

  • 1Physik-Institut, Universität Zürich, 8057 Zurich, Switzerland.

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|November 26, 2020
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Summary
This summary is machine-generated.

We developed new methods to measure lepton flavor universality (LFU) ratios in B decays, reducing theoretical uncertainties. This enhances precision in testing the Standard Model by comparing beauty (b) and charm (c) meson decays.

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Area of Science:

  • High Energy Physics
  • Particle Physics
  • Flavor Physics

Background:

  • Lepton flavor universality (LFU) is a key prediction of the Standard Model (SM).
  • Deviations from LFU in B decays could indicate new physics.
  • Theoretical uncertainties in form factors complicate precise LFU tests.

Purpose of the Study:

  • To propose improved LFU ratios in semileptonic B decays.
  • To minimize theoretical form-factor uncertainties by comparing beauty (b) and charm (c) meson decays.
  • To enhance the sensitivity of LFU tests to new physics.

Main Methods:

  • Optimizing ratios by applying simple kinematic cuts or reweighting dilepton mass distributions.
  • Maximizing the cancellation of theoretical uncertainties between different decay modes.
  • Analyzing transitions involving B, D, and other relevant mesons.

Main Results:

  • Achieved significant reduction in theoretical uncertainties for LFU ratios.
  • Demonstrated effectiveness of proposed methods across various B decay channels.
  • Reached sub-percent uncertainties on SM predictions for improved LFU ratios.

Conclusions:

  • The proposed optimized LFU ratios offer a powerful tool for precise SM tests.
  • These methods minimize signal loss in rare tauonic modes.
  • Improved LFU measurements can enhance the search for new physics beyond the Standard Model.