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This study analyzes B meson decays to disentangle short- and long-distance contributions. Results suggest a non-standard short-distance amplitude, differing from Standard Model predictions.

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Area of Science:

  • High Energy Physics
  • Particle Physics
  • Quantum Chromodynamics

Background:

  • Understanding B meson decays is crucial for probing fundamental physics.
  • Distinguishing short- vs. long-distance contributions is a key challenge.

Purpose of the Study:

  • To disentangle short- and long-distance contributions in B meson decays.
  • To independently determine Wilson coefficients and test Standard Model predictions.

Main Methods:

  • Analysis of dilepton invariant mass spectrum data.
  • Employing a dispersive approach to account for long-distance amplitudes from resonances.
  • Independent determination of Wilson coefficients for each helicity amplitude and B meson decay bin.

Main Results:

  • Consistent Wilson coefficient values indicate the absence of additional sizable long-distance contributions.
  • A systematic difference between determined and Standard Model predicted values was observed.

Conclusions:

  • The observed discrepancy supports a hypothesis of a non-standard short-distance amplitude in B meson decays.
  • This finding opens avenues for exploring physics beyond the Standard Model.