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Angular Analysis of the B^{+}→K^{*+}μ^{+}μ^{-} Decay.

R Aaij1, C Abellán Beteta2, T Ackernley3

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Physical Review Letters
|May 7, 2021
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Summary
This summary is machine-generated.

Researchers analyzed B+ decays into K*+ and muon pairs, observing deviations from the Standard Model. These findings, similar to related B0 decays, suggest new physics possibilities and require careful theoretical interpretation.

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Area of Science:

  • High Energy Physics
  • Particle Physics
  • Quantum Chromodynamics

Background:

  • The Standard Model (SM) of particle physics successfully describes fundamental particles and forces.
  • Deviations from SM predictions in B meson decays could indicate the presence of new physics beyond the SM.
  • Previous LHCb analyses of B0→K*0μ+μ- decays have shown tensions with SM expectations.

Purpose of the Study:

  • To perform a comprehensive angular analysis of the B+→K*+μ+μ- decay.
  • To measure the full set of CP-averaged angular observables in intervals of the dimuon invariant mass squared.
  • To investigate potential deviations from SM predictions and compare with results from the isospin-partner B0 decay.

Main Methods:

  • Analysis of 9 fb-1 of pp collision data collected by the LHCb experiment.
  • Measurement of CP-averaged angular observables for the B+→K*+μ+μ- decay.
  • Comparison of experimental results with SM predictions across different dimuon invariant mass squared intervals.

Main Results:

  • The full set of CP-averaged angular observables for B+→K*+μ+μ- has been measured for the first time.
  • Local deviations from Standard Model predictions were observed in certain intervals.
  • These deviations are similar in nature to those previously seen in the B0→K*0μ+μ- decay.

Conclusions:

  • The observed local deviations in B+→K*+μ+μ- decay suggest a potential hint of new physics.
  • The global tension with the SM depends on the chosen theoretical parameters and effective couplings.
  • Further theoretical and experimental investigations are needed to confirm and understand these anomalies.