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Area of Science:

  • Particle Physics
  • High Energy Physics
  • Standard Model Physics

Background:

  • Rare B meson decays provide sensitive probes of fundamental physics.
  • The decay B_{s}^{0}→μ^{+}μ^{-} is a key process predicted by the Standard Model.
  • Searches for related decays probe new physics beyond the Standard Model.

Purpose of the Study:

  • To precisely measure the branching fraction and effective lifetime of the B_{s}^{0}→μ^{+}μ^{-} decay.
  • To search for the rare decays B^{0}→μ^{+}μ^{-} and B_{s}^{0}→μ^{+}μ^{-}γ.
  • To test the predictions of the Standard Model and search for new physics phenomena.

Main Methods:

  • Analysis of proton-proton collision data collected by the LHCb detector at 7, 8, and 13 TeV.
  • Application of sophisticated data selection and background rejection techniques.
  • Statistical analysis to extract signal yields, branching fractions, and lifetimes, and set upper limits.

Main Results:

  • The branching fraction B(B_{s}^{0}→μ^{+}μ^{-}) was measured to be (3.09_{-0.43-0.11}^{+0.46+0.15})×10^{-9}.
  • The effective lifetime τ(B_{s}^{0}→μ^{+}μ^{-}) was measured to be 2.07±0.29±0.03 ps.
  • Upper limits were set for B^{0}→μ^{+}μ^{-} (<2.6×10^{-10}) and B_{s}^{0}→μ^{+}μ^{-}γ (<2.0×10^{-9}).

Conclusions:

  • The measured properties of B_{s}^{0}→μ^{+}μ^{-} are in excellent agreement with Standard Model predictions.
  • The stringent upper limits on B^{0}→μ^{+}μ^{-} and B_{s}^{0}→μ^{+}μ^{-}γ decays constrain new physics scenarios.
  • This study contributes to the precise testing of the Standard Model in the flavor sector.