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Area of Science:

  • High Energy Physics
  • Particle Physics
  • Quantum Chromodynamics

Background:

  • The Standard Model of particle physics describes fundamental particles and forces.
  • Baryonic decays of beauty mesons offer a unique window into new physics phenomena.
  • The LHCb experiment at CERN collects vast amounts of data from proton-proton collisions.

Purpose of the Study:

  • To report the first observation of the baryonic decay B_{s}^{0}→pΛ[over ¯]K^{-}.
  • To measure the branching fraction of this decay mode.
  • To search for potential deviations from the Standard Model predictions.

Main Methods:

  • Analysis of proton-proton collision data collected by the LHCb experiment at 7 and 8 TeV.
  • Selection of signal events corresponding to the B_{s}^{0}→pΛ[over ¯]K^{-} decay channel.
  • Statistical analysis to determine the significance of the observation and measure the branching fraction.

Main Results:

  • First observation of the baryonic decay B_{s}^{0}→pΛ[over ¯]K^{-}.
  • Measured branching fraction B(B_{s}^{0}→pΛ[over ¯]K^{-})+B(B_{s}^{0}→p[over ¯]ΛK^{+}) = [5.46±0.61±0.57±0.50(B)±0.32(f_{s}/f_{d})]×10^{-6}.
  • Uncertainties include statistical, systematic, normalization, and f_{s}/f_{d} ratios.

Conclusions:

  • The observation of this baryonic decay provides crucial data for theoretical models.
  • This finding opens new avenues for exploring New Physics beyond the Standard Model.
  • Further studies with increased luminosity will improve precision and search for related decay modes.