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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.
  • Understanding meson decays provides insights into fundamental interactions.
  • Previous measurements lacked precision in branching fraction ratios.

Purpose of the Study:

  • To observe and measure the branching fraction ratios of B0 and Bs0 meson decays.
  • To provide precise measurements for the first time.
  • To test predictions of the Standard Model and Quantum Chromodynamics.

Main Methods:

  • Analysis of proton-proton collision data collected by the CMS experiment at the LHC.
  • Utilizing data from 2017 and 2018 with a specific integrated luminosity.
  • Statistical analysis to achieve significances exceeding 5 standard deviations for the observed decays.

Main Results:

  • Observation of B0 and Bs0 meson decays with high statistical significance.
  • First-time measurement of branching fraction ratios: B(B0 -> J/psi phi) / B(Bs0 -> J/psi phi) = 0.0448 +/- 0.0006 (stat) +0.0005/-0.0004 (syst) +/- 0.0004 (lumi) +/- 0.0005 (prod).
  • Measurement of B(B0 -> J/psi K*) / B(Bs0 -> J/psi phi) = 0.055 +/- 0.001 (stat) +0.001/-0.001 (syst) +/- 0.001 (lumi) +/- 0.001 (prod).

Conclusions:

  • The observed decays and measured ratios provide crucial data for particle physics.
  • These results offer new constraints for theoretical models in Quantum Chromodynamics.
  • Further analysis can refine understanding of heavy quarkonium decays.