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Area of Science:

  • Particle Physics
  • High-Energy Physics
  • Quantum Chromodynamics

Background:

  • The B(s)(0) meson is a neutral B meson containing a strange quark.
  • Understanding B meson decays provides insights into the Standard Model of particle physics.
  • Previous studies have explored various B meson decay modes.

Purpose of the Study:

  • To report the first observation of the B(s)(0)→η'η' decay.
  • To measure the branching fraction of this decay mode.
  • To measure charge asymmetries of related B meson decays as control channels.

Main Methods:

  • Analysis of proton-proton collision data collected by the LHCb detector.
  • Utilizing a data sample corresponding to 3.0 fb⁻¹ of integrated luminosity.
  • Statistical analysis to determine signal significance and branching fraction.

Main Results:

  • The B(s)(0)→η'η' decay is observed with a significance of 6.4 standard deviations.
  • The branching fraction is measured as [3.31±0.64(stat)±0.28(syst)±0.12(norm)]×10⁻⁵.
  • Charge asymmetries for B(±)→η'K(±) and B(±)→ϕK(±) are measured as (-0.2±1.3)% and (+1.7±1.3)%, respectively.

Conclusions:

  • The results are consistent with theoretical predictions.
  • This observation contributes to the understanding of rare B meson decays.
  • The measured branching fraction and asymmetries provide valuable data for theoretical models.