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Observation of the decay.

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The CMS experiment observed the rare B meson decay for the first time using proton-proton collision data. This finding provides new insights into fundamental particle physics and rare B meson decays.

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Area of Science:

  • High Energy Physics
  • Particle Physics
  • Hadron Collider Physics

Background:

  • Understanding the Standard Model of particle physics relies on precise measurements of particle decays.
  • Rare B meson decays offer sensitive probes of new physics beyond the Standard Model.
  • Previous searches have not yet established the observation of the decay.

Purpose of the Study:

  • To report the first observation of the decay.
  • To measure the relative branching fraction of the decay with respect to the decay.

Main Methods:

  • Analysis of proton-proton collision data collected by the CMS experiment at the Large Hadron Collider.
  • Utilizing an integrated luminosity of .
  • Statistical analysis to establish the significance of the observed decay.

Main Results:

  • The decay has been observed for the first time with a statistical significance exceeding 5 standard deviations.
  • The relative branching fraction was measured to be .

Conclusions:

  • The observation of the decay adds a new decay channel to the B meson system.
  • The measured branching fraction provides crucial data for theoretical models and searches for new physics.