Measurements of the branching fraction ratio B(ϕ → µµ)/B(ϕ → e+ e) with charm meson decays

LHCb Collaboration

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Abstract

Measurements of the branching fraction ratio B(ϕ → µ+ µ)/B(ϕ → e+ e) with D+s → π+ ϕ and D+ → π+ ϕ decays, denoted Rsϕπ and Rdϕπ, are presented. The analysis is performed using a dataset corresponding to an integrated luminosity of 5.4 fb−1 of pp collision data collected with the LHCb experiment. The branching fractions are normalised with respect to the B+ → K+J/ψ(→ e+ e) and B+ → K+J/ψ(→ µ+ µ) decay modes. The combination of the results yields

Rϕπ = 1.022 ± 0.012 (stat) ± 0.048 (syst).

The result is compatible with previous measurements of the ϕ → ℓ+ branching fractions and predictions based on the Standard Model.
Original languageEnglish
Article number293
Number of pages23
JournalJHEP
Volume2024
Issue number5
DOIs
Publication statusPublished - 24 May 2024

Keywords

  • B Physics
  • Branching fraction
  • Charm Physics
  • Hadron-Hadron Scattering

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