ausblenden:
Schlagwörter:
B Physics, Branching fraction, Charm Physics, Hadron-Hadron Scattering
MPINP:
LHCb - Abteilung Hinton
Zusammenfassung:
Measurements of the branching fraction ratio B(ϕ → μ+μ−)/B(ϕ → e+e−) with Ds+ → π+ϕ and D+ → π+ϕ decays, denoted Rϕπs and Rϕπd, 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+ℓ− branching fractions and predictions based on the Standard Model.