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

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Schmelling,  M.       
Division Prof. Dr. James A. Hinton, MPI for Nuclear Physics, Max Planck Society;

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Zavertyaev,  M.       
Division Prof. Dr. James A. Hinton, MPI for Nuclear Physics, Max Planck Society;

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Citation

LHCb Collaboration, Aaij, R., Abdelmotteleb, A. S. W., Abellan Beteta, C., Abudinén, F., Ackernley, T., et al. (2024). Measurements of the branching fraction ratio B(ϕ → μ+μ)/B(ϕ → e+e) with charm meson decays. Journal of High Energy Physics, 2024(5): 293. doi:10.1007/JHEP05(2024)293.


Cite as: https://hdl.handle.net/21.11116/0000-000F-5F74-5
Abstract
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+ branching fractions and predictions based on the Standard Model.