Measurements of the branching fraction ratio B(ϕ → µ +µ −)/B(ϕ → e +e −) with charm meson decays
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Author(s)
Aaij, R.
Abdelmotteleb, A. S. W.
Abellan Beteta, C.
Abudinén, F.
Ackernley, T.
Adeva, B.
Adinolfi, M.
Adlarson, P.
Agapopoulou, C.
Aidala, C. A.
Date Issued
May 24, 2024
Journal
Journal of High Energy Physics
Publisher
Springer Science and Business Media LLC
Citation
The LHCb collaboration., Aaij, R., Abdelmotteleb, A.S.W. et al. Measurements of the branching fraction ratio (𝜙→𝜇+𝜇−)/(𝜙→e+e−) with charm meson decays. J. High Energ. Phys. 2024, 293 (2024).
Version
Final published version
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 Rs
ϕπ and Rd
ϕπ, 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.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1007/jhep05(2024)293
