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oai:recercat.cat:2445/2220192025-11-21T05:27:04Zcom_2072_1057col_2072_478823col_2072_478904col_2072_478917

Measurements of the branching fraction ratio B(ϕ → µ +µ −)/B(ϕ → e +e −) with charm meson decays Comerma Montells, Albert Garcia Moreno, Paula Garrido Beltrán, Lluís Gioventù, Alessandra Gironella Gironell, Pere Gomez Fernandez, Sergio Graugés Pous, Eugeni Lobo Salvia, Aniol López Huertas, Albert Manera Escalero, Rafel Marin Benito, Carla Mauricio Ferre, Joan Alfonso Albero, Alejandro Vazquez Gomez, Ricardo LHCb Collaboration Física de partícules Leptons (Física nuclear) Hadrons Particle physics Leptons (Nuclear physics) Hadrons 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. 2025-07-04T15:09:44Z 2025-07-04T15:09:44Z 2024 2025-07-04T15:09:44Z info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 1126-6708 https://hdl.handle.net/2445/222019 756550 eng Reproducció del document publicat a: https://doi.org/10.1007/JHEP05(2024)293 Journal of High Energy Physics, 2024, vol. 2024, num.293 https://doi.org/10.1007/JHEP05(2024)293 cc-by (c) Aaij, R. et al., 2024 http://creativecommons.org/licenses/by/4.0/ info:eu-repo/semantics/openAccess 24 p. application/pdf application/pdf Springer Verlag Articles publicats en revistes (Física Quàntica i Astrofísica)