Measurements of the branching fraction ratio $\mathcal{B}(\varphi \to {\mu }^{+}{\mu }^{-})/\mathcal{B}(\varphi \to e^{+}{e}^{-})$ with charm meson decays

Abstract

Measurements of the branching fraction ratio $\mathcal{B}(\varphi \to {\mu }^{+}{\mu }^{-})/\mathcal{B}(\varphi \to e^{+}{e}^{-})$ with $D_s^{+}\to {\pi }^{+}\varphi$ and $D^{+}\to {\pi }^{+}\varphi$ decays, denoted $R_{\varphi \pi }^s$ and $R_{\varphi \pi }^d$, are presented. The analysis is performed using a dataset corresponding to an integrated luminosity of 5.4${\mathrm{fb}}^{-1}$ of $pp$ collision data collected with the LHCb experiment. The branching fractions are normalised with respect to the $B^{+}\to K^{+}J/\psi (\to e^{+}{e}^{-})$ and $B^{+}\to K^{+}J/\psi (\to {\mu }^{+}{\mu }^{-})$ decay modes. The combination of the results yields $$R_{\varphi \pi }=1.022\pm 0.012(\mathrm{stat})\pm 0.048(\mathrm{syst}).$$ The result is compatible with previous measurements of the $\varphi \to {\ell }^{+}{\ell }^{-}$ branching fractions and predictions based on the Standard Model.

arXiv commentAll figures and tables, along with any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2023-038.html (LHCb public pages)

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