Search for di-muon decays of a low-mass Higgs boson in radiative decays of the Υ(1S)

Le résumé fourni par la source

We search for di-muon decays of a low-mass Higgs boson (${A}^{0}$) produced in radiative $\ensuremath{\Upsilon}(1S)$ decays. The $\ensuremath{\Upsilon}(1S)$ sample is selected by tagging the pion pair in the $\ensuremath{\Upsilon}(2S,3S)\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}\ensuremath{\Upsilon}(1S)$ transitions, using a data sample of $92.8\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $\ensuremath{\Upsilon}(2S)$ and $116.8\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $\ensuremath{\Upsilon}(3S)$ events collected by the BABAR detector. We find no evidence for ${A}^{0}$ production and set 90% confidence level upper limits on the product branching fraction $\mathcal{B}(\ensuremath{\Upsilon}(1S)\ensuremath{\rightarrow}\ensuremath{\gamma}{A}^{0})\ifmmode\times\else\texttimes\fi{}\mathcal{B}({A}^{0}\ensuremath{\rightarrow}{\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}})$ in the range of $(0.28\ensuremath{-}9.7)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}$ for $0.212\ensuremath{\le}{m}_{{A}^{0}}\ensuremath{\le}9.20\text{ }\text{ }\mathrm{GeV}/{c}^{2}$. The results are combined with our previous measurements of $\ensuremath{\Upsilon}(2S,3S)\ensuremath{\rightarrow}\ensuremath{\gamma}{A}^{0}$, ${A}^{0}\ensuremath{\rightarrow}{\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}$ to set limits on the effective coupling of the $b$ quark to the ${A}^{0}$.

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