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Search for di-muon decays of a low-mass Higgs boson in radiative decays of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Υ</mml:mi><mml:mo stretchy="false">(</mml:mo><mml:mn>1</mml:mn><mml:mi>S</mml:mi><mml:mo stretchy="false">)</mml:mo></mml:math>
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 …