Search for a light Higgs boson in single-photon decays of ${\rm Y}(1S)$ using ${\rm Y}(2S)\to {\pi }^{+}{\pi }^{-}{\rm Y}(1S)$ tagging method

Belle Collaboration, S. Jia, C. P. Shen +210

We search for a light Higgs boson ($A^0$) decaying into a ${\tau }^{+}{\tau }^{-}$ or ${\mu }^{+}{\mu }^{-}$ pair in the radiative decays of ${\rm Y}(1S)$. The production of ${\rm Y}(1S)$ mesons is tagged by $Υ(2S)\to π^+…