Search for Hadronic Decays of a Light Higgs Boson in the Radiative Decay Υ→γA0

Résumé fourni par la source

We search for hadronic decays of a light Higgs boson (${A}^{0}$) produced in radiative decays of an $\mathit{\ensuremath{\Upsilon}}(2S)$ or $\mathit{\ensuremath{\Upsilon}}(3S)$ meson, $\mathit{\ensuremath{\Upsilon}}\ensuremath{\rightarrow}\ensuremath{\gamma}{A}^{0}$. The data have been recorded by the BABAR experiment at the $\mathit{\ensuremath{\Upsilon}}(3S)$ and $\mathit{\ensuremath{\Upsilon}}(2S)$ center-of-mass energies and include $(121.3\ifmmode\pm\else\textpm\fi{}1.2)\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $\mathit{\ensuremath{\Upsilon}}(3S)$ and $(98.3\ifmmode\pm\else\textpm\fi{}0.9)\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $\mathit{\ensuremath{\Upsilon}}(2S)$ mesons. No significant signal is observed. We set $90%$ confidence level upper limits on the product branching fractions $\mathcal{B}\mathbf{(}\mathit{\ensuremath{\Upsilon}}(nS)\ensuremath{\rightarrow}\ensuremath{\gamma}{A}^{0}\mathbf{)}\mathcal{B}({A}^{0}\ensuremath{\rightarrow}\mathrm{\text{hadrons}})$ ($n=2$ or 3) that range from $1\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}$ for an ${A}^{0}$ mass of $0.3\text{ }\text{ }\mathrm{GeV}/{c}^{2}$ to $8\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5}$ at $7\text{ }\text{ }\mathrm{GeV}/{c}^{2}$.

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