Ask a Question

Prefer a chat interface with context about you and your work?

First Observations of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="italic">ϒ</mml:mi><mml:mo>(</mml:mo><mml:mn>1</mml:mn><mml:mi mathvariant="italic">S</mml:mi><mml:mo>)</mml:mo><mml:mi /><mml:mo>→</mml:mo><mml:mi /><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="italic">γ</mml:mi><mml:mi mathvariant="italic">π</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="…

First Observations of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="italic">ϒ</mml:mi><mml:mo>(</mml:mo><mml:mn>1</mml:mn><mml:mi mathvariant="italic">S</mml:mi><mml:mo>)</mml:mo><mml:mi /><mml:mo>→</mml:mo><mml:mi /><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="italic">γ</mml:mi><mml:mi mathvariant="italic">π</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="…

We report on a study of exclusive radiative decays of the $\ensuremath{\Upsilon}(1S)$ resonance collected with the CLEO II detector operating at the Cornell Electron Storage Ring. We present the first observation of the radiative decays $\ensuremath{\Upsilon}(1S)\ensuremath{\rightarrow}\ensuremath{\gamma}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ and $\ensuremath{\Upsilon}(1S)\ensuremath{\rightarrow}\ensuremath{\gamma}{\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0}$. For the dipion mass regime ${m}_{\ensuremath{\pi}\ensuremath{\pi}}&gt;1.0\phantom{\rule{0ex}{0ex}}\mathrm{GeV}$, we obtain $B(\ensuremath{\Upsilon}(1S)\ensuremath{\rightarrow}\ensuremath{\gamma}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}})\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}(6.3\ifmmode\pm\else\textpm\fi{}1.2\ifmmode\pm\else\textpm\fi{}1.3)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5}$ and $B(\ensuremath{\Upsilon}(1S)\ensuremath{\rightarrow}\ensuremath{\gamma}{\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0})\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}(1.7\ifmmode\pm\else\textpm\fi{}0.6\ifmmode\pm\else\textpm\fi{}0.3)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5}$.