Search for axion production in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>ϒ</mml:mi></mml:math>decay

Abstract

We have searched for decays of the $\ensuremath{\Upsilon}(1S)$ into a single high-energy photon and a noninter-acting long-lived particle, using the CLEO detector at the Cornell Electron Storage Ring. An upper limit of 3 \ifmmode\times\else\texttimes\fi{} ${10}^{\ensuremath{-}4}$ (at 90% confidence level) is obtained for the branching ratio for such decays.