Radiative Decays of the $\Upsilon$(1S) to a Photon and Two Charged Tracks

Using the CLEO III detector, we report on a new study of exclusive radiative $\Upsilon$(1S) decays into the final states $\gamma\pi^+\pi^-$, $\gamma K^+ K^-$ and $\gamma p \bar{p}$. We present branching ratio and helicity amplitude measurements for the decay modes $\Upsilon(1S) \rightarrow \gamma f_2(1270)$ and $\Upsilon(1S) \rightarrow \gamma f_2'(1525)$, and upper limits for the decay $\Upsilon(1S) \rightarrow \gamma f_J(2200)$ with $f_J(2220) \rightarrow \pi^+\pi^-$, $K^+ K^-$ and $p \bar{p}$.