Radiative Decays of the Upsilon(1S) to a Pair of Charged Hadrons
S. B. Athar, CLEO Collaboration
Abstract
Using data obtained with the CLEO~III detector, running at the Cornell Electron Storage Ring (CESR), 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 pbar.. We present branching ratio measurements for the decay modes Upsilon(1S) to gamma f2(1270), Upsilon(1S) to gamma f2'(1525), and Upsilon(1S) to gamma K+K-; helicity production ratios for f2(1270) and f2'(1525); upper limits for the decay Upsilon(1S) to gamma fJ(2200), with fJ(2220) to pi+ pi-, K+ K-, p pbar; and an upper limit for the decay Upsilon(1S) to gamma X(1860), with X(1860) to gamma p pbar.
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