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Continuing our studies of radiative Upsilon(1S) decays, we report on a searchfor Upsilon to gamma eta and Upsilon to gamma f_{J}(2220) in 61.3 pb^{-1} ofe^{+}e^{-} data taken with the CLEO II detector at the Cornell Electron StorageRing. For the gamma eta search the three decays of the eta meson topi^{+}pi^{-}pi^{0}, pi^{0}pi^{0}pi^{0}, and gamma gamma were investigated. Wefound no candidate events in the two (3\pi)^{0} modes and no significant excessover expected backgrounds in the gamma gamma mode to set a limit on thebranching fraction of B(Upsilon to gamma eta) < 2.1 x 10^{-5} at 90% C.L. Thethree charged two-body final states h h-bar (h = pi^{+}, K^{+}, p) wereinvestigated for f_{J}(2220) production, with one, one, and two events found,respectively. Limits at 90% C.L. of B(\Upsilon to gamma f_{J}) x B(f_{J} to hh-bar) ~ 1.5 x 10^{-5} have been set for each of these modes. We compare ourresults to measurements of other radiative Upsilon decays, to measurements ofradiative J/psi decays, and to theoretical predictions.

physical review. d. particles, fields, gravitation, and cosmology/physical review. d. particles and fields

Further experimental studies of two-body radiative<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Υ</mml:mi></mml:math>decays

Further experimental studies of two-body radiativeΥdecays