Photon transitions in Upsilon(2S) and Upsilon(3S)
Abstract
We have studied the inclusive photon spectra in Upsilon(2S) and (3S) decays using a large statistics data sample obtained with the CLEO III detector. We present the most precise measurements of electric dipole (E1) photon transition rates and photon energies for Upsilon(2S)->gamma chibJ(1P) and Upsilon(3S)->gamma chibJ(2P) J=0,1,2. We measure the rate for a rare E1 transition Upsilon(3S)->gamma chib0(1P) for the first time. We also set upper limits on the rates for the hindered magnetic dipole (M1) transitions to the etab(1S) and etab(2S) states.
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