Photon transitions in Upsilon(2S) and Upsilon(3S)

Abstract

We have studied the inclusive photon spectra in Upsilon(2S) and Υ(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 chi_bJ(1P) and Upsilon(3S)->gamma chi_bJ(2P) J=0,1,2. We measure the rate for a rare E1 transition Upsilon(3S)->gamma chi_b0(1P) for the first time. We also set upper limits on the rates for the hindered magnetic dipole (M1) transitions to the eta_b(1S) and eta_b(2S) states.

10 pages postscript,also available through http://www.lns.cornell.edu/public/CLNS/2004/, submitted to PRL

References in corpus (3)

• Big Bang Nucleosynthesis (in "The Review of Particle Properties" 2004)
• Photon Transitions in ψ(2S) Decays to χ_{cJ}(1P) and η_c(1S)
• Measurement of the Muonic Branching Fractions of the Narrow Upsilon Resonances

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