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Photon transitions in Upsilon(2S) and Upsilon(3S) decays |
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| Authors: | Artuso M Boulahouache C Blusk S Butt J Dambasuren E Dorjkhaidav O Li J Menaa N Mountain R Muramatsu H Nandakumar R Redjimi R Sia R Skwarnicki T Stone S Wang J C Zhang K Csorna S E Bonvicini G Cinabro D Dubrovin M Bornheim A Pappas S P Weinstein A J Rosner J L Briere R A Chen G P Ferguson T Tatishvili G Vogel H Watkins M E Adam N E Alexander J P Berkelman K Cassel D G Crede V Duboscq J E Ecklund K M Ehrlich R Fields L Galik R S Gibbons L Gittelman B Gray R Gray S W Hartill D L Heltsley B K Hertz D Hsu L Jones C D Kandaswamy J Kreinick D L Kuznetsov V E Mahlke-Krüger H Meyer T O Onyisi P U E |
| Affiliation: | Syracuse University, Syracuse, New York 13244, USA. |
| Abstract: | We have studied the inclusive photon spectra in Upsilon(2S) and Upsilon(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) --> gammachi(bJ)(1P) and Upsilon(3S) --> gammachi(bJ)(2P) (J = 0, 1, 2). We measure the rate for a rare E1 transition Upsilon(3S) --> gammachi(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. |
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