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

• Published in: Physical review letters 2005-01, Vol.94 (3), p.032001-032001, Article 032001
• Main 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, Patterson, J R, Peterson, D, Pivarski, J, Riley, D, Ryd, A, Sadoff, A J, Schwarthoff, H, Shepherd, M R, Stroiney, S, Sun, W M, Thayer, J G, Urner, D, Wilksen, T, Weinberger, M, Athar, S B, Avery, P, Breva-Newell, L, Patel, R, Potlia, V, Stoeck, H, Yelton, J, Rubin, P, Cawlfield, C, Eisenstein, B I, Gollin, G D, Karliner, I, Kim, D, Lowrey, N, Naik, P, Sedlack, C, Selen, M, Thaler, J J, Williams, J, Wiss, J, Edwards, K W, Besson, D, Pedlar, T K, Cronin-Hennessy, D, Gao, K Y, Gong, D T, Kubota, Y, Lang, B W, Li, S Z, Poling, R
• Format: Article
• Language: English
• ISSN: 0031-9007; 1079-7114
• DOI: 10.1103/PhysRevLett.94.032001

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.