Measurement of the ηb(1S) mass and the branching fraction for Υ(3S)→γηb(1S)
- Bonvicini, G
- Cinabro, D
- Lincoln, A
- Smith, MJ
- Zhou, P
- Zhu, J
- Naik, P
- Rademacker, J
- Asner, DM
- Edwards, KW
- Reed, J
- Robichaud, AN
- Tatishvili, G
- White, EJ
- Briere, RA
- Vogel, H
- Onyisi, PUE
- Rosner, JL
- Alexander, JP
- Cassel, DG
- Ehrlich, R
- Fields, L
- Galik, RS
- Gibbons, L
- Gray, SW
- Hartill, DL
- Heltsley, BK
- Hunt, JM
- Kreinick, DL
- Kuznetsov, VE
- Ledoux, J
- Mahlke-Krüger, H
- Patterson, JR
- Peterson, D
- Riley, D
- Ryd, A
- Sadoff, AJ
- Shi, X
- Stroiney, S
- Sun, WM
- Yelton, J
- Rubin, P
- Lowrey, N
- Mehrabyan, S
- Selen, M
- Wiss, J
- Kornicer, M
- Mitchell, RE
- Shepherd, MR
- Tarbert, CM
- Besson, D
- Pedlar, TK
- Xavier, J
- Cronin-Hennessy, D
- Gao, KY
- Hietala, J
- Poling, R
- Zweber, P
- Dobbs, S
- Metreveli, Z
- Seth, KK
- Tan, BJY
- Tomaradze, A
- Brisbane, S
- Libby, J
- Martin, L
- Powell, A
- Spradlin, P
- Thomas, C
- Wilkinson, G
- Mendez, H
- Ge, JY
- Miller, DH
- Shipsey, IPJ
- Xin, B
- Adams, GS
- Hu, D
- Moziak, B
- Napolitano, J
- Ecklund, KM
- Insler, J
- Muramatsu, H
- Park, CS
- Thorndike, EH
- Yang, F
- Artuso, M
- Blusk, S
- Khalil, S
- Mountain, R
- Randrianarivony, K
- Skwarnicki, T
- Wang, JC
- Zhang, LM
Publication date
February 2010
DOI Publisher
American Physical Society (APS) Journal
Physical Review DAbstract
We report evidence for the ground state of bottomonium, ηb(1S), in the radiative decay Υ(3S)→γηb in e+e- annihilation data taken with the CLEO III detector. Using 6×106 Υ(3S) decays, and assuming Γ(ηb)=10±5MeV/c2, we obtain B(Υ(3S)→γηb)=(7.1±1.8±1.3)×10 -4, where the first error is statistical and the second is systematic. The statistical significance is ∼4σ. The mass is determined to be M(ηb)=9391.8±6.6±2.0MeV/c2, which corresponds to the hyperfine splitting ΔMhf(1S)b=68.5±6.6±2.0MeV/c2. Using 9×106 Υ(2S) decays, we place an upper limit on the corresponding Υ(2S) decay, B(Υ(2S)→γηb)<8. 4×10-4 at 90% confidence level. © 2010 The American Physical Society
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