Branching fractions for $Y(3S) \to \pi^0 h_b$ and $\psi(2S) \to \pi^0 h_c$

J Y Ge,D H Miller, I P J Shipsey,B Xin,G S Adams,J Napolitano,K M Ecklund,J Insler,Hiroyuki Muramatsu,Chan Seok Park, L J Pearson,E H Thorndike,S Ricciardi,Craig E Thomas,M Artuso,S Blusk, R Mountain,T Skwarnicki,S Stone,L M Zhang, G Bonvicini,D Cinabro,A Lincoln,Michael J Smith,Ping Zhou,Jiangang Zhu,P Naik, J Rademacker,D M Asner, K W Edwards, K Randrianarivony,G Tatishvili,R A Briere,H Vogel,P U E Onyisi,Jonathan L Rosner,J P Alexander,D G Cassel,Swadesh K Das,R Ehrlich, L Gibbons,S W Gray,D L Hartill,B K Heltsley,D L Kreinick,V E Kuznetsov,J R Patterson,Dean E Peterson,D Riley, A Ryd,A J Sadoff,Xiaojie Shi,W M Sun, J Yelton,P Rubin,N Lowrey,S Mehrabyan,M Selen,J Wiss,J Libby, M Kornicer,R E Mitchell, C M Tarbert, D Besson, T K Pedlar,D Croninhennessy,J Hietala,S Dobbs,Z Metreveli,K K Seth,A Tomaradze,Tingting Xiao,Lisandra L Martin,Andrew Powell, G Wilkinson

PHYSICAL REVIEW D（2011）

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摘要

Using e(+)e(-) collision data corresponding to 5.88 x 10(6)Y(3S) [25.9 x 10(6)psi (2S)] decays and acquired by the CLEO III [ CLEO- c] detectors operating at the Cornell Electron Storage Ring, we study the singlepion transitions from Y(3S)[psi(2S)] to the respective spin-singlet states h(b[c]). Utilizing only the momentum of suitably selected transition-pi(0) candidates, we obtain the upper limit BY(3S) -> pi(0)h(b)) < 1.2 X 10(-3) at 90% confidence level, and measure B(psi(2S) -> (pi(0)h(c)) = (9.0 +/- 1.5 +/- 1.3) x 10(-4). Signal sensitivities are enhanced by excluding very asymmetric pi(0) -> gamma gamma candidates.

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