Search for Invisible Decays of the Upsilon(1S) Resonance P Rubin , C Cawlfield , B I Eisenstein , I Karliner , D Kim , N Lowrey , P Naik , M Selen , E J White , J Wiss , R E Mitchell , M R Shepherd , D Besson , T K Pedlar , D Croninhennessy , K Y Gao , J Hietala , Y Kubota , Teri E Klein , B W Lang , R Poling , A W Scott , A J S Smith , P Zweber , S Dobbs , Z Metreveli , K K Seth , A Tomaradze , J Ernst , K M Ecklund , H Severini , W A Love , V Savinov , O Aquines , Zhuang Li , A Lopez , S Mehrabyan , H Mendez , Jorge Ramirez , G S Huang , D H Miller , V Pavlunin , B Sanghi , I P J Shipsey , B Xin , G S Adams , M Anderson , J P Cummings , I Danko , D Hu , B Moziak , J Napolitano , Qin He , J Insler , H Muramatsu , C S Park , E H Thorndike , F Yang , T E Coan , Y S Gao , M Artuso , S Blusk , J Butt , J Li , N Menaa , R Mountain , S Nisar , K Randrianarivony , R Sia , T Skwarnicki , S Stone , J C Wang , K Zhang , G Bonvicini , D Cinabro , M S Dubrovin , A Lincoln , D M Asner , K W Edwards , R A Briere , T Ferguson , G Tatishvili , H Vogel , M E Watkins , Jonathan L Rosner , Nadia Adam , J P Alexander , D G Cassel , J E Duboscq , R Ehrlich , L Fields , R S Galik , L Gibbons , R Gray , S W Gray , D L Hartill , B K Heltsley , D Hertz , C D Jones , J Kandaswamy , D L Kreinick , V E Kuznetsov , H Mahlkekruger , P U E Onyisi , J R Patterson , Dean E Peterson , J Pivarski , David E Riley , A Ryd , A J Sadoff , H Schwarthoff , Xin Shi , S Stroiney , W M Sun , T Wilksen , S B Athar , Rakesh P Patel , V Potlia , J Yelton PHYSICAL REVIEW D（2007）
摘要
We present a measurement of the branching fraction of invisible Y(1S) decays, using 1.2 fb(-1) of data collected at the Y(2S) resonance with the CLEO III detector at CESR. After subtracting expected backgrounds from events that pass selection criteria for invisible Y(1S) decay in Y(2S) -> pi(+) pi(-) Y(1S), we deduce a 90% C. L. upper limit of B[Y(1S) -> invisible] < 0.39%.
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关键词
data collection, elementary particles, branching ratio
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