Dielectron Widths Of The Upsilon(1s,2s,3s) Resonances

Jl Rosner,Ne Adam,Jp Alexander,K Berkelman,Dg Cassel,Je Duboscq,Km Ecklund,R Ehrlich,L Fields,Rs Galik,L Gibbons,R Gray,Sw Gray,Dl Hartill,Bk Heltsley,D Hertz,Cd Jones,J Kandaswamy,Dl Kreinick,Ve Kuznetsov, H Mahlke-Kruger,To Meyer,Pue Onyisi,Jr Patterson,D Peterson,Ea Phillips,J Pivarski,D Riley,A Ryd,Aj Sadoff,H Schwarthoff,X Shi,S Stroiney,Wm Sun,T Wilksen,M Weinberger,Sb Athar,P Avery,L Breva-Newell,R Patel,V Potlia,H Stoeck,J Yelton,P Rubin,C Cawlfield,Bi Eisenstein,I Karliner,D Kim,N Lowrey,P Naik,C Sedlack,M Selen,Ej White,J Wiss,Mr Shepherd,D Besson,Tk Pedlar,D Cronin-Hennessy,Ky Gao,Dt Gong,J Hietala,Y Kubota,T Klein,Bw Lang,R Poling,Aw Scott,A Smith,S Dobbs,Z Metreveli,Kk Seth,A Tomaradze,P Zweber,J Ernst,K Arms,H Severini,Sa Dytman,W Love,S Mehrabyan,V Savinov,O Aquines,Z Li,A Lopez,H Mendez,J Ramirez,Gs Huang,Dh Miller,V Pavlunin,B Sanghi,Ipj Shipsey,B Xin,Gs Adams,M Anderson,Jp Cummings,I Danko,J Napolitano,Q He,J Insler,H Muramatsu,Cs Park,Eh Thorndike,Te Coan,Ys Gao,F Liu,R Stroynowski,M Artuso,S Blusk,J Butt,J Li,N Menaa,R Mountain,S Nisar,K Randrianarivony,R Redjimi,R Sia,T Skwarnicki,S Stone,Jc Wang,K Zhang,Se Csorna,G Bonvicini,D Cinabro,M Dubrovin,A Lincoln,Dm Asner,Kw Edwards,Ra Briere,J Chen,T Ferguson,G Tatishvili,H Vogel,Me Watkins

PHYSICAL REVIEW LETTERS（2006）

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Abstract

We determine the dielectron widths of the Upsilon(1S), Upsilon(2S), and Upsilon(3S) resonances with better than 2% precision by integrating the cross section of e(+)e(-)->Upsilon over the e(+)e(-) center-of-mass energy. Using e(+)e(-) energy scans of the Upsilon resonances at the Cornell Electron Storage Ring and measuring Upsilon production with the CLEO detector, we find dielectron widths of 1.252 +/- 0.004(sigma(stat))+/- 0.019(sigma(syst)) keV, 0.581 +/- 0.004 +/- 0.009 keV, and 0.413 +/- 0.004 +/- 0.006 keV for the Upsilon(1S), Upsilon(2S), and Upsilon(3S), respectively.

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