Measurement of the Muonic Branching Fractions of the Narrow Upsilon Resonances

G S Adams,P Naik,D T Gong,S W Gray,R Poling,D Riley,K K Gan,B K Heltsley,V Potlia,B Gittelman,H Muramatsu,O Dorjkhaidav,G D Gollin,D L Kreinick,R Nandakumar,D Urner,D Cinabro,K K Seth,C Cawlfield,C Sedlack,J E Duboscq,R A Briere,J Urheim,M R Shepherd,B W Lang,V Pavlunin,K W Edwards,H Stoeck,I Karliner,L Fields,J Kandaswamy,V Savinov,S Blusk,S B Athar,B I Eisenstein,E I Shibata,B Sanghi,R Mountain,S E Csorna,R Ehrlich,A H Mahmood,H Mahlke-Krüger,G Tatishvili,Z Metreveli,P Rubin,R Gray,M Weinberger,M E Watkins,C S Park,T E Coan,H Schwarthoff,D Hertz,J Napolitano,A J Sadoff,K Y Gao,A Bornheim,R S Galik,D L Hartill,S P Pappas,I Danko,N Lowrey,D Peterson,D G Cassel,D M Asner,J J Thaler,R Sia,L Hsu,W Park,D Cronin-Hennessy,C J Stepaniak,F Liu,S Mehrabyan,J B Thayer,E H Thorndike,M Cravey,N Menaa,C Boulahouache,J Pivarski,M Chasse,E Dambasuren,M Dubrovin,G Bonvicini,L Breva-Newell,T Wilksen,James S Williams ,G P Chen,P U E Onyisi,S Stone,S Dytman ,Jonathan L Rosner ,A López ,T O Meyer,K Arms,M Selen,M Artuso,S Z Li,D H Miller,J Wiss,N Adam ,J Muêller ,A Rýd ,G S Huang,A Smith,T Skwarnicki,J Alexander ,R Patel,T Ferguson,J P Cummings,J E Ramirez Vargas ,I P J Shipsey,J Ernst,R Stroynowski,Y Kubota,D Kim,P Zweber,J Butt,A J Weinstein,Z Li,J R Patterson,J G Thayer,K Zhang,Y S Gao,W Sun ,H Vogel,P Avery,R Redjimi,L K Gibbons ,K M Ecklund,J C Wang,A Tomaradze,K Berkelman,C D Jones,H Méndez ,В Е Кузнецов ,D Besson,J Yelton,A W Scott

doi:10.1103/physrevlett.94.012001

Measurement of the Muonic Branching Fractions of the Narrow Upsilon Resonances

G S Adams, P Naik + Show 135 more

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https://doi.org/10.1103/physrevlett.94.012001

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#Upsilon Resonances #Branching Fractions + Show 8 more

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Abstract

The decay branching fractions of the three narrow Upsilon resonances to mu(+)mu(-) have been measured by analyzing about 4.3 fb(-1) e(+)e(-) data collected with the CLEO III detector. The branching fraction B(Upsilon(1S)-->mu(+)mu(-))=(2.49+/-0.02+/-0.07)% is consistent with the current world average, but B(Upsilon(2S)-->mu(+)mu(-))=(2.03+/-0.03+/-0.08)% and B(Upsilon(3S)-->mu(+)mu(-))=(2.39+/-0.07+/-0.10)% are significantly larger than prior results. These new muonic branching fractions imply a narrower total decay width for the Upsilon(2S) and Upsilon(3S) resonances and lower other branching fractions that rely on these decays in their determination.

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