Observation ofΥ(2S)→ηΥ(1S)and Search for Related Transitions

Q He,J Hietala,J Kandaswamy,D Cronin-Hennessy,D G Cassel,I Karliner,B W Lang,M R Shepherd,D L Kreinick,B K Heltsley,G Bonvicini,D L Hartill,K Y Gao,K W Edwards,M Dubrovin,S W Gray,K K Seth,V Savinov,D M Asner,N Lowrey,D Mohapatra,P Rubin,S Stroiney,S Nisar,A Powell,C S Park,L Fields,B Moziak,J Napolitano,A Lincoln,J Insler,B I Eisenstein,S B Athar,D Riley,R Ehrlich,D Cinabro,P Naik,E J White,R Poling,S Mehrabyan,T Wilksen,J Libby,G Wilkinson,I Danko,A J Sadoff,B Xin,J E Duboscq,G Tatishvili,H Muramatsu,H Mahlke-Krüger,R S Galik,D Peterson,M E Watkins,G S Adams,T K Pedlar,R Gray,R E Mitchell,T Klein,S Blusk,R A Briere,D Hertz,E H Thorndike,Z Metreveli,R Mountain,K Randrianarivony,James Ledoux ,J Alexander ,J H Rademacker ,F Yang,A W Scott,R Patel,J Reed,L M Zhang,P Zweber,J M Hunt,В Е Кузнецов ,A Tomaradze,H Méndez ,K M Ecklund,S Stone,M Anderson,L M Garcia Martin ,T Ferguson,X Shi,I P J Shipsey,W Sun ,D Besson,Dandan Hu ,J Yelton,S Dobbs,J Wiss,S Khalil,J Li,M Artuso,M Selen,P U E Onyisi,J R Patterson,D H Miller,Y Kubota,H Vogel,J P Cummings,N Sultana,Jun Ge ,L Gibbons,J C Wang,J Xavier ,Jonathan L Rosner ,W A Love ,A Rýd ,T Skwarnicki

doi:10.1103/physrevlett.101.192001

Observation ofΥ(2S)→ηΥ(1S)and Search for Related Transitions

Q He, J Hietala + Show 108 more

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https://doi.org/10.1103/physrevlett.101.192001

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Journal: Physical Review Letters	Publication Date: Nov 3, 2008
Citations: 22

Affiliation: University of Rochester, University of Minnesota, Cornell University, University of Illinois Urbana-Champaign, Indiana University, Wayne State University, Carleton University, Northwestern University, University of Pittsburgh, George Mason University, Syracuse University, University of Oxford, Rensselaer Polytechnic Institute, University of Florida, University of Bristol, Purdue University West Lafayette, Carnegie Mellon University, Luther College

#CLEO Detector #Branching Fraction + Show 5 more

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Abstract

We report the first observation of Upsilon(2S)-->etaUpsilon(1S), with a branching fraction B=(2.1(-0.6)+0.7(stat)+/-0.3(syst)) x 10(-4) and a statistical significance 5.3sigma. Data were acquired with the CLEO III detector at the CESR e+e(-) symmetric collider. This is the first process observed involving a b-quark spin flip. For related transitions, 90% confidence limits in units of 10(-4) are B(Upsilon(2S)-->pi0Upsilon(1S)) < 1.8, B(Upsilon(3S)-->etaUpsilon(1S)) < 1.8, B(Upsilon(3S)-->pi0Upsilon(1S)) < 0.7, and B(Upsilon(3S)-->pi0Upsilon(2S)) < 5.1.

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