Experimental tests of lepton universality inτdecay

A Anastassov,P I Hopman,M Lattery,T E Coan,C Darling,D Fujino,Z Ling,C R Ng,S J Richichi,N Kwak,M Lohner,D S Crowcroft,R Poling,J Mevissen,D Peterson,M A Marsh,R S Galik,R Balest,G Eigen,D G Cassel,P Pomianowski,S Blinov,M Sung,G Bonvicini,I Narsky,H A Cho,R Mountain,G C Moneti,H Park,A Efimov,S B Athar,G S Ludwig,D He,E Gerndt,K Honscheid,N B Mistry,T Bergfeld,R J Morrison,D Coppage,J J Thaler,M Athanas,D Gibaut,D M Asner,M Dickson,B Gittelman,E Nordberg,C Bebek,V Fadeyev,I C Lai,M Ogg,A H Mahmood,J G Smith,M S Alam,S Schuh,B Nemati,R Ehrlich,W R Ross,T E Browder,N Menon,M Chadha,S E Csorna,D Cinabro,D L Kreinick,K Kinoshita,J E Duboscq,T Hart,D L Hartill,G Masek,E I Shibata,R A Briere,K W Edwards,P S Drell,D B Macfarlane,W T Ford,P Skubic,M M Zoeller,J Bartelt,S W Gray,R Godang,V Savinov,B I Eisenstein,S Menary,R Fulton,H Kagan,P Gaidarev,S Roberts,H N Nelson,E Johnson,F Frasconi,N Katayama,B K Heltsley,N Hancock,S Chan,J Kandaswamy,J Gronberg,H P Paar,E H Thorndike,R Elia,K Lingel,W S Brower,M Yurko,R Janicek,K K Gan,D Riley,J W Hinson,A J Sadoff,T K Nelson,Y Li,M Bishai,F Li,S Kotov,M Sivertz,J Masui,J Staeck,P Rankin,R Ammar,I Karliner,J Roy,G D Gollin,B E Berger,D Ugolini,D J Lange,T Riehle,S Schrenk,D M Coffman,J Urheim,R M Hans,P M Patel,G E Gladding,H Marsiske,D Y J Kim ,M Palmer ,M B Spencer ,Y S Gao ,R Greene ,J Ernst ,Y J Kwon ,C P Jessop ,S Patton ,K Bloom ,A Smith ,J Alexander ,Y Mukhin ,J E Fast ,H Severini ,S Stone ,J Ye ,L K Gibbons ,Richard Wilson ,M Gao ,A Bellerive ,J S Miller ,M Selen ,A Bean ,R Wanke ,K D Fisher ,D H Miller ,D A Roberts ,K M Ecklund ,A Freyberger ,F Würthwein ,S Timm ,S Márka ,J Richman ,R Stroynowski ,K W Mclean ,V Shelkov ,I Volobouev ,M Goldberg ,B C Barish ,K Berkelman ,Y Liu ,P C Kim ,A Wolf ,Daniel W Bliss ,J R Patterson ,P Baringer ,I P J Shipsey ,A Foland ,S Anderson ,S D Johnson ,G H A Viehhauser ,A Rýd ,M Śchmidtler ,J J O’neill ,J Yelton ,A Undrus ,I Korolkov ,C Prescott ,A J Weinstein ,X Xing ,C P O’grady ,T Lee ,R Wang ,R Kutschke ,Y Maravin ,C P Ward ,R Kass ,R Davis ,C F Qiao ,J L Rodriguez ,B H Behrens ,S B Yang ,P Avery ,Y Kubota ,M S Witherell ,G Brandenburg ,M Artuso ,K Cho ,S Köpp ,A Soffer ,Xiang Zhou ,L P Perera ,V Jain ,C D Jones ,H Yamamoto ,V Sharma ,T Skwarnicki ,I Kravchenko ,J Lee ,J P Zheng ,S F Schaffner ,M Perl ,D Besson ,M Wood ,F R Wappler

doi:10.1103/physrevd.55.2559

A Anastassov, P I Hopman + Show 224 more

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https://doi.org/10.1103/physrevd.55.2559

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Journal: Physical Review D	Publication Date: Mar 1, 1997
Citations: 29	License type: other-oa

Affiliation: The Ohio State University

Abstract

The branching fractions for τ→eνντ, μνντ, and hντ are measured using data collected with the CLEO detector at the CESR e+e− collider: Be=0.1776±0.0006±0.0017, Bμ=0.1737±0.0008±0.0018, and Bh=0.1152±0.0005±0.0012, where the first error is statistical, the second systematic, and h refers to either a charged π or K. Also measured is the τ mass, mτ=(1778.2±1.4) MeV. Lepton universality is affirmed by the relative branching fractions (Bμ/Be=0.9777±0.0063±0.0087, Bh/Be=0.6484±0.0041±0.0060) and the charged-current gauge coupling-constant ratios (gμ/ge=1.0026±0.0055, gτ/gμ=0.9990±0.0098). The τ mass result may be recast as a τ neutrino mass limit, mντ<60 MeV at 95% C.L.Received 6 November 1996DOI:https://doi.org/10.1103/PhysRevD.55.2559©1997 American Physical Society

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