Search For B ->Tau Nu And B -> K Nu(Nu)Over-Bar

Te Browder,Y Li,Jl Rodriguez,H Yamamoto,T Bergfeld,Bi Eisenstein,J Ernst,Ge Gladding,Gd Gollin,Rm Hans,E Johnson,I Karliner,Ma Marsh,M Palmer,C Plager,C Sedlack,M Selen,Jj Thaler,J Williams,Kw Edwards,R Janicek,Pm Patel,Aj Sadoff,R Ammar,A Bean,D Besson,R Davis,N Kwak,X Zhao,S Anderson,Vv Frolov,Y Kubota,Sj Lee,R Mahapatra,Jj O'Neill,R Poling,T Riehle,A Smith,Cj Stepaniak,J Urheim,S Ahmed,Ms Alam,Sb Athar,L Jian,L Ling,M Saleem,S Timm,F Wappler,A Anastassov,Je Duboscq,E Eckhart,Kk Gan,C Gwon,T Hart,K Honscheid,D Hufnagel,H Kagan,R Kass,Tk Pedlar,H Schwarthoff,Jb Thayer,E Von Toerne,Mm Zoeller,Sj Richichi,H Severini,P Skubic,A Undrus,S Chen,J Fast,Jw Hinson,J Lee,Dh Miller,Ei Shibata,Ipj Shipsey,V Pavlunin,D Cronin-Hennessy,Al Lyon,Eh Thorndike,Cp Jessop,H Marsiske,Ml Perl,V Savinov,D Ugolini,X Zhou,Te Coan,V Fadeyev,Y Maravin,I Narsky,R Stroynowski,T Wlodek,M Artuso,R Ayad,C Boulahouache,K Bukin,E Dambasuren,S Karamov,G Majumder,Gc Moneti,R Mountain,S Schuh,T Skwarnicki,S Stone,G Viehhauser,Jc Wang,A Wolf,J Wu,S Kopp,Ah Mahmood,Se Csorna,I Danko,Kw Mclean,S Marka,Z Xu,R Godang,K Kinoshita,Ic Lai,S Schrenk,G Bonvicini,D Cinabro,S Mcgee,Lp Perera,Gj Zhou,E Lipeles,Sp Pappas,M Schmidtler,A Shapiro,Wm Sun,Aj Weinstein,F Wurthwein,De Jaffe,G Masek,Hp Paar,Em Potter,S Prell,V Sharma,Dm Asner,A Eppich,Ts Hill,Rj Morrison,Ra Briere,T Ferguson,H Vogel, Be Behrens,K Berkelman,F Blanc,V Boisvert,Dg Cassel,M Dickson,Ps Drell,Km Ecklund,R Ehrlich,Ad Foland,P Gaidarev,L Gibbons,B Gittelman,Sw Gray,Dl Hartill,Bk Heltsley,Pi Hopman,Cd Jones,Dl Kreinick,M Lohner,A Magerkurth,To Meyer,Nb Mistry,E Nordberg,Jr Patterson,D Peterson,D Riley,Jg Thayer,Pg Thies,D Urner,B Valant-Spaight,A Warburton,P Avery,C Prescott,Ai Rubiera,J Yelton,J Zheng,G Brandenburg,A Ershov,Ys Gao,Dyj Kim,R Wilson

PHYSICAL REVIEW LETTERS（2001）

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Abstract

We report results of a search for B --> tau nu in a sample of 9.7 x 10(6) charged B meson decays. We exclusively reconstruct the companion B decay to suppress background. We set an upper limit on the branching fraction B(B --> tau nu) < 8.4 X 10(-4) at 90% confidence level, We also establish B(B+/- --> K+/- nu <(nu )over bar >) < 2.4 X 10(-4) at 90% confidence level.

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Key words

confidence level,elementary particles

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