New Upper Limit on the Decay Eta->E(+)E(-)

TE Browder,F Li,Y Li,JL Rodriguez,T Bergfeld,BI Eisenstein,J Ernst,GE Gladding,GD Gollin,RM Hans,E Johnson,I Karliner,MA Marsh,M Palmer,M Selen,JJ Thaler,KW Edwards,A Bellerive,R Janicek,DB MacFarlane,KW McLean,PM Patel,AJ Sadoff,R Ammar,P Baringer,A Bean,D Besson,D Coppage,C Darling,R Davis,N Hancock,S Kotov,I Kravchenko,N Kwak,S Anderson,Y Kubota,M Lattery,SJ Lee,JJ ONeill,S Patton,R Poling,T Riehle,V Savinov,A Smith,MS Alam,SB Athar,Z Ling,AH Mahmood,H Severini,S Timm,F Wappler,A Anastassov,S Blinov,JE Duboscq,KD Fisher,D Fujino,KK Gan,T Hart,K Honscheid,H Kagan,R Kass,J Lee,MB Spencer,M Sung,A Undrus,R Wanke,A Wolf,MM Zoeller, B Nemati,SJ Richichi,WR Ross,P Skubic,M Bishai,J Fast, E Gerndt,JW Hinson,N Menon,DH Miller,EI Shibata,IPJ Shipsey,M Yurko,L Gibbons,S Glenn,SD Johnson,Y Kwon,S Roberts,EH Thorndike,CP Jessop,K Lingel,H Marsiske,ML Perl,D Ugolini,R Wang,X Zhou,TE Coan,V Fadeyev,I Korolkov,Y Maravin,I Narsky,V Shelkov,J Staeck,R Stroynowski,I Volobouev,J Ye,M Artuso,A Efimov,F Frasconi,M Cao,M Goldberg,D He,S Kopp,GC Moneti,R Mountain,S Schuh,T Skwarnicki,S Stone, G Vienhauser,X Xing,J Bartelt,SE Csorna,V Jain,S Marka,R Godang,K Kinoshita,IC Lai,P Pomianowski,S Schrenk,G Bonvicini,D Cinabro,R Greene,LP Perera,GJ Zhou,B Barish,M Chadha,S Chan,G Eigen,JS Miller,C OGrady, M Schmidtler,J Urheim,AJ Weinstein,F Wurthwein,DM Asner,DW Bliss,G Masek,HP Paar,S Prell,M Sivertz,V Sharma,J Gronberg,TS Hill,R Kutschke,DJ Lange,S Menary,RJ Morrison,HN Nelson,TK Nelson,C Qiao,JD Richman,D Roberts,A Ryd,MS Witherell,R Balest,BH Behrens,WT Ford,H Park,J Roy,JG Smith,JP Alexander,C Bebek,BE Berger,K Berkelman,K Bloom,DG Cassel,HA Cho,DM Coffman,DS Crowcroft,M Dickson, PS Drell,KM Ecklund,R Ehrlich,R Elia,AD Foland,P Gaidarev,RS Galik,B Gittelman,SW Gray,DL Hartill,BK Heltsley,PI Hopman,J Kandaswamy,PC Kim,DL Kreinick,T Lee, Y Liu,GS Ludwig,J Masui,J Mevissen,NB Mistry,CR Ng,E Nordberg,M Ogg,JR Patterson,D Peterson,D Riley,A Soffer,B ValantSpaight,C Ward,M Athanas,P Avery,CD Jones,M Lohner,C Prescott,J Yelton,J Zheng,G Brandenburg,RA Briere,YS Gao,DYJ Kim,R Wilson,H Yamamoto

Physical review D Particles, fields, gravitation, and cosmology/Physical review D Particles and fields（1997）

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摘要

We have searched for the rare decay of the eta meson eta-->e(+)e(-) using the CLEO II detector. The eta's were produced in e(+)e(-) collisions with 10 GeV center-of-mass energy at the Cornell Electron Storage Ring (CESR). We find with 90% confidence the upper limit on the branching fraction B(eta-->e(+)e(-))<7.7x10(-5). The application of conventional elementary particle theory to this decay predicts a branching fraction of about 10(-9).

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