Search for rare and forbidden eta(') decays

R A Briere,H Krieg,E Johnson,A H Mahmood,K K Gan,S E Csorna,C Plager,R J Morrison,G J Zhou,E Von Toerne,W T Ford,G Bonvicini,E I Shibata,M Dickson,G Eigen,A L Lyon,D L Hartill,R Janicek,D Coppage,C Gwon,T Hart,F Blanc,P S Drell,N Menon,A Eppich,S J Richichi,J E Duboscq,T Bergfeld,I Narsky,B I Eisenstein,G C Moneti,S Prell,P Skubic,J Lorenc,M M Zoeller,P I Hopman,A I Rubiera,P Pomianowski,R Ayad,E M Potter,D Riley,V Boisvert,S Chan,T S Hill,P M Patel,J Roy,B Valant-Spaight,Y Li,S Schrenk,C Bebek,I Karliner,E Nordberg,T K Nelson,P Gaidarev,R Mountain,S Von Dombrowski,A Anastassov,H Marsiske,N B Mistry,J J Thaler,K Honscheid,R M Hans,R S Galik,D Peterson,H Kagan,T E Coan,V Savinov,R Godang,T E Browder,N Kwak,T Riehle,H Schwarthoff,J Urheim,G E Gladding,M A Marsh,M Bishai,I C Lai,B E Berger,J Gronberg,E Dambasuren,M Lohner,D G Cassel,E H Thorndike,G D Gollin,J G Smith,D Cinabro,S B Athar,R Mahapatra,G Masek,S Kotov,C R Ng,H P Paar,B Gittelman,C Sedlack,J W Hinson,R Ammar,K Kinoshita,S Schuh,A J Sadoff,B K Heltsley,K W Edwards,D Ugolini,S Ahmed,R Poling,R Ehrlich,D L Kreinick,K Lingel,P G Thies,M S Alam,S W Gray,V V Frolov,D M Asner,D J Lange,J Yelton ,S Anderson ,J L Rodriguez ,I Kravchenko ,J Alexander ,D E Jaffe ,A J S Smith ,C D Jones ,M Palmer ,A Undrus ,R Stroynowski ,J C Wang ,J G Thayer ,A Warburton ,J Richman ,R C Baker ,Xiang Zhou ,G Brandenburg ,T O Meyer ,K M Ecklund ,E Lipeles ,T Lee ,I Korolkov ,S Timm ,M Artuso ,A V Gritsan ,T Włodek ,R Kass ,R Davis ,S Chen ,B H Behrens ,A Bean ,J P Zheng ,F R Wappler ,L Jian ,K W Mclean ,F Würthwein ,C Jessop ,A Titov ,Y S Gao ,Justin Williams ,Y J Kwon ,A Ershov ,G Majumder ,M Śchmidtler ,Y Maravin ,J Ernst ,P Baringer ,V Fadeyev ,A Shapiro ,S J Lee ,D Besson ,L P Perera ,W Sun ,Y Kubota ,X Zhao ,H Severini ,S Köpp ,A J Weinstein ,A Foland ,K Berkelman ,T Skwarnicki ,P Avery ,G H A Viehhauser ,J R Patterson ,J Lee ,J Wu ,D Y.-J Kim ,D H Miller ,M Selen ,J Ye ,L K Gibbons ,I P J Shipsey ,S Márka ,Richard Wilson ,M B Spencer ,Ling Liu ,S Stone ,C Prescott ,J E Fast ,M Saleem ,Z Z Xu ,R Greene ,H Yamamoto ,V Sharma ,Y Liu ,A Wolf ,M Perl ,J J O’neill ,D A Roberts

doi:10.1103/physrevlett.84.26

Search for rare and forbidden eta(') decays

R A Briere, H Krieg + Show 201 more

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https://doi.org/10.1103/physrevlett.84.26

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Journal: Physical review letters	Publication Date: Jan 3, 2000
Citations: 24

Affiliation: Carnegie Mellon University, University of Colorado Boulder, University of Illinois Urbana-Champaign, University at Albany, State University of New York, The Ohio State University, Vanderbilt University, University of California, Santa Barbara, Wayne State University, Purdue University West Lafayette, Cornell University, California Institute of Technology, University of Rochester, Institute of Particle Physics, McGill University, University of Kansas, University of Oklahoma, Southern Methodist University, Syracuse University, University of California, San Diego, University of Florida, Virginia Tech, University of Hawaiʻi at Mānoa, Stanford University, SLAC National Accelerator Laboratory, Stanford Synchrotron Radiation Lightsource, University of Minnesota, Ithaca College, Carleton University, Harvard University Press

#Cornell Electron Storage Ring #Hadronic Events + Show 8 more

Abstract
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Abstract

We have searched for rare and forbidden decays of the eta(') meson in hadronic events at the CLEO II detector. The search is conducted on 4.80 fb(-1) of e(+)e(-) collisions at 10.6 GeV center-of-mass energy at the Cornell Electron Storage Ring. We find no signals, and set 90% confidence level upper limits of their branching fractions: B(eta(')-->e(+)e(-)eta)<2.4x10(-3), B(eta(')-->e(+)e(-)pi(0))<1. 4x10(-3), B(eta(')-->e(+)e(-)gamma)<0.9x10(-3), and B(eta(')-->e&mgr;)<4.7x10(-4). We also fit the matrix element of the eta(')-->pi(+)pi(-)eta Dalitz plot with the parametrization |M|(2) = A|1+alphay|(2), where y is a linear function of the kinetic energy of the eta, and find Re (alpha) = -0.021+/-0.025.

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