A search for the decay D$^0 \rightarrow \mu^+\mu^-$

J. J. Aubert,C. Benchouk,G. D'Agostini, P. Payre, G. Bassompierre,X. De Bouard, C. Broll,G. Coignet, Y. Declais, J. Favier, M. Maire,E. Nagy,H. Pessard,M. Schneegans,J.M. Thenard,L. Urban,K.H. Becks,J. Drees,A. W. Edwards,H. Forsbach, K. Ham Acher,M. Henckes,Uwe Pietrzyk, W. Stockhausen,H. Wahlen,C. Best,J. Carr,R. W. Clifft,M. C. Edwards,P. R. Norton,Joshua Thompson,I. G. Bird,J.H. Cobb, T. J. Sloan, E. Boehm,W.D. Dau,F.W. Brasse,W. Flauger,J. Gayler, V. Gerhardt,V. Korbel,J. Nassalski,S.C. Brown,G.R. Court, E. Gabathuler,R. Gamet,P.J. Hayman,D. Williams,Stephen Wimpenny,F. Combley,M. Whalley,J. Williamson,J.K. Davies,R.P. Mount,J. McNicholas, M. Villers,W.S.C. Williams, U. Dosselli, C. Goessling,M. Leenen,H.E. Montgomery,A.M. Osborne,M.I. Ferrero,Cristiana Peroni, Amedeo Staiano,J. Haas,Ulrich Landgraf,W. Mohr,K. Moser,K. Rith,H. E. Stier

Physics Letters B（1985）

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Abstract

Abstract μ+μ− pairs have been observed in deep inelastic muon-nucleon scattering and their masses measured with high resolution. No significant signal was observed at the D0 mass. These data allow an upper limit of 3.4 × 10−4 (90% confidence level) to be placed on the branching ratio for the decay mode D0 → μ+μ−.

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Key words

decay d0

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