Study of the decays D0KK
J. Alexander,Marina Artuso,C. Bebek,Karl Berkelman,T. E. Browder,D. G. Cassel,Elliott Cheu,D. M. Coffman,Glen D. Crawford,J. W. Dewire,P. S. Drell,R. Ehrlich,B. Gittelman,S. W. Gray,A. M. Halling,D. L. Hartill,B. K. Heltsley,K. Honscheid,J. Kandaswamy,N. Katayama,D. L. Kreinick,J. D. Lewis,G. S. Ludwig,N. B. Mistry,Soumitra Nandi,E. Nordberg,C. O'Grady,D. Peterson,M. Pisharody,D. Riley,M. Sapper,Mats A Selen,A. Silverman,Sheldon Stone,H. Worden,M. Worris,A. J. Sadoff,Paul Avery,D. Z. Besson,L. Garren,John Yelton,K. Kinoshita,F. M. Pipkin,M. Procario,Richard Wilson,J. Wolinski,D. Xiao,Y. Zhu,R. Ammar,Philip Baringer,D. Coppage,P. Haas,M. L. Kelly,N. Kwak,Ha Lam,S. Ro,A. Jawahery,Yuichi Kubota,Janice Nelson,D. Perticone,R. Poling,R. Fulton,T. Jensen,D. R. Johnson,H. Kagan,R. D. Kass,F. Morrow,J. Whitmore,P. Wilson,Daniela Bortoletto,W. Y. Chen,J. Dominick,R. L. McIlwain,D. H. Miller,C. R. Ng,S.F. Schaffner,E. I. Shibata,I. P. J. Shipsey,W. M. Yao,K. Sparks,E. H. Thorndike,Cong Wang,M. S. Alam,I. J. Kim,Wei Li,V. Romero,C. R. Sun,Pu Wang,M. M. Zoeller,M. Goldberg,T. Haupt,N. Horwitz,Vipul Jain,M. D. Mestayer,G. C. Moneti,Yoram Rozen,P. Rubin,Vivek Sharma,T. Skwarnicki,M. Thulasidas Physical Review Letters（1990）
Abstract
Using the CLEO detector we have observed the Cabibbo-suppressed decays {ital D}{sup 0}{r arrow}{ital K}{sup 0}{ital {bar K}0}, {ital K}{sup +}{ital K}{sup {minus}}, and {pi}{sup +}{pi}{sup {minus}}. We determine {ital B}({ital D}{sup 0}{r arrow}{ital K}{sup 0}{ital {bar K}0})= (0.13{sup +0.07}{sub {minus}0.05}{sup +0.02}{sub {minus}0.02})%. Our measurement {ital B}({ital D}{sup 0}{r arrow}{ital K}{sup +}{ital K}{sup {minus}})/{ital B}({ital D}{sup 0}{r arrow}{pi}{sup +}{pi}{sup {minus}})=2.35{plus minus}0.37{plus minus}0.28 represents asubstantial improvement over previous results. We find no evidence for the decay {ital D}{sup 0}{r arrow}{pi}{sup 0}{pi}{sup 0}, and place a 90%-confidence-level upper limit of {ital B}({ital D}{sup 0}{r arrow}{pi}{sup 0}{pi}{sup 0}){lt}0.46%.
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Key words
Quantum Chromodynamics
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