Observation of the Cabibbo-suppressed charmed baryon decay Λc+→pφ

J. Alexander,C. Bebek,B. Berger,K. Berkelman,K. Bloom,T. Browder,D. Cassel,H. Cho,D. Coffman,D. Crowcroft,M. Dickson,P. Drell,D. Dumas,R. Ehrlich,R. Elia,P. Gaidarev,M. Garcia-Sciveres,B. Gittelman,S. Gray,D. Hartill,B. Heltsley,S. Henderson,C. Jones,S. Jones,J. Kandaswamy,N. Katayama,P. Kim,D. Kreinick,T. Lee, Y. Liu,G. Ludwig,J. Masui,J. Mevissen,N. Mistry,C. Ng,E. Nordberg,J. Patterson,D. Peterson,D. Riley,A. Soffer,P. Avery,A. Freyberger,K. Lingel, C. Prescott,J. Rodriguez, S. Yang,J. Yelton,G. Brandenburg,D. Cinabro, T. Liu,M. Saulnier,R. Wilson, H. Yamamoto,T. Bergfeld,B. Eisenstein,J. Ernst,G. Gladding, G. Gollin,M. Palmer,M. Selen,J. Thaler,K. Edwards,K. McLean,M. Ogg,A. Bellerive,D. Britton,E. Hyatt,R. Janicek, D. MacFarlane,P. Patel,B. Spaan,A. Sadoff,R. Ammar,P. Baringer,A. Bean,D. Besson,D. Coppage,N. Copty,R. Davis,N. Hancock,S. Kotov,I. Kravchenko,N. Kwak,Y. Kubota,M. Lattery,M. Momayezi,J. Nelson,S. Patton,R. Poling, V. Savinov,S. Schrenk,R. Wang,M. Alam,I. Kim,Z. Ling,A. Mahmood,J. O'Neill, H. Severini,C. Sun,F. Wappler,G. Crawford,R. Fulton,D. Fujino,K. Gan,K. Honscheid, H. Kagan,R. Kass,J. Lee,M. Sung,C. White, A. Wolf,M. Zoeller,X. Fu,B. Nemati,W. Ross,P. Skubic,M. Wood,M. Bishai,J. Fast,E. Gerndt,J. Hinson, T. Miao,D. Miller,M. Modesitt, E. Shibata,I. Shipsey, P. Wang, L. Gibbons,S. Johnson,Y. Kwon,S. Roberts,E. Thorndike,T. Coan,J. Dominick,V. Fadeyev,I. Korolkov,M. Lambrecht,S. Sanghera,V. Shelkov,T. Skwarnicki,R. Stroynowski,I. Volobouev,G. Wei,M. Artuso,M. Gao,M. Goldberg,D. He,N. Horwitz,S. Kopp, G. Moneti,R. Mountain, F. Muheim,Y. Mukhin,S. Playfer,S. Stone, X. Xing,J. Bartelt, S. Csorna,V. Jain,S. Marka, D. Gibaut, K. Kinoshita,P. Pomianowski,B. Barish,M. Chadha,S. Chan,D. Cowen,G. Eigen,J. Miller,C. O'Grady,J. Urheim,A. Weinstein, F. Würthwein,D. Asner,M. Athanas,D. Bliss,W. Brower,G. Masek, H. Paar, J. Gronberg,C. Korte,R. Kutschke,S. Menary,R. Morrison,S. Nakanishi,H. Nelson, T. Nelson,C. Qiao,J. Richman,D. Roberts, A. Ryd,H. Tajima,M. Witherell,R. Balest,K. Cho,W. Ford, M. Lohner,H. Park,P. Rankin, J. Smith

PHYSICAL REVIEW D（1996）

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摘要

We report the observation of the Cabibbo-suppressed decays Lambda(c)(+) --> pK(-)K(+) and Lambda(c)(+) --> p phi using data collected with the CLEO II detector at CESR. The latter mode, observed for the first time with significant statistics, is of interest as a test of color suppression in charm decays. We have determined the branching ratios for these modes relative to Lambda(c)(+) --> pK(-) pi(+) and compared our results with theory.

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关键词

data collection,high energy physics

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