First Observation Of The Cabibbo-Suppressed Decays Xi(+)(C)->Sigma(+)Pi(-)Pi(+) And Xi(+)(C)->Sigma(-)Pi(+)Pi(+) And Measurement Of Their Branching Ratios

E. Vazquez-Jauregui,J. Engelfried,U. Akgun,G. Alkhazov,J. Amaro-Reyes,A. G. Atamantchouk,A. S. Ayan,M. Y. Balatz,A. Blanco-Covarrubias,N. F. Bondar,P. S. Cooper,L. J. Dauwe,G. V. Davidenko,U. Dersch,A. G. Dolgolenko,G. B. Dzyubenko,R. Edelstein,L. Emediato,A. M. F. Endler,I. Eschrich,C. O. Escobar,N. Estrada,A. V. Evdokimov,I. S. Filimonov,F. G. Garcia,M. Gaspero,I. Giller,V. L. Golovtsov,P. Gouffon,E. Guelmez,He Kangling,M. Iori,S. Y. Jun,M. Kaya,J. Kilmer,V. T. Kim,L. M. Kochenda,I. Konorov,A. P. Kozhevnikov,A. G. Krivshich,H. Krueger,M. A. Kubantsev,V. P. Kubarovsky,A. I. Kulyavtsev,N. P. Kuropatkin,V. F. Kurshetsov,A. Kushnirenko,S. Kwan, J. Lache,A. Lamberto,L. G. Landsberg,I. Larin,E. M. Leikin,Li Yunshan,G. Lopez-Hinojosa,M. Luksys,T. Lungov,V. P. Maleev,D. Mao,Mao Chensheng,Mao Zhenlin,P. Mathew,M. Mattson,V. Matveev,E. Mccliment,M. A. Moinester,V. V. Molchanov,A. Morelos,K. D. Nelson,A. V. Nemitkin,P. V. Neoustroev,C. Newsom,A. P. Nilov,S. B. Nurushev,A. Ocherashvili,Y. Onel,E. Ozel,S. Ozkorucuklu,A. Penzo,S. V. Petrenko,P. Pogodin,M. Procario,V. A. Prutskoi,E. Ramberg,G. F. Rappazzo,B. V. Razmysiovich,V. I. Rud,J. Russ,J. L. Sanchez-Lopez,P. Schiavon,J. Simon,A. I. Sitnikov,D. Skow,V. J. Smith,M. Srivastava,V. Steiner,V. Stepanov,L. Stutte,M. Svoiski,N. K. Terentyev,G. P. Thomas,I. Torres,L. N. Uvarov,A. N. Vasiliev,D. V. Vavilov,V. S. Verebryusov,V. A. Victorov,V. E. Vishnyakov,A. A. Vorobyov,K. Vorwalter,J. You,Zhao Wenheng,Zheng Shuchen,R. Zukanovich-Funchal

PHYSICS LETTERS B（2008）

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摘要

We report the first observation of two Cabibbo-suppressed ecay modes, Xi(+)(c) -> Sigma(+)pi(-)pi(+) and Xi c+ -> Sigma(-)pi(+)pi(+). We observe 59 +/- 14 over a background of 87, and 22 +/- 8 over a background of 13 events, respectively, for the signals. The data were accumulated using the SELEX spectrometer during the 1996-1997 fixed target run at Fermilab, chiefly from a 600 Gev/c Sigma(-) beam. The branching ratios of the decays relative to the Cabibbo-favored Xi c+ -> Xi(-)pi(+)pi(+) are measured to be B(Xi(+)(c) -> Sigma(+)pi(-)pi(+))/B(Xi(+)(c) -> Xi(-)pi(+)pi(+)) = 0.48 +/- 0.20, and B(Xi(+)(c) -> Sigma(-)pi(+)pi(+))/B(Xi(+)(c) -> Sigma(-)pi(+)pi(+)) = 0.18 +/- 0.09, respectively. We also report branching ratios for the same decay modes of the Delta(+)(c) relative to Delta(+)(c) -> pK(-)pi(+.) (C) 2008 Elsevier B.V. All rights reserved.

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关键词

13.30.-a,13.30.Eg,14.20.Lq

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