Measurement of the product branching fraction B ( c → Θ c X ) × B ( Θ c → Λ X )

Y Kubota, A Anastassov,S Schrenk,P Pomianowski,A Bean,D Besson, Harold Bull,J L Rodriguez,Yao Li,Lirong Jian,L Ling,A H Mahmood,M Saleem,S Timm,F R Wappler,R Davis,R J Wilson,D Y J Kim,Y S Gao,T O Meyer,Yuan Liu,Taeho Lee,James R Holliday,A L Lyon,S Kotov, Ilya Kravchenko,N Kwak,Ian Robertson,Russell P Stutz,Xubo Zhao, E Lipeles,D L Kreinick,E H Thorndike,C P Jessop,K Lingel,H Marsiske,M Perl, V Savinov, F Wurthwein,A J Weinstein,S Marka,K W Mclean,C D Jones,P I Hopman,S E Csorna, Jian Wu, A Wolf,J C Wang, D Ugolini,Xueping Zhou,J Lee,B K Heltsley,D L Hartill,J Urheim,S W Gray,B Gittelman, L Gibbons,A I Rubiera, C Prescott,M Lohner,J E Duboscq,M Palmer,C Plager,P Avery,A Warburton,B Valantspaight,P G Thies,J G Thayer,D Riley, D Peterson,J R Patterson,E Nordberg,C R Ng,N B Mistry,R Poling,T Riehle,A M Smith,C Sedlack,M Selen,J J Thaler,J C Williams,K W Edwards,R Janicek,P M Patel,A J Sadoff, T Wlodek,J Ye, R Stroynowski,S Ahmed,M S Alam,S B Athar,K K Gan,S Chen,Zhe Xu,R Godang,K Kinoshita,I C Lai,Stephen Chan,M Bishai, A Undrus, P Skubic,H Severini,S J Richichi,C Gwon,T Hart,K Honscheid,H Kagan,R Ammar, R Kass, Jan Lorenc,T E Browder,P Baringer,H Schwarthoff,M M Zoeller, W M Sun,P Brabant,D H Miller,M Schmidtler, E Von Toerne, J D Richman,G Eigen,Eric J Johnson,I Karliner,R A Briere,B H Behrens,D Cinabro, I P J Shipsey,Y Kwon, Lalith Perera,M A Marsh, W T Ford, A V Gritsan,A Eppich,D M Asner,T K Nelson,Haruhiko Yamamoto,T Bergfeld,R L Greene,P Gaidarev,A Foland,R Ehrlich,K M Ecklund, P S Drell,S Anderson,M Dickson,D G Cassel, V Boisvert,F Blanc,R J Morrison,V V Frolov,K Berkelman,B E Berger,C Bebek,Robert J Baker, J P Alexander,J G Smith,J Roy,D J Lange,T E Coan,V Fadeyev, I Korolkov,Y Maravin,I Narsky, T S Hill, J Gronberg,S J Lee,H Krieg, G H A Viehhauser,A Titov,S Stone,R Mahapatra,T Skwarnicki,S Schuh,R Mountain,G C Moneti,J J O Neill, V Sharma,R M Hans,E I Shibata,S Prell,G J Zhou, G Majumder,S Kopp,J W Hinson,J Fast,G D Gollin,Gary E Gladding,J Ernst,B I Eisenstein,N Menon,A Shapiro,E M Potter,H P Paar,G E Masek,D E Jaffe,A Ershov,G Brandenburg,J Zheng,E Dambasuren,R Ayad,M Artuso, J Yelton,G Bonvicini

Physical Review D（2000）

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摘要

Based on an a high statistics e+e- -> ccbar data sample, we report on the inclusive rate for charmed baryons to decay into / particles using charm-event tagging. We select e+e- -> ccbar events which have a clear anti-charm tag and measure the / content in the hemisphere opposite the tag (charge conjugate modes are implicit). This allows us to determine the product branching fraction: B(/)=B(c->Theta_c)*B(Theta_c->/\X), where Theta_c represents a sum over all charmed baryons produced in e+e- fragmentation at sqrt(s)=10.5 GeV, given our specific tags. We obtain B(/)=(1.87+/-0.03+/-0.33)%

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