First observation of doubly charmed baryons

Murray Moinester, S Ozkorucuklu, Y Onel,P V Neoustroev, Antonio Morelos Pineda,V A Prutskoi,N Bondar, A Penzo,A I Sitnikov,A A Vorobyov,D V Vavilov,G P Thomas,M Iori, Jay R Simon,A P Kozhevnikov,V T Kim,Kangling He,G B Dzyubenko,M Y Balatz,M Luksys,M A Kubantsev,A Lamberto,K Vorwalter,L Kochenda,Wenheng Zhao,N P Kuropatkin,Hans Kruger,T Lungov,L Emediato,V A Victorov,V F Kurshetsov,R Zukanovich Funchal,P Pogodin, Victor Golovtsov,C Escobar,Zhenlin Mao,Shuchen Zheng,E Ozel,K D Nelson, E Mccliment,Mithat Kaya,S Kwan,G V Davidenko, N K Terentiev,M Svoiski,A Ocherashvili,G F Rappazzo,Erhan Gulmez, A G Atamantchouk,I Konorov,A G Dolgolenko, M N Srivastava, S Y Jun,P Schiavon,A G Krivshich,J Engelfried,A E Kushnirenko, Dongsheng Mao,B V Razmyslovich, V P Maleev,L Uvarov,Yunshan Li, C R Newsom,D Skow,M Procario,V Steiner,A I Kulyavtsev,S B Nurushev,F G Garcia,A N Vasiliev,A P Nilov,V E Vishnyakov,V J Smith,J Russ,L G Landsberg, V I Rud,P S Cooper,I Larin,M Gaspero,V S Verebryusov,A Evdokimov,L Stutte,I Eschrich,V V Molchanov,S V Petrenko,L J Dauwe,I Giller, G Alkhazov, R M Edelstein,J Lach,V Kubarovsky,Chensheng Mao,I S Filimonov,U Dersch,Viktor Matveev,Jingsong You,P Mathew,Vyacheslav V Stepanov,E M Leikin,James Kilmer, M E Mattson,A V Nemitkin,E Ramberg,P Gouffon,A M F Endler

CZECHOSLOVAK JOURNAL OF PHYSICS（2003）

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Abstract

The SELEX experiment (E781) at Fermilab has observed two statistically compelling high mass states near 3.6 GeV/c(2), decaying to Lambda(c)(+)K(-)pi(+) and Lambda(c)(+)K(-)pi(+)pi(+). These final states are Cabibbo-allowed decay modes of doubly charmed baryons Xi(cc)(+) and Xi(cc)(++), respectively. The masses are in the range expected from theoretical considerations, but the spectroscopy is surprising. SELEX also has weaker preliminary evidence for a state near 3.8 GeV/c(2), a high mass state decaying to Lambda(c)(+)K(-)pi(+)pi(+), possibly an excited Xi(cc)(++) (ccu*). Data are presented and discussed.

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Key words

doubly charmed baryons ccu and ccd production cross sections projectile,dependence of cross section Hadronic decay of charmed baryons decay modes,of ccu and ccd mass and lifetime of ccu And ccd theoretical predictions

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