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First observation of the doubly charmed baryon Xi(+)(cc) |
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| Authors: | Mattson M Alkhazov G Atamantchouk A G Balatz M Y Bondar N F Cooper P S Dauwe L J Davidenko G V Dersch U Dolgolenko A G Dzyubenko G B Edelstein R Emediato L Endler A M F Engelfried J Eschrich I Escobar C O Evdokimov A V Filimonov I S Garcia F G Gaspero M Giller I Golovtsov V L Gouffon P Gülmez E Kangling He Iori M Jun S Y Kaya M Kilmer J Kim V T Kochenda L M Konorov I Kozhevnikov A P Krivshich A G Krüger H Kubantsev M A Kubarovsky V P Kulyavtsev A I Kuropatkin N P Kurshetsov V F Kushnirenko A Kwan S Lach J Lamberto A Landsberg L G Larin I Leikin E M Yunshan Li Luksys M Lungov T Maleev V P |
| Institution: | Carnegie-Mellon University, Pittsburgh, Pennsylvania 15213, USA. |
| Abstract: | We observe a signal for the doubly charmed baryon Xi(+)(cc) in the charged decay mode Xi(+)(cc)-->Lambda(+)(c)K-pi(+) in data from SELEX, the charm hadroproduction experiment at Fermilab. We observe an excess of 15.9 events over an expected background of 6.1+/-0.5 events, a statistical significance of 6.3sigma. The observed mass of this state is 3519+/-1 MeV/c(2). The Gaussian mass width of this state is 3 MeV/c(2), consistent with resolution; its lifetime is less than 33 fs at 90% confidence. |
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