Confirmation of the doubly charmed baryon Ξcc+(3520) via its decay to pD+K

We observe a signal for the doubly charmed baryon Ξcc+ in the decay mode Ξcc+→pD+K− to complement the previous reported decay Ξcc+→Λc+K−π+ in data from SELEX, the charm hadroproduction experiment at Fermilab. In this new decay mode we observe an excess of 5.62 events over a combinatoric background e...

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Veröffentlicht in:	Physics letters. B 2005-11, Vol.628 (1-2), p.18-24
Hauptverfasser:	Ocherashvili, A., Moinester, M.A., Engelfried, J., Akgun, U., Alkhazov, G., Amaro-Reyes, J., Atamantchouk, A.G., Ayan, A.S., 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., 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., 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., Yunshan, Li, Luksys, M., Maleev, V.P., Mao, D., Chensheng, Mao, Mathew, P., Mattson, M., McCliment, E., Molchanov, V.V., Morelos, A., Nelson, K.D., Nemitkin, A.V., Neoustroev, P.V., Nilov, A.P., Nurushev, S.B., Onel, Y., Ozel, E., Ozkorucuklu, S., Penzo, A., Petrenko, S.V., Pogodin, P., Procario, M., Prutskoi, V.A., Ramberg, E., Rappazzo, G.F., Razmyslovich, B.V., Rud, V.I., Schiavon, P., Simon, J., Sitnikov, A.I., Smith, V.J., Srivastava, M., Steiner, V., Stepanov, V., Stutte, L., Svoiski, M., Terentyev, N.K., Thomas, G.P., Vasiliev, A.N., Vavilov, D.V., Vázquez-Jáuregui, E., Verebryusov, V.S., Victorov, V.A., Vishnyakov, V.E., Vorobyov, A.A., Vorwalter, K., You, J., Wenheng, Zhao, Shuchen, Zheng, Zukanovich-Funchal, R.
Format:	Artikel
Sprache:	eng
Schlagworte:	Doubly charmed baryon Exact sciences and technology Nuclear physics Physics The physics of elementary particles and fields
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Zusammenfassung:	We observe a signal for the doubly charmed baryon Ξcc+ in the decay mode Ξcc+→pD+K− to complement the previous reported decay Ξcc+→Λc+K−π+ in data from SELEX, the charm hadroproduction experiment at Fermilab. In this new decay mode we observe an excess of 5.62 events over a combinatoric background estimated by event mixing to be 1.38±0.13 events. The mixed background has Gaussian statistics, giving a signal significance of 4.8σ. The Poisson probability that a background fluctuation can produce the apparent signal is less than 6.4×10−4. The observed mass of this state is 3518±3 MeV/c2, consistent with the published result. Averaging the two results gives a mass of 3518.7±1.7 MeV/c2. The observation of this new weak decay mode confirms the previous SELEX suggestion that this state is a double charm baryon. The relative branching ratio for these two modes is 0.36±0.21.
ISSN:	0370-2693 1873-2445
DOI:	10.1016/j.physletb.2005.09.043