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

Ocherashvili, A.; Moinester, M.A.; Russ, J.; Engelfried, J.; Torres, I.; 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.E.; Eschrich, I.; Escobar, C.O.; Evdokimov, A.V.; Filimonov, I.S.; Garcia, F.G.; Mario, Gaspero; Giller, I.; Golovtsov, V.L.; Gouffon, P.; Gulmez, E.; Kangling, H.; Iori, M.; Jun, S.Y.; Kaya, M.; Kilmer, J.; Kim, V.T.; Kochenda, L.M.; Konorov, I.; Kozhevnikov, A.P.; Krivshich, A.G.; Kruger, H.; Kubantsev, M.A.; Kubarovsky, V.; 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.; Li, Y.S.; Luksys, M.; Lungov, T.; Maleev, V.P.; Mao, D.; Mao, C.S.; Mao, Z.L.; Mathew, P.; Mattson, M.; Matveev, V.; Mccliment, E.; Molchanov, V.V.; Morelos, A.; Nelson, K.D.; Nemitkin, A.V.; Neoustroev, P.V.; Newsom, C.; 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.; Skow, D.; Smith, V.J.; Srivastava, M.; Steiner, V.; Stepanov, V.; Stutte, L.; Svoiski, M.; Terentyev, N.K.; Thomas, Gp; Uvarov, L.N.; Vasiliev, A.N.; Vavilov, D.V.; Vazquez-Jauregui, E.; Verebryusov, V.S.; Victorov, V.A.; Vishnyakov, V.E.; Vorobyov, A.A.; Vorwalter, K.; You, J.; Zhao, W.H.; Zheng, S.C.; Zukanovich-Funchal, R.

doi:10.1016/j.physletb.2005.09.043

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We observe a signal for the doubly charmed baryon Xi(cc)(+) in the decay mode Xi(cc)(+) -> pD(+)K(-) to complement the previous cc reported decay Xi(cc)(+) -> Lambda(c)(+)K(-)pi(+) 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 4.8 sigma. The Poisson probability that a background fluctuation can produce the apparent signal is less than 6.4 x 10(-4). The observed mass of this state is 3518 +/- 3 MeV/c(2), consistent with the published result. Averaging the two results gives a mass of 3518.7 +/- 1.7 MeV/c(2). 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. (c) 2005 Elsevier B.V. All rights reserved.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11573/19736

Titolo:	Confirmation of the doubly charmed baryon Epsilon(+)(cc)(3520) via its decay to pD(+)K(-)
Autori interni:	GASPERO, Mario
Data di pubblicazione:	2005
Rivista:	PHYSICS LETTERS. SECTION B
Abstract:	We observe a signal for the doubly charmed baryon Xi(cc)(+) in the decay mode Xi(cc)(+) -> pD(+)K(-) to complement the previous cc reported decay Xi(cc)(+) -> Lambda(c)(+)K(-)pi(+) 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 4.8 sigma. The Poisson probability that a background fluctuation can produce the apparent signal is less than 6.4 x 10(-4). The observed mass of this state is 3518 +/- 3 MeV/c(2), consistent with the published result. Averaging the two results gives a mass of 3518.7 +/- 1.7 MeV/c(2). 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. (c) 2005 Elsevier B.V. All rights reserved.
Handle:	http://hdl.handle.net/11573/19736
Appare nelle tipologie:	01.a Pubblicazione su Rivista

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