Confirmation of the doubly charmed baryon Epsilon(+)(cc)(3520) via its decay to pD(+)K(-)
Yazar
Golovtsov, VL
Ramberg, E
Rappazzo, GF
Razmyslovich, BV
Rud, VI
Schiavon, P
Simon, J
Sitnikov, AI
Skow, D
Smith, VJ
Srivastava, M
Steiner, V
Stepanov, V
Stutte, L
Svoiski, M
Terentyev, NK
Thomas, GP
Uvarov, LN
Vasiliev, AN
Vavilov, DV
Vazquez-Jauregui, E
Verebryusov, VS
Victorov, VA
Vishnyakov, VE
Vorobyov, AA
Vorwalter, K
You, J
Zhao, WH
Zheng, SC
Zukanovich-Funchal, R
Ozkorucuklu, Suat
Ocherashvili, A
Moinester, MA
Russ, J
Engelfried, J
Torres, I
Akgun, U
Alkhazov, G
Amaro-Reyes, J
Atamantchouk, AG
Ayan, AS
Balatz, MY
Bondar, NF
Cooper, PS
Dauwe, LJ
Davidenko, GV
Dersch, U
Dolgolenko, AG
Dzyubenko, GB
Edelstein, R
Emediato, L
Endler, AME
Eschrich, I
Escobar, CO
Evdokimov, AV
Filimonov, IS
Garcia, FG
Gaspero, M
Giller, I
Gouffon, P
Gulmez, E
Kangling, H
Iori, M
Jun, SY
Kaya, M
Kilmer, J
Kim, VT
Kochenda, LM
Konorov, I
Kozhevnikov, AP
Krivshich, AG
Kruger, H
Kubantsev, MA
Kubarovsky, V
Kulyavtsev, AI
Kuropatkin, NP
Kurshetsov, VF
Kushnirenko, A
Kwan, S
Lach, J
Lamberto, A
Landsberg, LG
Larin, I
Leikin, EM
Li, YS
Luksys, M
Lungov, T
Maleev, VP
Mao, D
Mao, CS
Mao, ZL
Mathew, P
Mattson, M
Matveev, V
McCliment, E
Molchanov, VV
Morelos, A
Nelson, KD
Nemitkin, AV
Neoustroev, PV
Newsom, C
Nilov, AP
Nurushev, SB
Onel, Y
Ozel, E
Penzo, A
Petrenko, SV
Pogodin, P
Procario, M
Prutskoi, VA
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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.
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