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

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; Golovtsov, VL; 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; Ozkorucuklu, Suat; Penzo, A; Petrenko, SV; Pogodin, P; Procario, M; Prutskoi, VA; 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

doi:10.1016/j.physletb.2005.09.043

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

Atıf İçin Kopyala

Ocherashvili A., Moinester M., Russ J., Engelfried J., Torres I., Akgun U., ...Daha Fazla

PHYSICS LETTERS B, cilt.628, ss.18-24, 2005 (SCI-Expanded)

Yayın Türü: Makale / Tam Makale
Cilt numarası: 628
Basım Tarihi: 2005
Doi Numarası: 10.1016/j.physletb.2005.09.043
Dergi Adı: PHYSICS LETTERS B
Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
Sayfa Sayıları: ss.18-24
İstanbul Üniversitesi Adresli: Hayır

Özet

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.