First observation of the Cabibbo-suppressed decays Ξc+→Σ+π−π+ and Ξc+→Σ−π+π+ and measurement of their branching ratios
- Vázquez-Jáuregui, E.
- Engelfried, J.
- Akgun, U.
- Alkhazov, G.
- Amaro-Reyes, J.
- Atamantchouk, A.G.
- Ayan, A.S.
- Balatz, M.Y.
- Blanco-Covarrubias, A.
- 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.
- Estrada, N.
- Evdokimov, A.V.
- Filimonov, I.S.
- Garcia, F.G.
- Gaspero, M.
- Giller, I.
- Golovtsov, V.L.
- Gouffon, P.
- Gülmez, E.
- He, Kangling
- Iori, M.
- Jun, S.Y.
- Kaya, M.
- Kilmer, J.
- Kim, V.T.
- Kochenda, L.M.
- Konorov, I.
- Kozhevnikov, A.P.
- Krivshich, A.G.
- Krü, 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.
- Li, Yunshan
- Ló, G.
- Luksys, M.
- Lungov, T.
- Maleev, V.P.
- Mao, D.
- Mao, Chensheng
- Mao, Zhenlin
- Mathew, P.
- Mattson, M.
- Matveev, V.
- McCliment, E.
- Moinester, M.A.
- Molchanov, V.V.
- Morelos, A.
- Nelson, K.D.
- Nemitkin, A.V.
- Neoustroev, P.V.
- Newsom, C.
- Nilov, A.P.
- Nurushev, S.B.
- Ocherashvili, A.
- 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.
- Russ, J.
- Sánchez-López, J.L.
- 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, G.P.
- Torres, I.
- Uvarov, L.N.
- Vasiliev, A.N.
- Vavilov, D.V.
- Verebryusov, V.S.
- Victorov, V.A.
- Vishnyakov, V.E.
- Vorobyov, A.A.
- Vorwalter, K.
- You, J.
- Zhao, Wenheng
- Zheng, Shuchen
- Zukanovich-Funchal, R.
Publication date
September 2008
DOI Publisher
Elsevier B.V. Published by Elsevier B.V.Abstract
AbstractWe report the first observation of two Cabibbo-suppressed decay modes, Ξc+→Σ+π−π+ and Ξc+→Σ−π+π+. We observe 59±14 over a background of 87, and 22±8 over a background of 13 events, respectively, for the signals. The data were accumulated using the SELEX spectrometer during the 1996–1997 fixed target run at Fermilab, chiefly from a 600GeV/c Σ− beam. The branching ratios of the decays relative to the Cabibbo-favored Ξc+→Ξ−π+π+ are measured to be B(Ξc+→Σ+π−π+)/B(Ξc+→Ξ−π+π+)=0.48±0.20, and B(Ξc+→Σ−π+π+)/B(Ξc+→Ξ−π+π+)=0.18±0.09, respectively. We also report branching ratios for the same decay modes of the Λc+ relative to Λc+→pK−π+
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