Jun, S. Y.Akchurin, N.Andreev, V. A.Atamantchouk, A. G.Aykac, M.Balatz, M. Y.Bondar, N. F.Bravar, A.Cooper, P. S.Dauwe, L. J.Davidenko, G. V.Dersch, U.Dolgolenko, A. G.Dreossi, D.Dzyubenko, G. B.Edelstein, R.Emediato, L.Endler, A. M.F.Engelfried, J.Eschrich, I.Escobar, C. O.Evdokimov, A. V.Filimonov, I. S.Garcia, F. G.Gaspero, M.Gerzon, S.Giller, I.Golovtsov, V. L.Goncharenko, Y. M.Gottschalk, E.Gouffon, P.Grachov, O. A.Gülmez, E.Iori, M.Kamenski, A. D.Kangling, H.Kaya, M.Kilmer, J.Kim, V. T.Kochenda, L. M.Königsmann, K.Konorov, I.Kozhevnikov, A. A.Krivshich, A. G.Krüger, 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.Luksys, M.Lungov, T. [UNESP]Magarrel, D.Maleev, V. P.Mao, D.Masciocchi, S.Mathew, P.Mattson, M.Matveev, V.Mc Climent, E.Mc Kenna, S. L.Moinester, M. A.Molchanov, V. V.Morelos, A.Mukhin, V. A.Nelson, K. D.Nemitkin, A. V.Neoustroev, P. V.Newsom, C.Nilov, A. P.Nurushev, S. B.Ocherashvili, A.Oleynik, G.Onel, Y.Ozel, E.Ozkorucuklu, S.Patrichev, S.Penzo, A.Petrenko, S. I.Pogodin, P.Povh, B.Procario, M.Prutskoi, V. A.Ramberg, E.Rappazzo, G. F.Razmyslovich, B. V.Rud, V. I.Russ, J.Schiavon, P.Semyatchkin, V. K.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.Uvarov, L. N.Vasiliev, A. N.Vavilov, D. V.Verebryusov, V. S.Victorov, V. A.Vishnyakov, V. E.Vorobyov, A. A.Vorwalter, K.Wenheng, Z.You, J.Yunshan, L.Zhenlin, M.Zhigang, L.Zukanovich Funchal, R.2022-04-282022-04-282000-01-01Physical Review Letters, v. 84, n. 9, p. 1857-1861, 2000.1079-71140031-9007http://hdl.handle.net/11449/223859We report the first observation of the Cabibbo-suppressed charm baryon decay Ξ+c→pK- π+. We observe 150±22±5 events for the signal. 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 fractions of the decay relative to the Cabibbo-favored Ξ+c→Σ+K-π+ and Ξ+c→Ξ-π+π+ are measured to be B(Ξ+c→pK-π+)/B(Ξ+c→Σ+K-π+)=0.22±0.06±0.03 and B(Ξ+c→pK-π+)/B(Ξ+c→Ξ-π+π+)=0.20±0.04±0.02, respectively. © 2000 The American Physical Society.1857-1861engArtigo10.1103/PhysRevLett.84.18572-s2.0-0004623884