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Smith, VJ; Srivastava, M; Steiner, V, V; Stepanov, V, V; Stutte, L; Svoiski, M; Terentyev, NK; Thomas, GP; Uvarov, LN; Vasiliev, AN; Vavilov, DV; Verebryusov, VS; Victorov, VA; Vishnyakov, VE; Vorobyov, AA; Vorwalter, K; Wenheng, Z; You, J; Yunshan, L; Zhenlin, M; Zhigang, L; Zukanovich Funchal R
Physical review letters, 2000-Feb-28, 20000228, Letnik: 84, Številka: 9Journal Article
We report the first observation of the Cabibbo-suppressed charm baryon decay Xi(+)(c)-->pK(-)pi(+). 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 600 GeV/c Sigma(-) beam. The branching fractions of the decay relative to the Cabibbo-favored Xi(+)(c)-->Sigma+K-pi(+) and Xi(+)(c)-->Xi(-)pi(+)pi(+) are measured to be B(Xi(+)(c)-->pK(-)pi(+))/B(Xi(+)(c)-->Sigma+K-pi(+)) = 0.22+/-0. 06+/-0.03 and B(Xi(+)(c)-->pK(-)pi(+))/B(Xi(+)(c)-->Xi(-)pi(+)pi(+)) = 0.20+/-0.04+/-0.02, respectively.
