First Observation Of The Cabibbo Suppressed Decays Xi C Sigma Pi Pi And Xi C Sigma Pi Pi And Measurement Of Their Branching Ratios
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First Observation of the Cabibbo-suppressed Decays Xi+(c) ---] Sigma+ Pi- Pi+ and Xi+(c) ---] Sigma- Pi+ Pi+ and Measurement of Their Branching Ratios
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The authors report the first observation of two Cabibbo-suppressed decay modes,?{sub c} →?+?−?+ and?{sub c}+ →?−?+?+. They observe 56 ± 13 over a background of 21, and 23 ± 7 over a background of 12 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 600 GeV/c?− beam. The branching ratios of the decays relative to the Cabibbo-favored?{sub c}+ →?−?+?+ are measured to be B(?{sub c}+ →?+?−?+)/B(?{sub c}+ →?−?+?+) = 0.50 ± 0.20, and B(?{sub c}+ →?−?+?+)/B(?{sub c}+ →?−?+?+) = 0.23 ± 0.11, respectively. They also report branching ratios for the same decay modes of the?{sub c}+ relative to?{sub c}+ → pK−?+.
Measurements of Lambda[sub C][sup +] Branching Fractions of Cabibbo-Suppressed Decay Modes
The authors have measured the branching fractions of the Cabibbo-suppressed decays [Lambda][sub c][sup +] --> [Lambda][sup 0]K[sup +] and [Lambda][sub c][sup +] --> [Sigma][sup 0]K[sup +] relative to the Cabibbo-allowed decay modes [Lambda][sub c][sup +] --> [Lambda][sup 0][pi][sup +] and [Lambda][sub c][sup +] --> [Sigma][sup 0][pi][sup +] to be 0.044 [+-] 0.004 (stat.) [+-] 0.002 (syst.) and 0.040 [+-] 0.005 (stat.) [+-] 0.004 (syst.), respectively. They also present the first observation of [Lambda][sub c][sup +] --> [Lambda][sup 0]K[sup +][pi][sup +][pi][sup -] and have measured the branching fraction relative to [Lambda][sub c][sup +] --> [Lambda][sup 0][pi][sup +] to be 0.266 [+-] 0.027 (stat.) [+-] 0.032 (syst.). The upper limit of the branching fraction into the decay [Lambda][sub c][sup +] --> [Sigma][sup 0]K[sup +][pi][sup +][pi][sup -] relative to [Lambda][sub c][sup +] --> [Sigma][sup 0][pi][sup +] has been measured to be