Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2008-04-15
Phys.Lett.B666:299-304,2008
Physics
High Energy Physics
High Energy Physics - Experiment
15 pages, 5 figures, version 2 as accepted in PLB
Scientific paper
10.1016/j.physletb.2008.07.072
We report the first observation of two Cabibbo-suppressed decay modes, Xi_c+ -> Sigma+ pi- pi+ and Xi_c+ -> Sigma- pi+ pi+. 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 Sigma- beam. The branching ratios of the decays relative to the Cabibbo--favored Xi_c+ -> Xi- pi+ pi+ are measured to be B(Xi_c+ -> Sigma+ pi- pi+)/B(Xi_c+ -> Xi- pi+ pi+) = 0.48+/-0.20, and B(Xi_c+ -> Sigma- pi+ pi+)/B(Xi_c+ -> Xi- pi+ pi+) = 0.18+/-0.09, respectively. We also report branching ratios for the same decay modes of the Lambda_c+ relative to Lambda_c+ -> p K- pi+.
Engelfried Jurgen
SELEX Collaboration
Vázquez-Jáuregui E.
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