Observation of the Cabibbo-suppressed decay Xi_c+ -> p K- pi+

Details Observation of the Cabibbo-suppressed decay Xi_c+ -> p K- pi+ Observation of the Cabibbo-suppressed decay Xi_c+ -> p K- pi+

1999-07-29

arxiv.org/abs/hep-ex/9907062v1

Phys.Rev.Lett.84:1857-1861,2000

Physics

High Energy Physics

High Energy Physics - Experiment

5 pages, RevTeX, 3 figures (postscript), Submitted to Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.84.1857

We report the first observation of the Cabibbo-suppressed charm baryon decay Xi_c+ -> p K- pi+. We observe 150 +- 22 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+ -> X- pi+ pi+ are measured to be B(Xi_c+ -> p K- pi+)/B(Xi_c+ -> Sigma+ K- pi+) = 0.22 +- 0.06 +- 0.03 and B(Xi_c+ -> p K- pi+)/B(Xi_c+ -> X- pi+ pi+) = 0.20 +- 0.04 +- 0.02, respectively.

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