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

Abstract

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.

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

References in corpus (2)

• The SELEX Phototube RICH Detector
• Observation of the ${\Xi }_c^{+}$ Charmed Baryon Decays to ${\Sigma }^{+}{K}^{-}{\pi }^{+}$, ${\Sigma }^{+}{\bar{K}}^{\ast 0}$, and $\Lambda K^{-}{\pi }^{+}{\pi }^{+}$

Cited by in corpus (8)

• First measurements of absolute branching fractions of the ${\Xi }_c^{+}$ baryon at Belle
• A search for CP violation and a measurement of the relative branching fraction in D+ -> KKpi decays
• SELEX RICH Performance and Physics Results
• Measurements of ${\Xi }_c^{+}$ Branching Ratios
• Measurement of the relative branching ratio BR(Ξ_c^+ \to p^+ K^-π^+)\BR(Ξ_c^+ \to Ξ^- π^+ π^+)
• Measuring c-quark polarization in W+c samples at ATLAS and CMS
• First Observation of the Cabibbo-suppressed Decays Xi_c+ -> Sigma+ pi- pi+ and Xi_c+ -> Sigma- pi+ pi+ and Measurement of their Branching Ratios
• Experimental results on hadronic c decays