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Published January 1, 2008 | Version v1
Journal article Open

First observation of the Cabibbo-suppressed decays Xi(+)(c)->Sigma(+)pi(-)pi(+) and Xi(+)(c)->Sigma(-)pi(+)pi(+) and measurement of their branching ratios

Creators

  • 1. Univ Autonoma San Luis Potosi, San Luis Potosi, Mexico
  • 2. Univ Iowa, Iowa City, IA 52242 USA
  • 3. Petersburg Nucl Phys Inst, St Petersburg, Russia
  • 4. Inst Theoret & Expt Phys, Moscow 117259, Russia
  • 5. Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA
  • 6. Univ Michigan, Flint, MI 48502 USA
  • 7. Max Planck Inst Kernphys, D-69117 Heidelberg, Germany
  • 8. Carnegie Mellon Univ, Pittsburgh, PA 15213 USA
  • 9. Univ Sao Paulo, Sao Paulo, Brazil
  • 10. Ctr Brasileiro Pesquisas Fis, Rio De Janeiro, Brazil

Description

We report the first observation of two Cabibbo-suppressed ecay 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 600 Gev/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) -> Sigma(-)pi(+)pi(+)) = 0.18 +/- 0.09, respectively. We also report branching ratios for the same decay modes of the Delta(+)(c) relative to Delta(+)(c) -> pK(-)pi(+.) (C) 2008 Elsevier B.V. All rights reserved.

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