Measurements of Ξc+ branching ratios

Using data collected by the fixed target Fermilab experiment FOCUS, we measure the branching ratios of the Cabibbo-favored decays Xi(c)(+) --> Sigma(+)K(-)pi(+), Xi(c)(+) --> Sigma(+)(K) over bar*(892)(0), and Xi(c)(+) --> Lambda(0)K(-)pi(+)pi(+) relative to Xi(c)(+) --> Xi(-)pi(+)pi(+) to be 0.91 +/- 0.11 +/- 0.04, 0.78 +/- 0.16 +/- 0.06, and 0.28 +/- 0.06 +/- 0.06, respectively. We report the first observation of the Cabibbo-suppressed decay Xi(c)(+) --> Sigma(+)K(+)K(-) and we measure the branching ratio relative to Xi(c)(+) --> Sigma(+)K(-)pi(+) to be 0.16 +/- 0.06 +/- 0.01. We also set 90% confidence level upper limits for Xi(c)(+) --> Sigma(+)phi and Xi(c)(+) --> Xi*(1690)(0)(Sigma(+)K(-))K+ relative to Xi(c)(+) --> Sigma(+)K(-)pi(+) to be 0.12 and 0.05, respectively. We find an indication of the decays Xi(c)(+) --> Omega(-)K(+)pi(+) and Xi(c)(+) --> Sigma*(1385)(+)(K) over bar (0) and set 90% confidence level upper limits for the branching ratios with respect to Xi(c)(+) --> Xi(-)pi(+)pi(+) to be 0.12 and 1.72, respectively. Finally, we determine the 90% C.L. upper limit for the resonant contribution Xi(c)(+) --> Xi*(1530)(0)pi(+) relative to Xi(c)(+) --> Xi(-)pi(+)pi(+) to be 0.10. (C) 2003 Elsevier B.V. All rights reserved.