New CLEO II Results on Charm Hadron Decays
Abstract
We present new results on charm hadron decays from the CLEO II experiment. The D*+ width is measured for the first time, Gamma(D*+) = 96 +- 4 +- 22 keV. The semileptonic decay branching fractions are determined to be B(D+ --> Kbar*0 e+ nue) = (6.7 +- 0.4 +- 0.5 +- 0.4)% and B(D+ --> Kbar*0 mu+ numu) = (6.5 +- 0.9 +- 0.5 +- 0.4)%. We observe evidence for Omegac --> Omega- e+ nue and measure the product of the branching fraction and cross section, B(Omegac --> Omega- e+ nue) x sigma(e+e- --> OmegacX) = 42.2 +- 14.1 +- 11.9 fb. Within the framework of Heavy Quark Effective Theory, we measure in the decay Lambda+c --> Lambda e+ nue the form factor ratio, R = f2/f1 = -0.31 +- 0.06 +- 0.06. This provides strong evidence that the form factor f2 describing spin interactionof the s quark is non-zero. The Xi+c lifetime is measured to be 503 +- 47 +- 18 fs. The results on branching fractions, cross section, and form factor ratio are preliminary.
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