# New CLEO II Results on Charm Hadron Decays

Source: [New CLEO II Results on Charm Hadron Decays](<https://www.sota2.com/research/paper/68fa1ed77a2b558e29324f7f>)

Collection index: [llms.txt](<https://www.sota2.com/research/llms.txt>)

Data updated: 2025-10-23T16:09:38.888Z

Authors: K.K. Gan

Published: 2002-02-04T18:30:51.000Z

## 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+ nu\_e) = (6.7 +- 0.4 +- 0.5 +- 0.4)% and B(D+ --\> Kbar\*0 mu+ nu\_mu) = (6.5 +- 0.9 +- 0.5 +- 0.4)%. We observe evidence for Omega\_c --\> Omega- e+ nu\_e and measure the product of the branching fraction and cross section, B(Omega\_c --\> Omega- e+ nu\_e) x sigma(e+e- --\> Omega\_cX) = 42.2 +- 14.1 +- 11.9 fb. Within the framework of Heavy Quark Effective Theory, we measure in the decay Lambda+\_c --\> Lambda e+ nu\_e the form factor ratio, R = f\_2/f\_1 = -0.31 +- 0.06 +- 0.06. This provides strong evidence that the form factor f\_2 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.

## Recorded benchmark results

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## Original sources and implementation

[Original paper](<https://arxiv.org/abs/hep-ex/0202012>)

[PDF](<https://arxiv.org/pdf/hep-ex/0202012.pdf>)