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Browsing by Subject "Ds"

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    Ds semileptonic decays
    (2014-12) Hietala, Justin Thomas
    We measure six exclusive Ds semileptonic branching ratios using CLEO-c data collected at 4170 MeV. We isolate our semileptonic events by reconstructing a tagged Ds to identify a Ds*Ds event, then we find an electron and the semileptonic hadron. Dropping the Ds* daughter photon gives us additional events and avoids the need to model soft photon backgrounds, at the expense of a clean neutrino missing mass. We obtain BR(Ds→φeν) = (2.14±0.17±0.09)% and BR(Ds→ηeν) = (2.28±0.14±0.20)% for the two largest branching ratios.