The purely leptonic decays D+ → μ+ν and D+ s→ ℓ+ν at CLEO

Research output: Contribution to conferencePaper

Abstract

We update our previous results by increasing the luminosity, the efficiency, and for the D+ sthe number of tags. We determine f D+= (205.8 ± 8.5 ± 2.5) MeV, and an interim preliminary value of fD + s = (267.9 ± 8.2 ± 3.9) MeV, where both results are radiatively corrected. We agree with the recent most precise unquenched Lattice- QCD calculation for the D+, but are in disagreement for the D+ s . Several consequences are discussed, including the possibility of physics beyond the Standard Model.

Original languageEnglish (US)
StatePublished - Dec 1 2008
Event43rd Rencontres de Moriond on QCD and High Energy Interactions, QCD 2008 - La Thuile, Italy
Duration: Mar 8 2008Mar 15 2008

Other

Other43rd Rencontres de Moriond on QCD and High Energy Interactions, QCD 2008
CountryItaly
CityLa Thuile
Period3/8/083/15/08

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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  • Cite this

    Stone, S. (2008). The purely leptonic decays D+ → μ+ν and D+ s→ ℓ+ν at CLEO. Paper presented at 43rd Rencontres de Moriond on QCD and High Energy Interactions, QCD 2008, La Thuile, Italy.