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Measurement of B(Ds+ -> l plus v) and the decay constant fDs+ from 600 pb(-1) of e(+)e(-) annihilation data near 4170 MeV

Abstract:

We examine e+e-→Ds-Ds*+ and Ds*-Ds+ interactions at 4170 MeV using the CLEO-c detector in order to measure the decay constant fDs+ with good precision. Previously our measurements were substantially higher than the most precise lattice based QCD calculation of (241± 3)MeV. Here we use the Ds+→+ν channel, where the + designates either a μ+ or a τ+, when the τ+→π+ν̄. Analyzing both modes independently, we determine B(Ds+→μ+ν)=( 0.565±0.045±0.017)%, and B(Ds+→τ+ν)=(6.42±0.81± 0.18)%. We also ana...

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Publication status:
Published

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Publisher copy:
10.1103/PhysRevD.79.052001

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Journal:
PHYSICAL REVIEW D
Volume:
79
Issue:
5
Publication date:
2009-03-05
DOI:
EISSN:
1550-2368
ISSN:
1550-7998
URN:
uuid:de3793af-59be-4507-a56f-a4e0b7afcbe3
Source identifiers:
18792
Local pid:
pubs:18792
Language:
English

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