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Precision measurement of B(D+→μ+ν) and the pseudoscalar decay constant fD+

Abstract:

We measure the branching ratio of the purely leptonic decay of the D+ meson with unprecedented precision as B(D+→μ+ν)=(3.82±0. 32±0.09)×10-4, using 818pb-1 of data taken on the ψ(3770) resonance with the CLEO-c detector at the CESR collider. We use this determination to derive a value for the pseudoscalar decay constant fD+, combining with measurements of the D+ lifetime and assuming |Vcd|=|Vus|. We find fD+=(205.8±8.5±2.5)MeV. The decay rate asymmetry Γ(D+→μ+ν)-Γ(D-→μ-ν̄)Γ(D+→μ +ν)+Γ(D-→μ-ν̄...

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Publisher copy:
10.1103/PhysRevD.78.052003

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Journal:
Physical Review D - Particles, Fields, Gravitation and Cosmology
Volume:
78
Issue:
5
Publication date:
2008-09-11
DOI:
EISSN:
1550-2368
ISSN:
1550-7998
URN:
uuid:ded68e3f-9c15-4838-b8a1-add9329a471f
Source identifiers:
160960
Local pid:
pubs:160960
Language:
English

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