- 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...
Expand abstract - 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:
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1550-7998
- URN:
-
uuid:ded68e3f-9c15-4838-b8a1-add9329a471f
- Source identifiers:
-
160960
- Local pid:
- pubs:160960
- Language:
- English
- Copyright date:
- 2008
Journal article
Precision measurement of B(D+→μ+ν) and the pseudoscalar decay constant fD+
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