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Measuring cal B(D^+ --> mu^+ nu) and the Pseudoscalar Decay Constant f_D^+

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arxiv hep-ex/0411050 v2 pith:NIX4SS5X submitted 2004-11-15 hep-ex

G. Bonvicini , et al , CLEO Collaboration This is my paper · ORCID
classification hep-ex
keywords decaybackgroundcandidatescleo-ccompellingconstantcontainingdata
verification ladder T0 review T1 audit T2 compute T3 formal
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In 60 inverse-pb of data taken on the psi(3770) resonance with the CLEO-c detector, we find 8 D+ -> mu+ nu decay candidates that are mostly signal, containing only 1 estimated background. Using this statistically compelling sample, we measure a value of B(D+ -> mu+ nu) = (3.5 +/- 1.4 +/- 0.6) x10^(-4), and determine fD+=(202 +/- 41 +/-17) MeV.

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  1. Prospective analysis of CKM element $|V_{cd}|$ and $D^+$-meson decay constant from leptonic decays $D^+ \to \ell^+ \nu$

    hep-ph 2024-11 conditional novelty 3.0 of 10

    A QCD sum rule calculation with dimension-six condensates gives f_D+ = 203.0 ± 1.5 MeV and, with BESIII data, |Vcd| = 0.227 +0.002 -0.001.

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