Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2005-08-30
Phys.Rev.Lett.95:251801,2005
Physics
High Energy Physics
High Energy Physics - Experiment
9 pages postscript,also available through http://www.lns.cornell.edu/public/CLNS/2005/, Submitted to PRL
Scientific paper
10.1103/PhysRevLett.95.251801
We extract a relatively precise value for the decay constant of the D+ meson by measuring B(D+ -> mu+ nu)=(4.40 +/- 0.66 {+0.09}{-0.12}) x 10^{-4}, using 281 inverse-pb of data taken on the psi(3770) resonance with the CLEO-c detector. We find fD+=(222.6 +/- 16.7 {+2.8}{-3.4}) MeV, and compare with current theoretical calculations. We also set a 90% confidence upper limit on B(D+ -> e+ nu)<2.4 x 10^{-5} which limits contributions from non-standard model physics.
Artuso Marina
CLEO Collaboration
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