Improved measurement of B (D+ ---> mu+ nu) and the pseudoscalar decay constant f(D+)

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.

13.66.Bc
12.39.St
13.20.Fc
D mesons
meson leptonic decay
unified gauge models
electron positron: colliding beams
electron positron: annihilation
psi(3685): electroproduction
D: pair production

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