Besson, David Zeke2007-04-132007-04-132005-12Artuso, M, Boulahouache, C, et al. Improved measurement of B(D+->mu(+)nu) and the pseudoscalar decay constant f(D)(+). PHYSICAL REVIEW LETTERS. December 2005. 95(25)https://hdl.handle.net/1808/1441We extract a relatively precise value for the decay constant of the D+ meson by measuring B(D+->mu(+)nu)=(4.40 +/- 0.66(-0.12)(+0.09))x10(-4) using 281 pb(-1) of data taken on the psi(3770) resonance with the CLEO-c detector. We find f(D)(+)=(222.6 +/- 16.7(-3.4)(+2.8)) MeV, and compare with current theoretical calculations. We also set a 90% confidence upper limit on B(D+-> e(+)nu)< 2.4x10(-5) which constrains new physics models.en-USArticleopenAccess