Journal
PHYSICAL REVIEW D
Volume 78, Issue 5, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.78.052003
Keywords
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Funding
- National Science Foundation
- U.S. Department of Energy
- Natural Sciences and Engineering Research Council of Canada
- U.K. Science and Technology Facilities Council
- STFC [PP/E002722/1, PP/F000650/1, ST/G502412/1] Funding Source: UKRI
- Science and Technology Facilities Council [PPA/A/S/2003/00461/2, PP/E002722/1, PP/F000650/1, ST/G502412/1] Funding Source: researchfish
- Direct For Mathematical & Physical Scien
- Division Of Physics [758312] Funding Source: National Science Foundation
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We measure the branching ratio of the purely leptonic decay of the D+ meson with unprecedented precision as B(D+ -> mu(+nu)) = (3.82 +/- 0.32 +/- 0.09) x 10(-4), using 818 pb(-1) of data taken on the psi(3770) resonance with the CLEO-c detector at the CESR collider. We use this determination to derive a value for the pseudoscalar decay constant f(D+), combining with measurements of the D+ lifetime and assuming vertical bar V-cd vertical bar = vertical bar V-us vertical bar. We find f(D+) = (205.8 +/- 8.5 +/- 2.5) MeV. The decay rate asymmetry Gamma(D+ -> mu(+)nu) - Gamma(D- -> mu(-) (nu) over bar) / Gamma(D+ -> mu(+)nu) + Gamma(D- -> mu(-) (nu) over bar) = 0.08 +/- 0.08, consistent with no CP violation. We also set 90% confidence level upper limits on B(D+ -> tau(+) v) < 1.2 x 10(-3) and B(D+ -> e(+) v) < 8.8 x 10(-6).
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