Improved Measurement of $B (D^{+} \to μ^{+} ν)$ 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^{+} \to μ^{+} ν) = (4.40 \pm {0.66}_{- 0.12}^{+ 0.09}) \times 10^{- 4}

using

281 {pb}^{- 1}

of data taken on the

ψ (3770)

resonance with the CLEO-

c

detector. We find

f_{D^{+}} = (222.6 \pm {16.7}_{- 3.4}^{+ 2.8}) MeV

, and compare with current theoretical calculations. We also set a 90% confidence upper limit on

B (D^{+} \to e^{+} ν) < 2.4 \times 10^{- 5}

which constrains new physics models.

This publication has 28 references indexed in Scilit:

The CLEO RICH detector
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2005
MeasuringB(D+→μ+ν)and the pseudoscalar decay constantfD+
Physical Review D, 2004
Review of Particle Physics
Physics Letters B, 2004
Cabibbo-suppressed decays ofD+→π+π0,K+K0,K+π0
Physical Review D, 2004
High-Precision Lattice QCD Confronts Experiment
Physical Review Letters, 2004
Construction, pattern recognition and performance of the CLEO III LiF-TEA RICH detector
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2003
The CLEO III drift chamber
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2002
The CLEO II detector
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1992
Search for b→sγ in exclusive decays of B mesons
Physics Letters B, 1989
Relativistic treatment of light quarks inDandBmesons andW-exchange weak decays
Physical Review D, 1988

Improved Measurement ofB(D+→μ+ν)and the Pseudoscalar Decay ConstantfD+