Direct Measurement of the Pseudoscalar Decay Constant fD+

Abstract

The absolute branching fraction of $D^{+}\to {\mu }^{+}\nu$ has been directly measured by an analysis of a data sample of about 33 $\mathrm{p}{\mathrm{b}}^{-1}$ collected around $\sqrt{s}=3.773$ GeV with the BES-II at the BEPC. At these energies, $D^{-}$ meson is produced in pair as $e^{+}{e}^{-}\to D^{+}{D}^{-}$. A total of $5321\pm 149\pm 160$ $D^{-}$ mesons are reconstructed from this data set. In the recoil side of the tagged $D^{-}$ mesons, $2.67\pm 1.74$ purely leptonic decay events of $D^{+}\to {\mu }^{+}\nu$ are observed. This yields a branching fraction of $BF(D^{+}\to {\mu }^{+}{\nu }_{\mu })=(0.122_{-0.053}^{+0.111}\pm 0.010)$, and a corresponding pseudoscalar decay constant $f_{D^{+}}=(371_{-119}^{+129}\pm 25)$ MeV.

arXiv comment7 pages, 8 figures, Submitted to Physics Letters B in October, 2004

References in corpus (6)

• Big Bang Nucleosynthesis (in "The Review of Particle Properties" 2004)
• Direct Measurements of the Branching Fractions for $D^0\to K^{-}{e}^{+}{\nu }_e$ and $D^0\to {\pi }^{-}{e}^{+}{\nu }_e$ and Determinations of the Form Factors $f_{+}^K(0)$ and $f_{+}^{\pi }(0)$
• Improved Measurement of the Pseudoscalar Decay Constant $f_{D_s}$
• Leptonic decays of the Ds meson
• Measurement of B(D_s+ -> mu+ nu_mu)/B(D_s+ -> phi mu+ nu_mu) and Determination of the Decay Constant f_{D_s}
• Measurement of the Branching Ratio for D_s->tau nu_tau Decays

Cited by in corpus (20)

• New Physics and CP Violation in Singly Cabibbo Suppressed D Decays
• Improved Measurement of cal{B}(D^+ --> mu^+ nu) and the Pseudoscalar Decay Constant f_{D^+}
• Precision Measurement of B(D+ -> mu+ nu) and the Pseudoscalar Decay Constant fD+
• B- to light-meson transition form factors
• Precision measurements of $B(D^{+}\to {\mu }^{+}{\nu }_{\mu })$, the pseudoscalar decay constant $f_{D^{+}}$, and the quark mixing matrix element $|V_{\mathrm{cd}}|$
• Pseudoscalar Decay Constants $f_D$ and $f_{D_s}$ in Lattice QCD with Exact Chiral Symmetry
• Effect of H^\pm on B^\pm\to τ^\pmν_τand D^\pm_s\to μ^\pmν_μ,τ^\pmν_τ
• Study of the leptonic decays of pseudoscalar $B,D$ and vector $B^{\ast },D^{\ast }$ mesons and of the semileptonic $B\to D$ and $B\to D^{\ast }$ decays
• D and D_{S} decay constants from QCD duality at three loops
• Direct measurement of the absolute branching fraction for $D^{+}\to {\bar{K}}^0{\mu }^{+}{\nu }_{\mu }$ and determination of $\Gamma (D^0\to K^{-}{\mu }^{+}{\nu }_{\mu })/\Gamma (D^{+}\to {\bar{K}}^0{\mu }^{+}{\nu }_{\mu })$
• Predictions from Lattice QCD
• Status of Charm Flavor Physics
• $D\to P(\pi ,K)$ helicity form factors within light-cone sum rule approach
• Probing the R-parity violating supersymmetric effects in the exclusive $c\to d/s\ell {\nu }_{\ell }$ decays
• Direct Measurements of Absolute Branching Fractions for D0 and D+ Inclusive Semimuonic Decays
• Search for D to phi l nu and measurement of the branching fraction for D to phi pi
• Electromagnetic structure and weak decay of pseudoscalar mesons in a light-front QCD-inspired model
• Testing lepton flavor universality in terms of data of BES III and charm-tau factory
• Charm Leptonic and Semileptonic Decays
• Static and dynamic properties of hadronic systems with heavy quarks b and c