Leptonic decays of the Ds meson

Abstract

The purely leptonic decays Ds -> tau nu and Ds -> mu nu are studied in a sample of four million hadronic Z decays collected with the ALEPH detector at the LEP e+e- collider from 1991 to 1995. The branching fractions are extracted from a combination of two analyses, one optimized to select Ds -> tau nu decays with tau -> e nu nubar or mu nu nubar, and the other optimized for Ds-> mu nu decays. The results are used to evaluate the Ds decay constant, within the Standard Model: fDs = [285 +- 19(stat) +- 40 (syst)] MeV

23 pages, 10 figures

References in corpus (2)

• Heavy Quark Physics on the Lattice
• Measurement of the Branching Ratio for D_s->tau nu_tau Decays

Cited by in corpus (18)

• Decay Constants of Heavy Vector Mesons in Relativistic Bethe-Salpeter Method
• Charm Meson Decays
• B, D and K decays
• Decay Constants of Heavy Meson of $0^{-}$ State in Relativistic Salpeter Method
• The B_s and D_s decay constants in 3 flavor lattice QCD
• Measurement of B(Ds+ -->ell+ nu) and the Decay Constant fDs From 600/pb of e+e- Annihilation Data Near 4170 MeV
• Constraints on charged Higgs bosons from D(s)+- -> mu+- nu and D(s)+- -> tau+- nu
• 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
• Present knowledge of the Cabibbo-Kobayashi-Maskawa matrix
• |V_{cd}|, |V_{cs}| and f_{D_s} from (semi) leptonic $D_{(s)}$-decays : signals of New Physics ?
• Direct Measurement of the Pseudoscalar Decay Constant fD+
• Measurement of B(D_S^+ --> ell^+ nu) and the Decay Constant f_D_{S^+}
• Measurement of the Branching Fraction for Inclusive Semileptonic B Meson Decays
• Determination of $f_{+}^K(0)$ and Extraction of $|V_{cs}|$ from Semileptonic $D$ Decays
• Probing the R-parity violating supersymmetric effects in the exclusive $c\to d/s\ell {\nu }_{\ell }$ decays
• Testing lepton flavor universality in terms of data of BES III and charm-tau factory
• Static and dynamic properties of hadronic systems with heavy quarks b and c
• Possible improvements on the mass of the tau neutrino using leptonic $D_s^{\pm }$ decays