Decay Constants $f_{D_s^*}$ and $f_{D_s}$ from ${\bar{B}}^0\to D^+ l^- {\barν}$ and ${\bar{B}}^0\to D^+ D_s^{-(*)}$ Decays

Y. -Y. Keum

paper

Decay Constants $f_{D_{s}^{}}$ and $f_{D_{s}}$ from $B ˉ^{0} \to D^{+} l^{-} ν ˉ$ and $B ˉ^{0} \to D^{+} D_{s}^{- ()}$ Decays

arXiv:hep-ph/9810369

Abstract

We calculate the decay constant of $D_{s}$ and $D_{s}^{*}$ with $\bar{B}^0 \ra D^{+}\ell^{-}ν$ and $\bar{B}^0 \ra D^{+}D_s^{-(*)}$ decays. In our analysis we assume that factorization ansatz works and used two different form factor behaviours (constant and monopole-type) for $F_{0} (q^{2})$ . We also consider the QCD-penguin contributions in hadronic decays within the NDR renormalization scheme at NLO calculation. We estimate the decay constant of the $D_{s}$ meson to be $219 \pm 46 M e V$ for (pole/pole)-type form factor and $239 \pm 50$ $M e V$ for (pole/constant)-type form factor. For $D_{s}^{*}$ meson, we predict $f_{D_{s}^{*}} = 336 \pm 79 M e V$ , and $f_{D_{s}^{*}} / f_{D_{s}} = 1.41 \pm 0.41$ for (pole/constant)-type form factor.

17 pages, no figure

Decay Constants fDs∗​​ and fDs​​ from Bˉ0→D+l−νˉ and Bˉ0→D+Ds−(∗)​ Decays

Abstract

Decay Constants $f_{D_{s}^{}}$ and $f_{D_{s}}$ from $B ˉ^{0} \to D^{+} l^{-} ν ˉ$ and $B ˉ^{0} \to D^{+} D_{s}^{- ()}$ Decays