Improved measurements of $D_s$ meson decay constant and branching fractions of $D_s^{+}\to K^{-}{K}^{+}{\pi }^{+}$, $\bar{K}{}^0{K}^{+}$ and $\eta {\pi }^{+}$ decays from Belle

Abstract

We present preliminary absolute branching fraction measurements of leptonic $D_s^{+}$ decays to ${\mu }^{+}{\nu }_{\mu }$ and ${\tau }^{+}{\nu }_{\tau }$, and of hadronic $D_s^{+}$ decays to $K^{-}{K}^{+}{\pi }^{+}$, $\bar{K}{}^0{K}^{+}$ and $\eta {\pi }^{+}$. The results are obtained from a large data sample collected near the ${\rm Y}(4S)$ and ${\rm Y}(5S)$ resonances with the Belle detector at the KEKB asymmetric-energy $e^{+}{e}^{-}$ collider. We obtain the the branching fractions $\mathcal{B}(D_s^{+}\to {\mu }^{+}{\nu }_{\mu })=(0.528\pm 0.028\pm 0.019)$ and $\mathcal{B}(D_s^{+}\to {\tau }^{+}{\nu }_{\tau })=(5.70\pm 0.21{}_{-0.30}^{+0.31})$ which are combined to determine the $D_s$ decay constant $\fds=(255.0\pm4.2\pm5.0)$ MeV, where the first and second uncertainties are statistical and systematic, respectively. Branching fractions of hadronic decays are measured to be $\mathcal{B}(D_s^{+}\to K^{-}{K}^{+}{\pi }^{+})=(5.06\pm 0.15\pm 0.19)$, $\mathcal{B}(D_s^{+}\to \bar{K}{}^0{K}^{+})=(2.84\pm 0.12\pm 0.08)$ and $\mathcal{B}(D_s^{+}\to \eta {\pi }^{+})=(1.79\pm 0.14\pm 0.05)$.

26 pages, 6 figures, 6 tables, to appear in the proceedings of The 5th International Workshop on Charm Physics (Charm 2012), 14-17 May 2012, Honolulu, Hawai'i 96822

References in corpus (4)

• B- and D-meson decay constants from three-flavor lattice QCD
• Leptonic Decays of Charged Pseudoscalar Mesons - 2013
• Leptonic decays of charged pseudoscalar mesons - 2012
• Measurement of the Absolute Branching Fractions for $D_s^{-}\to {\ell }^{-}{\bar{\nu }}_{\ell }$ and Extraction of the Decay Constant $f_{D_s}$

Cited by in corpus (2)

• Report of the Quark Flavor Physics Working Group
• Leptonic $D_s$ decays at $B$-factories