Measurements of the $D_{sJ}$ resonance properties

Abstract

We report measurements of the properties of the $D_{sJ}^{+}(2317)$ and $D_{sJ}^{+}(2457)$ resonances produced in continuum $e^{+}{e}^{-}$ annihilation near $\sqrt{s}=10.6\mathrm{GeV}$. The analysis is based on an $86.9\mathrm{f}{\mathrm{b}}^{-1}$ data sample collected %at and 60 MeV below the ${\rm Y}(4S)$ resonance with with the Belle detector at KEKB. We determine the masses to be $M(D_{sJ}^{+}(2317))=2317.2\pm 0.5(\mathrm{stat})\pm 0.9(\mathrm{syst})\mathrm{MeV}/c^2$ and $M(D_{sJ}^{+}(2457))=2456.5\pm 1.3(\mathrm{stat})\pm 1.3(\mathrm{syst})\mathrm{MeV}/c^2$. We observe the radiative decay mode $D_{sJ}^{+}(2457)\to D_s^{+}\gamma$ and the dipion decay mode $D_{sJ}^{+}(2457)\to D_s^{+}{\pi }^{+}{\pi }^{-}$, and determine their branching fractions. No corresponding decays are observed for the $D_{sJ}(2317)$ state. These results are consistent with the spin-parity assignments of $0^{+}$ for the $D_{sJ}(2317)$ and $1^{+}$ for the $D_{sJ}(2457)$.

5 pages, 6 figures; Added content, updated and paper submitted to PRL

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