Measurements of theDsJResonance 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 $\sqrt{s}=10.6\mathrm{G}\mathrm{e}\mathrm{V}$. The analysis is based on an $86.9\mathrm{f}{\mathrm{b}}^{\mathrm{-}\mathrm{1}}$ data sample collected with the Belle detector at KEKB. We determine the masses to be $M\mathbf{(}{D}_{sJ}^{+}(2317)\mathbf{)}=2317.2\pm 0.5(\mathrm{s}\mathrm{t}\mathrm{a}\mathrm{t})\pm 0.9(\mathrm{s}\mathrm{y}\mathrm{s}\mathrm{t})\mathrm{M}\mathrm{e}\mathrm{V}/c^2$ and $M\mathbf{(}{D}_{sJ}^{+}(2457)\mathbf{)}=2456.5\pm 1.3(\mathrm{s}\mathrm{t}\mathrm{a}\mathrm{t})\pm 1.3(\mathrm{s}\mathrm{y}\mathrm{s}\mathrm{t})\mathrm{M}\mathrm{e}\mathrm{V}/c^2$. 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 $D_{sJ}(2457)$.