Measurements of the $D_{sJ}$ resonance properties

We report measurements of the properties of the $D_{sJ}^+(2317)$ and $D_{sJ}^+(2457)$ resonances produced in continuum $e^+ e^-$ annihilation near $\sqrt{s}=10.6$ GeV. The analysis is based on an 86.9 $fb^{-1}$ data sample collected %at and 60 MeV below the $\Upsilon(4S)$ resonance with with the Belle detector at KEKB. We determine the masses to be $M(D_{sJ}^+(2317)) = 2317.2 \pm 0.5(\mathrm{stat}) \pm 0.9(\mathrm{syst})$ and $M(D_{sJ}^+(2457))=2456.5 \pm 1.3(\mathrm{stat}) \pm 1.1(\mathrm{syst})$. We measure a cross section times branching fraction ratio of $\sigma(D_{sJ}^+(2457))\times Br(D_{sJ}^+(2457) \to D_s^{*+} \pi^0) / \sigma(D_{sJ}^+(2317))\times Br(D_{sJ}^+(2317) \to D_s^+ \pi^0) =0.26 \pm 0.05(\mathrm{stat}) \pm 0.06(\mathrm{syst})$. We also observe the radiative decay mode $D_{sJ}^+(2457) \to D_s^+ \gamma$ and determine $Br(D_{sJ}^+(2457) \to D_s^+ \gamma) /Br(D_{sJ}^+(2457) \to D_s^{*+} \pi^0) =0.63 \pm 0.15(\mathrm{stat}) \pm 0.15(\mathrm{syst})$. We set upper limits for the branching fractions of two other decay modes as $\sigma(D_{sJ}^+(2457))\times Br(D_{sJ}^+(2457) \to D_s^+ \pi^0) / \sigma(D_{sJ}^+(2317))\times Br(D_{sJ}^+(2317) \to D_s^+\pi^0) \leq 0.06$ (90% C.L.), and $(Br(D_{sJ}^+(2317) \to D_s^+ \gamma))/ (Br(D_{sJ}^+(2317) \to D_s^+ \pi^0)) \leq 0.05$ (90% C.L.).