Measurements of the $D_{s J}$ Resonance Properties

We report measurements of the properties of the

D_{s J}^{+} (2317)

and

D_{s J}^{+} (2457)

resonances produced in continuum

e^{+} e^{-}

annihilation near

\sqrt{s} = 10.6 G e V

. The analysis is based on an

86.9 f b^{- 1}

data sample collected with the Belle detector at KEKB. We determine the masses to be

M (D_{s J}^{+} (2317)) = 2317.2 \pm 0.5 (s t a t) \pm 0.9 (s y s t) M e V / c^{2}

and

M (D_{s J}^{+} (2457)) = 2456.5 \pm 1.3 (s t a t) \pm 1.3 (s y s t) M e V / c^{2}

. We observe the radiative decay mode

D_{s J}^{+} (2457) \to D_{s}^{+} γ

and the dipion decay mode

D_{s J}^{+} (2457) \to D_{s}^{+} π^{+} π^{-}

and determine their branching fractions. No corresponding decays are observed for the

D_{s J} (2317)

state. These results are consistent with the spin-parity assignments of

0^{+}

for the

D_{s J} (2317)

and

1^{+}

for the

D_{s J} (2457)

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Measurements of theDsJResonance Properties