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APS » Journals » Physical Review Letters » Observation of $D_{s1}$(2536)$^{+} \rightarrow$ $D^{+} \pi^{-}K^{+}$ and angular decomposition of $D_{s1}$(2536)$^{+} \rightarrow D\ast ^{+} K^{0}_{S}$

January 2008, to be published in Physical Review D1

Observation of $D_{s1}$(2536)$^{+} \rightarrow$ $D^{+} \pi^{-}K^{+}$ and angular decomposition of $D_{s1}$(2536)$^{+} \rightarrow D\ast ^{+} K^{0}_{S}$
V. Balagura \fIet al.\fP

Using 462~fb$^{-1}$ of $e^+e^-$ annihilation data recorded by the Belle detector, we report the first observation of the decay $D_{s1}(2536)^+ \rightarrow D^+ \pi^- K^+$. The ratio of branching fractions $\frac{\mathcal{B}(D_{s1}(2536)^+\rightarrow D^+\pi^-K^+)}{\mathcal{B}(D_{s1}(2536)^+\rightarrow D^{*+}K^0)}$ is measured to be $(3.27\pm 0.18\pm0.37)\%$. We also study the angular distributions in the $D_{s1}(2536)^+\rightarrow D^{*+}K^0_S$ decay and measure the ratio of D- and S-wave amplitudes. The S-wave dominates, with a partial width of $\Gamma_S/\Gamma_{\mathrm{total}}=0.72\pm0.05\pm0.01$.

© 2008 The American Physical Society.