Measurement of the e+e- --> D(*)+D(*)- cross-sections

Abstract

In this paper we report the first measurement of $e^{+}{e}^{-}\to D^{(\ast )+}{D}^{(\ast )-}$ processes. The cross-sections for $e^+^e- \to D^{*+}D^{*-}$ and $e^{+}{e}^{-}\to D^{+}{D}^{\ast -}$ at $\sqrt{s}=10.58\mathrm{GeV}/c^2$ have been measured to be $0.65\pm 0.04\pm 0.07\mathrm{pb}$ and $0.71\pm 0.05\pm 0.09\mathrm{pb}$, respectively. We set an upper limit on the cross-section of e+e- --> D+ D- of $0.04\mathrm{pb}$ at the 90% confidence level. In addition we have measured the fraction of the $D_T^{\ast \pm }{D}_L^{\ast \mp }$ final state in the e+e- --> D*+ D*- reaction to be $(97\pm 5)$. The analysis is performed using $88.9{\mathrm{fb}}^{-1}$ of data collected by the Belle detector at the $e^{+}{e}^{-}$ asymmetric collider KEKB.

10 pages, 3 figures. Paper submitted to the EPS2003 conference Typo in DD* helicity analysis is corrected in the second draft

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