142 research outputs found
Measurement of the e+e- --> D(*)+D(*)- cross-sections
In this paper we report the first measurement of processes. The cross-sections for e^+^e- \to D^{*+}D^{*-}
and at have been
measured to be and , respectively. We set an upper limit on the cross-section of e+e-
--> D+ D- of at the 90% confidence level. In addition we
have measured the fraction of the final state in the
e+e- --> D*+ D*- reaction to be . The analysis is performed using
of data collected by the Belle detector at the
asymmetric collider KEKB.Comment: 10 pages, 3 figures. Paper submitted to the EPS2003 conference Typo
in DD* helicity analysis is corrected in the second draf
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