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The cross sections for D0D¯0, D+D− and DD¯ production by e+e− annihilation at the center-of-mass energy s=3.773 GeV have been directly measured with the BES-II detector at the BEPC collider. The measurement of the cross sections is made by analyzing both the singly tagged D events and the doubly tagged DD¯ events from the data sample of about 17.3 pb −1 collected at s=3.773 GeV. The observed...
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