D-meson production ine+e−annihilation atEc.m.between 3.8 and 6.7 GeV

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Abstract

The Mark II detector at SPEAR has been used to study $D$-meson production in ${e}^{+}{e}^{\ensuremath{-}}$ annihilation at center-of-mass energies between 3.8 and 6.7 GeV. The neutral and charged $D$ mesons are identified from their ${K}^{\ensuremath{\mp}}{\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}$ and ${K}^{\ensuremath{\mp}}{\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}{\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}$ decay modes. Measurements of ${R}_{D}$ and of the inclusive differential cross section $s$ $\frac{d\ensuremath{\sigma}}{\mathrm{dz}}$ are presented. The quasi-two-body cross sections ${\ensuremath{\sigma}}_{D\overline{D}}$, ${\ensuremath{\sigma}}_{{D}^{*}\overline{D}}$, and ${\ensuremath{\sigma}}_{{D}^{*}{\overline{D}}^{*}}$ are derived from an overall fit to the $D$ recoil spectra. No evidence was found for the associated production of charmed mesons and charmed baryons.

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