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Direct measurements of the non-DD¯cross sectionσψ(3770)→non−DD¯atEcm=3.773 GeVand the branching fraction forψ(3770)→non−DD¯

Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D, Particles, fields, gravitation, and cosmology2007Vol. 76(12)

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Abstract

By analyzing the data collected at the center-of-mass energy ${E}_{\mathrm{cm}}=3.773\text{ }\text{ }\mathrm{GeV}$ and below the $D\overline{D}$ meson pair production threshold with the BES-II detector at the BEPC Collider, we directly measured the observed non-$D\overline{D}$ cross section of $\ensuremath{\psi}(3770)$ decay to be ${\ensuremath{\sigma}}_{\ensuremath{\psi}(3770)\ensuremath{\rightarrow}\mathrm{non}\mathrm{\text{\ensuremath{-}}}D\overline{D}}^{\mathrm{obs}}=(0.95\ifmmode\pm\else\textpm\fi{}0.35\ifmmode\pm\else\textpm\fi{}0.29)\text{ }\text{ }\mathrm{nb}$ at ${E}_{\mathrm{cm}}=3.773\text{ }\text{ }\mathrm{GeV}$, and the branching fraction $BF[\ensuremath{\psi}(3770)\ensuremath{\rightarrow}\mathrm{non}\mathrm{\text{\ensuremath{-}}}D\overline{D}]=(13.4\ifmmode\pm\else\textpm\fi{}5.0\ifmmode\pm\else\textpm\fi{}3.6)%$ for inclusive non-$D\overline{D}$ decay of $\ensuremath{\psi}(3770)$. We also determined the cross section for $D\overline{D}$ meson pair production to be ${\ensuremath{\sigma}}_{D\overline{D}}^{\mathrm{obs}}=(6.12\ifmmode\pm\else\textpm\fi{}0.37\ifmmode\pm\else\textpm\fi{}0.23)\text{ }\text{ }\mathrm{nb}$ at ${E}_{\mathrm{cm}}=3.773\text{ }\text{ }\mathrm{GeV}$.

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Abstract

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