Antideuteron production inΥ(nS)decays and the nearby continuum

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Abstract

Using CLEO data, we study the production of the antideuteron, $\overline{d}$, in $\ensuremath{\Upsilon}(nS)$ resonance decays and the nearby continuum. The branching ratios obtained are ${\mathcal{B}}^{\mathrm{dir}}(\ensuremath{\Upsilon}(1S)\ensuremath{\rightarrow}\overline{d}X)=(3.36\ifmmode\pm\else\textpm\fi{}0.23\ifmmode\pm\else\textpm\fi{}0.25)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5}$, $\mathcal{B}(\ensuremath{\Upsilon}(1S)\ensuremath{\rightarrow}\overline{d}X)=(2.86\ifmmode\pm\else\textpm\fi{}0.19\ifmmode\pm\else\textpm\fi{}0.21)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5}$, and $\mathcal{B}(\ensuremath{\Upsilon}(2S)\ensuremath{\rightarrow}\overline{d}X)=(3.37\ifmmode\pm\else\textpm\fi{}0.50\ifmmode\pm\else\textpm\fi{}0.25)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5}$, where the ``dir'' superscript indicates that decays produced via reannihilation of the $b\overline{b}$ pair to a ${\ensuremath{\gamma}}^{*}$ are removed from both the signal and the normalizing number of $\ensuremath{\Upsilon}(1S)$ decays in order to isolate direct decays of the $\ensuremath{\Upsilon}(1S)$ to $ggg$, $gg\ensuremath{\gamma}$. Upper limits at 90% C.L. are given for $\mathcal{B}(\ensuremath{\Upsilon}(4S)\ensuremath{\rightarrow}\overline{d}X)<1.3\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5}$, and continuum production $\ensuremath{\sigma}({e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}\overline{d}X)<0.031\text{ }\text{ }\mathrm{pb}$. The $\ensuremath{\Upsilon}(2S)$ data is also used to extract a limit on ${\ensuremath{\chi}}_{bJ}\ensuremath{\rightarrow}\overline{d}X$. The results indicate enhanced deuteron production in $ggg$, $gg\ensuremath{\gamma}$ hadronization compared to ${\ensuremath{\gamma}}^{*}\ensuremath{\rightarrow}q\overline{q}$. Baryon number compensation is also investigated with the large $\ensuremath{\Upsilon}(1S)\ensuremath{\rightarrow}\overline{d}X$ sample.

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