We report the observation of the $X(3872)$ in the $J/\ensuremath{\psi}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ channel, with $J/\ensuremath{\psi}$ decaying to ${\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}$, in $p\overline{p}$ collisions at $\sqrt{s}=1.96\text{ }\text{ ...
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