  Resonant formation of $d\mu t$ molecules in collisions of muonic tritium
($\mu t$) on D$_2$ was investigated using a beam of $\mu t$ atoms,
demonstrating a new direct approach in muon catalyzed fusion studies. Strong
epithermal resonances in $d\mu t$ formation were directly revealed for the
first time. From the time-of-flight analysis of $2036\pm 116$ $dt$ fusion
events, a formation rate consistent with $0.73\pm (0.16)_{meas} \pm
(0.09)_{model}$ times the theoretical prediction was obtained. For the largest
peak at a resonance energy of $0.423 \pm 0.037$ eV, this corresponds to a rate
of $(7.1 \pm 1.8) \times 10^9$ s$^{-1}$, more than an order of magnitude larger
than those at low energies.
