  Evidence is presented for the decay $B_c+\rightarrow J/\psi 3\pi^+2\pi^-$
using proton-proton collision data, corresponding to an integrated luminosity
of 3fb$^{-1}$, collected with the LHCb detector. A signal yield of $32\pm8$
decays is found with a significance of 4.5 standard deviations. The ratio of
the branching fraction of the $B_c^+\rightarrow J/\psi 3\pi^+ 2\pi^-$ decay to
that of the $B_c^+ \rightarrow J/\psi \pi^+$ decay is measured to be $$
\frac{Br (B_c^+ \rightarrow J/\psi 3\pi^+2\pi^)}{Br (B_c^+ \rightarrow J/\psi
\pi^+)} = 1.74\pm0.44\pm0.24, $$ where the first uncertainty is statistical and
the second is systematic.

High Energy Physics - Experiment