  We present a preliminary measurement of the branching fraction for the decay
of the neutral $B$ meson into the final state J/$\psi\pi^+\pi^-$. The data set
contains approximately 56 million $B\bar{B}$ pairs produced at the
$\Upsilon(4S)$ resonance and recorded by the BaBar detector at the PEP-II
$e^+e^-$ collider. The result of this analysis is $\mathcal{B}(B^0\to
J/\psi\pi^+\pi^-$) = (5.0 $\pm$ 0.7 $\pm$ 0.6)$\times 10^{-5}$, where the first
error is statistical and the second is systematic.

High Energy Physics - Experiment