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We study the decay$\bar{B}^{0}\rightarrow\Lambda_{c}^{+}\bar{p}\pi^{+}\pi^{-}$, reconstructingthe \Lambda_{c}^{+} baryon in the $p K^{-}\pi^{+}$ mode, using a data sample of$467\times 10^{6}$ $B\bar{B}$ pairs collected with the BaBar detector at thePEP-2 storage rings at SLAC. We measure branching fractions for decays withintermediate $\Sigma_{c}$ baryons to be ${\calB}[\bar{B}^{0}\rightarrow\Sigma_{c}(2455)^{++}\bar{p}\pi^{-}]=(21.3 \pm 1.0 \pm1.0 \pm 5.5) \times 10^{-5}$, ${\calB}[\bar{B}^{0}\rightarrow\Sigma_{c}(2520)^{++}\bar{p}\pi^{-}]=(11.5\pm 1.0 \pm0.5 \pm 3.0)\times 10^{-5}$, ${\calB}[\bar{B}^{0}\rightarrow\Sigma_{c}(2455)^{0}\bar{p}\pi^{+}]=(9.1 \pm 0.7 \pm0.4 \pm 2.4)\times10^{-5}$, and ${\calB}[\bar{B}^{0}\rightarrow\Sigma_{c}(2520)^{0}\bar{p}\pi^{+}]= (2.2 \pm 0.7 \pm0.1\pm 0.6) \times 10^{-5}$, where the uncertainties are statistical,systematic, and due to the uncertainty on the$\Lambda_{c}^{+}\rightarrow\proton\Km\pi^{+}$ branching fraction, respectively.For decays without $\Sigma_{c}(2455)$ or $\Sigma_{c}(2520)$ resonances, wemeasure ${\calB}[\bar{B}^{0}\rightarrow\Lambda_{c}^{+}\bar{p}\pi^{+}\pi^{-}]_{\mathrm{non-\Sigma_{c}}}=(79\pm 4 \pm 4 \pm 20)\times10^{-5}$. The total branching fraction is determinedto be ${\calB}[\bar{B}^{0}\rightarrow\Lambda_{c}^{+}\bar{p}\pi^{+}\pi^{-}]_{\mathrm{total}}=(123\pm 5 \pm 7 \pm 32)\times10^{-5}$. We examine multibody mass combinations inthe resonant three-particle $\Sigma_{c}\bar{p}\pi$ final states and in thefour-particle $\Lambda_{c}^{+}\bar{p}\pi^{+}\pi^{-}$ final state, and observedifferent characteristics for the $\bar{p}\pi$ combination in neutral versusdoubly-charged $\Sigma_{c}$ decays.

Study of the decay $\bar{B}^{0}\rightarrow\Lambda_{c}^{+}\bar{p}\pi^{+}\pi^{-}$ and its intermediate states