Study of the charmed baryonic decays ${\bar{B}}^0\to {\Sigma }_c^{++}\bar{p}{\pi }^{-}$ and ${\bar{B}}^0\to {\Sigma }_c^0\bar{p}{\pi }^{+}$

Abstract

We study the three-body charmed baryonic decays ${\bar{B}}^0\to {\Sigma }_c^{++}\bar{p}{\pi }^{-}$ and ${\bar{B}}^0\to {\Sigma }_c^0\bar{p}{\pi }^{+}$ in the four-body final state ${\bar{B}}^0\to {\Lambda }_c^{+}\bar{p}{\pi }^{+}{\pi }^{-}$, using a data sample of 357 fb${}^{-1}$ accumulated at the ${\rm Y}(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^{+}{e}^{-}$ collider. We measure the branching fractions $\mathcal{B}({\bar{B}}^0\to {\Sigma }_c(2455{)}^{++}\bar{p}{\pi }^{-})$=$(2.1\pm 0.2\pm 0.3\pm 0.5)\times 10^{-4}$, $\mathcal{B}({\bar{B}}^0\to {\Sigma }_c(2455{)}^0\bar{p}{\pi }^{+})$=$(1.4\pm 0.2\pm 0.2\pm 0.4)\times 10^{-4}$, $\mathcal{B}({\bar{B}}^0\to {\Sigma }_c(2520{)}^{++}\bar{p}{\pi }^{-})$=$(1.2\pm\0.1\pm0.2\pm0.3)\times10^{-4}$ with statistical significances of 13.1, 9.5 and 7.2 standard deviations, respectively. The errors are statistical, systematic, and due to the uncertainty in $\mathcal{B}({\Lambda }_c^{+}\to p{K}^{-}{\pi }^{+})$, respectively. We also set an upper limit $\mathcal{B}({\bar{B}}^0\to {\Sigma }_c(2520{)}^0\bar{p}{\pi }^{+})<0.38\times 10^{-4}$ at the 90% confidence level. In addition, we obtain a non-resonant branching fraction of $(6.4\pm0.4\pm\0.9\pm1.7)\times10^{-4}$, and a total branching fraction of $(11.2\pm 0.5\pm 1.4\pm 2.9)\times 10^{-4}$ for ${\bar{B}}^0\to {\Lambda }_c^{+}\bar{p}{\pi }^{+}{\pi }^{-}$.

arXiv comment10pages, 3figures; submitted to the ICHEP06 Conference, Moscow, Russia, BELLE-CONF-0604, submitted to PRD

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