Study of intermediate two-body decays in ${\bar{B}}^0\to {\Sigma }_c(2455{)}^0\bar{p}{\pi }^{+}$

Abstract

We present results of a detailed study of the three-body ${\bar{B}}^0\to {\Sigma }_c(2455{)}^0\bar{p}{\pi }^{+}$ decay. A significant enhancement of signal events is observed in the $\bar{p}{\pi }^{+}$ mass system near $1.5\mathrm{GeV}/c^2$ that is consistent with the presence of an intermediate baryonic resonance ${\bar{N}}^0$, where ${\bar{N}}^0$ is the $\bar{N}(1440{)}^0{P}_{11}$ or $\bar{N}(1535{)}^0{S}_{11}$ state, or an admixture of the two states. We measure the product $\mathcal{B}({\bar{B}}^0\to {\Sigma }_c(2455{)}^0{\bar{N}}^0)\times \mathcal{B}({\bar{N}}^0\to \bar{p}{\pi }^{+})$= ($0.80\pm 0.15(stat.)\pm 0.14(syst.)\pm 0.21$)$\times 10^{-4}$, where the last error is due to the uncertainty in $\mathcal{B}({\Lambda }_c^{+}\to p{K}^{-}{\pi }^{+})$. The significance of the signal is 6.1 standard deviations. This analysis is based on 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.

15 pages, 7 figures, submitted to Physics Letters B