Study of intermediate two-body decays in B¯0→Σc(2455)0p¯π+

We present results of a detailed study of the three-body B¯0→Σc(2455)0p¯π+ decay. A significant enhancement of signal events is observed in the p¯π+ invariant mass distribution near 1.5 GeV/c2 that is consistent with the presence of an intermediate baryonic resonance N¯0, where N¯0 is the N¯(1440)0P11 or N¯(1535)0S11 state, or an admixture of the two states. We measure the product B(B¯0→Σc(2455)0N¯0)×B(N¯0→p¯π+)=(0.80±0.15(stat.)±0.14(syst.)±0.21)×10−4, where the last error is due to the uncertainty in B(Λc+→pK−π+). 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 ϒ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e− collider.