Observation of two new $N^{\ast }$ resonances in $\psi (3686)\to p\bar{p}{\pi }^0$

Abstract

Based on 106$\times 10^6\psi (3686)$ events collected with the BESIII detector at the BEPCII facility, a partial wave analysis of $\psi (3686)\to p\bar{p}{\pi }^0$ is performed. The branching fraction of this channel has been determined to be $B(\psi (3686)\to p\bar{p}{\pi }^0)=(1.65\pm 0.03\pm 0.15)\times 10^{-4}$. In this decay, 7 $N^{\ast }$ intermediate resonances are observed. Among these $N^{\ast }$ resonances, two new resonances are significant, one $1/2^{+}$ resonance with a mass of $2300_{-30}^{+40}$${}_{-0}^{+109}$ $\mathrm{MeV}/c^2$ and width of $340_{-30}^{+30}$${}_{-58}^{+110}$ $\mathrm{MeV}/c^2$, and one $5/2^{-}$ resonance with a mass of $2570_{-10}^{+19}$${}_{-10}^{+34}$ $\mathrm{MeV}/c^2$ and width of $250_{-24}^{+14}$${}_{-21}^{+69}$ $\mathrm{MeV}/c^2$. For the remaining 5 $N^{\ast }$ intermediate resonances, the analysis yields mass and width values which are consistent with those from established resonances.

6 pages, 2 figures

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