Partial wave analysis of J/psi to p pbar pi0

Abstract

Using a sample of 58 million $J/\psi$ events collected with the BESII detector at the BEPC, more than 100,000 $J/\psi \to p\bar{p}{\pi }^0$ events are selected, and a detailed partial wave analysis is performed. The branching fraction is determined to be $Br(J/\psi \to p\bar{p}{\pi }^0)=(1.33\pm 0.02\pm 0.11)\times 10^{-3}$. A long-sought `missing' $N^{\ast }$, first observed in $J/\psi \to p\bar{n}{\pi }^{-}$, is observed in this decay too, with mass and width of $2040_{-4}^{+3}\pm 25$ MeV/c${}^2$ and $230_{-8}^{+8}\pm 52$ MeV/c${}^2$, respectively. Its spin-parity favors ${3/2}^{+}$. The masses, widths, and spin-parities of other $N^{\ast }$ states are obtained as well.

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References in corpus (2)

• Direct observation of the strange b baryon Xi_b^{-}
• Observation of the doubly strange b baryon Omega_b-

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