Partial wave analysis of $J/\ensuremath{\psi}\ensuremath{\rightarrow}p\overline{p}{\ensuremath{\pi}}^{0}$

Partial wave analysis of $J / ψ \to p \bar{p} π^{0}$

M. Ablikim et al. (BES Collaboration)

Phys. Rev. D 80, 052004 – Published 17 September 2009

Abstract

Using a sample of 58 million $J / ψ$ events collected with the BESII detector at the BEPC, more than 100 000 $J / ψ \to p \bar{p} π^{0}$ events are selected, and a detailed partial wave analysis is performed. The branching fraction is determined to be $Br (J / ψ \to p \bar{p} π^{0}) = (1.33 \pm 0.02 \pm 0.11) \times 10^{- 3}$ . A long-sought missing $N^{*}$ , first observed in $J / ψ \to p \bar{n} π^{-}$ , 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 ${\frac{3}{2}}^{+}$ . The masses, widths, and spin parities of other $N^{*}$ states are obtained as well.