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Partial wave analysis of J/psi ---> p anti-p pi0

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May, 2009
15 pages
Published in:
  • Phys.Rev.D 80 (2009) 052004
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Abstract: (arXiv)
Using a sample of 58 million J/ψJ/\psi events collected with the BESII detector at the BEPC, more than 100,000 J/ψ→ppˉπ0J/\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/ψ→ppˉπ0)=(1.33±0.02±0.11)×10−3Br(J/\psi \to p \bar p \pi^0)=(1.33 \pm 0.02 \pm 0.11) \times 10^{-3}. A long-sought `missing' N∗N^*, first observed in J/ψ→pnˉπ−J/\psi \to p \bar n \pi^-, is observed in this decay too, with mass and width of 2040−4+3±252040_{-4}^{+3}\pm 25 MeV/c2^2 and 230−8+8±52230_{-8}^{+8}\pm 52 MeV/c2^2, respectively. Its spin-parity favors 3/2+{3/2}^+. The masses, widths, and spin-parities of other N∗N^* states are obtained as well.
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  • 12.38.Qk
  • 14.20.Gk
  • 13.25.Gv
  • 14.40.Cs
  • electron positron: annihilation
  • J/psi(3100): hadronic decay
  • J/psi(3100): branching ratio
  • partial wave analysis
  • branching ratio
  • nucleon resonance: mass spectrum
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