Study of N* production from J / Psi ---> p anti-p eta

Data are presented on the reaction J/ψ→p p ̄ η using 7.8×10 6 J/ψ triggers collected by the BEjing Spectrometer (BES). A partial wave analysis is performed. A clear enhancement near the pη( p ̄ η) threshold is observed. It is fitted with a J P = 1 2 − resonance with mass M =1530±10 MeV and width Γ =95±25 MeV. In addition, there is a peak around 1650 MeV with J P = 1 2 − preferred also, fitted with M =1647±20 MeV and Γ =145 +80 −45 MeV. These two N ∗ resonances are believed to be the two well established states, S 11 (1535) and S 11 (1650), respectively. It is the first partial wave study of the production of these resonances from J / ψ decays.

Note:

Postscript file, 11 pages

13.25.Gv
14.20.Gk
13.65.+i
electron positron: colliding beams
electron positron: annihilation
J/psi(3100): electroproduction
J/psi(3100): hadronic decay
partial wave analysis
nucleon resonance: mass
nucleon resonance: width

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