A Search for Neutral Baryon Resonances Below Pion Threshold
  The reaction p(e,e^{prime}pi^+)X^0 was studied with two high resolution magnetic spectrometers to search for narrow baryon resonances. A missing mass resolution of 2.0 MeV was achieved.   A search for structures in the mass region of 0.97 < M_{X^0} < 1.06 GeV yielded no significant signal. The yield ratio of p(e,e^{prime}pi^+)X^0/p(e,e^{prime}pi^+)n was determined to be (-0.35 +/- 0.35) times 10^{-3} at 1.004 GeV and (0.34 +/- 0.42) times 10^{-3} at 1.044 GeV. 
X. Jiang, R. Gilman, R. Ransome, P. Markowitz, T.-H. Chang, C.-C.   Chang, G.A. Peterson, D.W. Higinbotham, M.K. Jones, N. L...