The recent precise measurements of π-N scattering in the 3-3 energy range have been fitted by Rittenberg et al., using four different phenomenological resonance formulas. These fits yield masses in the range 1234 to 1231 MeV, with widths ranging from 112 to 120 MeV. We show that these fits, as well as an ND^-1 fit, all yield a nearly unique value for the position of the 3-3 pole in the S matrix at 1211-50i MeV.
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Ball et al. (1972) studied this question.
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