The total cross sections of π^± on protons in the momentum interval 2 to 7 GeV/c have been measured with high precision. The error fluctuations from point to point vary between 10 and 25 {μ}b. Two new pion-nucleon resonances, one in each of the two isotopic states, have been found at the following mass values: M1/2=2.65±0.01 GeV and M3/2=2.85±0.01 GeV. A search for other resonances at higher momenta is discussed.
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Citron et al. (1966) studied this question.
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