A new measurement of the elastic scattering of 250-GeV/c negative pions by electrons provides form-factor results from 0.0368<q²<0.0940 (GeV/c)². These measurements determine the mean square pion radius to be 〈r_π²〉=0.439±0.030 fm² or 〈r_π²〉1/2=0.663±0.023 fm. Comparisons are made with previous elastic-scattering experiments as well as with results obtained from electroproduction experiments, e⁺e^- annihilation experiments, and phenomenological analyses.
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Dally et al. (1982) studied this question.
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