References
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We use units such thath=c=m π =1.
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However our value of Imf +0 does agree with their value within the stated errors, so we may expect the NO amplitude to satisfy our condition.
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The error estimate is based on experimental uncertainties in determinations of the pion electromagnetic form factor.
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Epstein, G.N., McKellar, B.H.J. Consistency conditions for the\({\mathcal{N}}\overline {\mathcal{N}} \to \pi \pi \) helicity amplitudeshelicity amplitudes. Lett. Nuovo Cimento 8, 177–181 (1973). https://doi.org/10.1007/BF02906228
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DOI: https://doi.org/10.1007/BF02906228