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Abstract
A method is proposed for dealing with the subtraction constant required in fixed- t dispersion relations for π ± electroproduction. The method requires a knowledge of the t-channel cut contribution (evaluated at the subtraction points s 0), which can be determined at k 2 = 0 using a gauge invariance sum rule. Estimates by this and other methods show that it is small (compared with the pion pole contribution) for − t ⪅ 1 GeV 2, and in particular it is irrelevant to determinations of the pion form factor using high-energy forward π + data.
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