Abstract
Several methods of exploiting fixed- t analyticity are described and compared with each other. For the forward amplitude the predictions of the real parts from the total cross section data — including the new NAL data — and dispersion relations are found to be in good agreement with the Coulomb interference data. It is also discussed how the results depend on the assumptions on the asymptotic behaviour of the cross section. Furthermore, the conventional dispersion relation approach is compared with the method of analytic parametrization and with the differential operator method. For the non-forward directions, information on the amplitude is extracted from a dispersion relation for the slopes and from a relation between the phase and the modulus of the amplitude.
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