Abstract

Assuming a certain continuity property, we prove, using the old results of Itzykson and Martin, that, except for an obvious ambiguity, there are only at most two amplitudes reproducing an elastic differential cross section at a given energy.

Highlights

  • Assuming a certain continuity property, we prove, using the old results of Itzykson and Martin, that, except for an obvious ambiguity, there are only at most two amplitudes reproducing an elastic differential cross section at a given energy

  • We consider only the situation where the scattering amplitude is an entire function of order 1

  • We do not believe this because the differential cross section remains continuous at the limit

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Summary

HISTORICAL INTRODUCTION

Given a differential cross section at one energy in the elastic region, can one find the scattering amplitudes? We restrict ourselves to the spinless case. Martin [6] assuming that there is a finite number of partial waves and showing that if the cross section is less than 1.38, the solution is unique. Martin [6] undertook a different approach, assuming that the scattering amplitude is a genuine entire function, i.e., not a polynomial, and succeeded to prove that in most cases there are not more than 2 solutions. We modify a polynomial amplitude, to make it an entire function and succeed to prove that for polynomial amplitudes of arbitrarily large degree there are only 2 solutions. We move to amplitudes with infinite number of partial waves and succeed, we believe, in proving that there are only 2 solutions

LECTURE ON ENTIRE FUNCTIONS
AMBIGUITIES FOR POLYNOMIAL AMPLITUDES
AMBIGUITIES FOR NONPOLYNOMIAL AMPLITUDES
CONCLUDING REMARKS
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