Summary
A general method for investigation of the scattering by practically arbitrary « nonphysical » potentials λV(r) with short range is given which is illustrated by the example of the nonrelativistic scattering but is applicable also, after corresponding modification, to the relativistic and Bethe-Salpeter potential scatterings. We obtain a Volterra integral equation for the partial wave function ϕλ(l,s,r) and an explicit form for the partial wave amplitudeF λ(l,s) which is convenient for investigation of the analytic properties ofF λ(l,s) with respect to different variables. One shows thatF λ(l,s) inevitably has a unmoving singularity of the root (and only root) type in the variable λ at the point λ=0 and, with the same inevitability, an essential singularity in the variables at infinity. This latter makes impossible both the Mandelstam and even the one-dimensional dispersion relations for the total amplitudeT λ(l, s). The situation for the realistic field theory scattering is discussed.
Riassunto
Si espone un metodo per lo studio dello scattering su potenziali « non flsici » λV(r), praticamente arbitrari, di breve portata che si illustra oon l’esempio dello scattering non relativistico, ma è anche applicabile dopo adatte modificazioni agli scattering relativistici e su potenziali di Bethe-Salpeter. Otteniamo un’azione integrale di Volterra per la funzione dell’onda parziale ϕλ(l,s,r) e una forma esplicita per l’ampiezza dell’onda parzialef λ(l, s) utile per l’indagine delle proprietà analitiche dif λ(l, s) rispetto alle differenti variabili. Si dimostra che fλ(l,s) ha inevitabilmente una singolarità immobile del tipo di una radice (e solo di tal tipo) nella variabile λ nel punto λ = 0 e, altrettanto inevitabilmente, una singolarità nella variabiles all’infinito. Quest’ultima rende impossibile sia le relazioni di dispersions di Mandelstam che quelle unidimensionali per l’ampiezza totaleT λ(l,s). Si discute la situazione che ne risulta per lo scattering reale nella teoria dei campi.
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An erratum to this article is available at http://dx.doi.org/10.1007/BF02756701.
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Lomsadze, Y.M. A general method, for investigation of the scattering by « nonphysical » potentials. Nuovo Cim 38, 1291–1302 (1965). https://doi.org/10.1007/BF02750606
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DOI: https://doi.org/10.1007/BF02750606