Phenomenological analysis of proton-proton and antiproton-proton elastic scattering at high energies / Analise fenomenologica dos espalhamentos elasticos proton-proton e antiproton-proton em altas energias

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

We present a study on proton-proton (pp) and antiproton-proton (¯pp) elastic scattering at high energies, with focus on the behavior of the total cross section, differential cross section and the parameter p (ratio between the real and the imaginary parts of the forward amplitude). These quantities are described by means of a model independent parametrization for the scattering amplitude, with explicit dependence not only on the momentum transfer but also on the collision energy. The formalism makes use of derivative dispersion relations so as to connect real and imaginary parts of the amplitude and, simultaneously, the crossed channels ( and ¯pp ) through analyticity properties. Simultaneous fits to total cross section, differential cross section and p data, from pp and ¯pp scattering, allow a good description of these quantities and also predictions for other quantities (in particular the slope parameter) and at other energies and momentum that did not take part in the fit procedure. From the fit results we extract the behavior of the profile, eikonal and inelastic overlap function as function of the energy and the impact parameter. We also present a discussion on the model independent predictions in the experimental context (running and planned experiments) as well as in the phenomenological context (some representative models for high-energy elastic scattering)

ASSUNTO(S)

dispersion relations elastic scattering interações de altas energias relações de dispersão high energy interactions espalhamento elastico

ACESSO AO ARTIGO

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