Equivalence of Covariant and Light-Front Perturbation Theory

Details Equivalence of Covariant and Light-Front Perturbation Theory Equivalence of Covariant and Light-Front Perturbation Theory

1996-10-15

arxiv.org/abs/hep-ph/9610361v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

3 pages latex, uses epsf, epsfig, wrapfig. To appear in the Proceedings of the 12th International Symposium on High-Energy Spi

Scientific paper

Light-Front Field Theory (LFFT) is a good candidate to describe bound states. In LFFT covariance is non-manifest. Burkardt and Langnau claim that, even for scattering amplitudes, rotational invariance is broken. We will take a different path of obtaining rules for light-front time-ordered diagrams. Covariance depends on the choice of a regulator $\alpha$. We need to apply some regularisation scheme to render physical amplitudes finite. This is done by applying minus regularisation. In this process all ambiguities related to the regulator $\alpha$ are removed. Therefore there is equivalence between the perturbative expansions of covariant and LFFT.

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