Breit-Wigner formalism for non-Abelian theories
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Breit-Wigner formalism for non-Abelian theories

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Breit-Wigner formalism for non-Abelian theories

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Papavassiliou, Joannis
This document is a artículoDate2003

Este documento está disponible también en : http://hdl.handle.net/10550/43008
The consistent description of resonant transition amplitudes within the framework of perturbative field theories necessitates the definition and resummation of off-shell Green's functions, which must respect several crucial physical requirements. In particular, the generalization of the usual Breit-Wigner formalism in a non-Abelian context constitutes a highly non-trivial problem, related to the fact that the conventionally defined Green's functions are unphysical. We briefly review the main field-theoretical difficulties arising when attempting to use such Green's functions outside the confines of a fixed order perturbative calculation, and explain how this task has been successfully accomplished in the framework of the pinch technique.

    Papavassiliou, Joannis 2003 Breit-Wigner formalism for non-Abelian theories Journal of Physics G-Nuclear and Particle Physics 29 1 153 159
http://dx.doi.org/10.1088/0954-3899/29/1/316

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