Complex-mass scheme and perturbative unitarity
High Energy Physics - Phenomenology
2015-06-12 v1 High Energy Physics - Theory
Abstract
We derive cutting rules for loop integrals containing propagators with complex masses. Using a field-theoretical model of a heavy vector boson interacting with a light fermion, we demonstrate that the complex-mass scheme respects unitarity order by order in a perturbative expansion provided that the renormalized coupling constant remains real.
Cite
@article{arxiv.1211.1684,
title = {Complex-mass scheme and perturbative unitarity},
author = {T. Bauer and J. Gegelia and G. Japaridze and S. Scherer},
journal= {arXiv preprint arXiv:1211.1684},
year = {2015}
}
Comments
Accepted for publication in International Journal of Modern Physics A