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OMS-bar scheme of UV renormalization in the presence of unstable fundamental particles

M. L. Nekrasov
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Abstract

A generalization of the on-mass-shell scheme of UV renormalization (the OMS-bar scheme) to the case of presence of unstable fundamental particles (like W and Z bosons) is proposed. Its basic ingredients are as follows: (i) the renormalized mass coincides with a real part of the position of the complex pole of the corresponding propagator, (ii) the imaginary part of the on-shell self-energy coincides with the imaginary part of the complex pole position. The latter property implies the gauge-invariance of the imaginary part of the on-shell self-energy in the OMS-bar scheme and its connection with the lifetime of an unstable particle. Starting with the three-loops this connection becomes nontrivial.

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M. L. Nekrasov. 2002-02-08. OMS-bar scheme of UV renormalization in the presence of unstable fundamental particles. https://doi.org/10.1016/s0370-2693(02)01435-1

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