Gauge-Independent W-Boson Partial Decay Widths
High Energy Physics - Phenomenology
2009-10-31 v2
Abstract
We calculate the partial decay widths of the W boson at one loop in the standard model using the on-shell renormalization scheme endowed with a gauge-independent definition of the Cabibbo-Kobayashi-Maskawa (CKM) mixing matrix. We work in gauge and explicitly verify that the final expressions are independent of the gauge parameters. Furthermore, we establish the relationship between the on-shell and definitions of the CKM matrix, both in its generic form and in the Wolfenstein parameterization. As a by-product of our analysis, we recover the beta function of the CKM matrix.
Keywords
Cite
@article{arxiv.hep-ph/0005060,
title = {Gauge-Independent W-Boson Partial Decay Widths},
author = {B. A. Kniehl and F. Madricardo and M. Steinhauser},
journal= {arXiv preprint arXiv:hep-ph/0005060},
year = {2009}
}
Comments
15 pages; reference added; input parameters updated according to 2000 PDG report; accepted for publication in Phys. Rev. D