Weak mixing angle at low energies
High Energy Physics - Phenomenology
2009-11-10 v2 High Energy Physics - Experiment
Abstract
We determine the weak mixing angle in the MS-bar scheme at energy scales relevant for present and future low energy electroweak measurements. We relate the renormalization group evolution of the weak mixing angle to the corresponding evolution of the QED coupling and include higher-order terms in alpha_s and alpha that had not been treated in previous analyses. We also up-date the analysis of non-perturbative hadronic contributions and argue that the associated uncertainty is small compared to anticipated experimental errors. The resulting value of the low-energy weak mixing angle is sin^2 theta_W (0) = 0.23867 +- 0.00016.
Keywords
Cite
@article{arxiv.hep-ph/0409169,
title = {Weak mixing angle at low energies},
author = {Jens Erler and Michael J. Ramsey-Musolf},
journal= {arXiv preprint arXiv:hep-ph/0409169},
year = {2009}
}
Comments
21 pages; 1 figure and some references added, some changes in text; final version as published