Weak mixing angle at low energies

Details Weak mixing angle at low energies Weak mixing angle at low energies

2004-09-14

arxiv.org/abs/hep-ph/0409169v2

Phys.Rev. D72 (2005) 073003

Physics

High Energy Physics

High Energy Physics - Phenomenology

21 pages; 1 figure and some references added, some changes in text; final version as published

Scientific paper

10.1103/PhysRevD.72.073003

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.

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