Low Energy Measurements of the Weak Mixing Angle

2013/02/28 by K. S. Kumar, Sonny Mantry, W. J. Marciano +1 · 1 citation
Physics and Astronomy · #hep-ex #hep-ph #nucl-ex

paper · pdf · doi:10.1146/annurev-nucl-102212-170556

published as Ann.Rev.Nucl.Part.Sci. 63 (2013) 237-267 · Review article, accepted for publication in Annual Review of Nuclear and Particle Science, Volume 63

arxiv created 2013/03/25 · arxiv updated 2013/10/29

Abstract

We review the status of precision measurements of weak neutral current interactions, mediated by the Z⁰ boson, at Q²≪ M_Z². They can be used to extract values for the weak mixing angle sin²θ_W, a fundamental parameter of the SU(2)_L× U(1)_Y electroweak sector of the Standard Model. Apart from providing a comprehensive test of the electroweak theory at the quantum loop level, such measurements allow indirect access to new physics effects at and beyond the TeV scale. After a theoretical introduction and a brief overview of the three most precise low Q² weak mixing angle determinations, we describe the ongoing experimental program and prospects for future more sensitive studies. We also compare sensitivities of planned and proposed measurements to physics beyond the Standard Model.

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