Low-Energy Measurements of the Weak Mixing Angle

Author:

Kumar K.S.1,Mantry Sonny2,Marciano W.J.3,Souder P.A.4

Affiliation:

1. Department of Physics, University of Massachusetts, Amherst, Massachusetts 01003;

2. Argonne National Laboratory and Department of Physics and Astronomy, Northwestern University, Evanston, Illinois 60208

3. Physics Department, Brookhaven National Laboratory, Upton, New York 11973

4. Physics Department, Syracuse University, Syracuse, New York 13244

Abstract

We review the status of precision measurements of weak neutral-current interactions, mediated by the Z0 boson, at Q2≪M2Z. They can be used to extract values for the weak mixing angle [Formula: see text], a fundamental parameter of the [Formula: see text] 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 providing 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 the sensitivities of planned and proposed measurements with physics beyond the Standard Model.

Publisher

Annual Reviews

Subject

Nuclear and High Energy Physics

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