Precision Electroweak Measurements and ``New Physics''
William J. Marciano
TL;DR
The paper surveys precision electroweak measurements and their implications for the Standard Model and potential New Physics. It emphasizes the role of precise determinations of m_W, m_Z, m_t, alpha(m_Z), and radiative corrections in constraining the Higgs mass m_H and the oblique parameters S, T, U. A key result is a preference for a light Higgs near m_H ~ 100 GeV and tight limits on new dynamics, with no persistent evidence for new physics such as large S or low-scale W star states. The work also discusses a Zbb anomaly and outlines how future high-precision measurements could further probe beyond-Standard-Model scenarios.
Abstract
The status of several precisely measured electroweak parameters is reviewed. Natural relations among them are shown to constrain the Higgs mass, m_H, as well as various ``New Physics'' effects. Indications of an anomalous Zb anti-b coupling are discussed. Constraints on excited W^* bosons are given.