Review of Top Quark Physics Results
R. Kehoe, M. Narain, A. Kumar
TL;DR
This review synthesizes theoretical and experimental progress in top quark physics, emphasizing its role as a probe of strong and electroweak interactions and as a handle on Higgs-sector constraints. It surveys production mechanisms (ttbar via QCD and single-top via electroweak), precision mass measurements, and top quark properties, including searches for non-standard production and decay. The authors highlight the first direct evidence for electroweak top production and the resulting determination of |V_tb|, along with ongoing improvements from Tevatron Run II data. The work underscores how top-quark studies test the SM, constrain new physics, and guide future high-energy programs.
Abstract
As the heaviest known fundamental particle, the top quark has taken a central role in the study of fundamental interactions. Production of top quarks in pairs provides an important probe of strong interactions. The top quark mass is a key fundamental parameter which places a valuable constraint on the Higgs boson mass and electroweak symmetry breaking. Observations of the relative rates and kinematics of top quark final states constrain potential new physics. In many cases, the tests available with study of the top quark are both critical and unique. Large increases in data samples from the Fermilab Tevatron have been coupled with major improvements in experimental techniques to produce many new precision measurements of the top quark. The first direct evidence for electroweak production of top quarks has been obtained, with a resulting direct determination of $V_{tb}$. Several of the properties of the top quark have been measured. Progress has also been made in obtaining improved limits on potential anomalous production and decay mechanisms. This review presents an overview of recent theoretical and experimental developments in this field. We also provide a brief discussion of the implications for further efforts.