Top Quark Studies at DO

Reinhild Yvonne Peters

doi:10.1088/1742-6596/556/1/012032

Abstract

Years after its discovery in 1995 by CDF and D0, the top quark still undergoes intense investigations at the Tevatron. Using up to the full Run II data sample, new measurements of top quark production and properties by the D0 Collaboration are presented. In particular, the first observation of single top quark s-channel production, the measurement of differential tt̄ distributions, forward-backward tt̄ asymmetry, a new measurement of the top quark mass, and a measurement of the top quark charge are discussed.

Highlights

The top quark, discovered in 1995 by the CDF and D0 Collaborations at the Fermilab Tevatron collider, is the heaviest known elementary particle [1, 2]
It is believed to play a special role in electroweak symmetry breaking and provide a window to physics beyond the standard model (SM)
Studies in Single Top Quark Production Top quarks can be produced in pairs via the strong interaction, or singly via the electroweak interaction

Summary

Introduction

The top quark, discovered in 1995 by the CDF and D0 Collaborations at the Fermilab Tevatron collider, is the heaviest known elementary particle [1, 2]. 2. Studies in Single Top Quark Production Top quarks can be produced in pairs via the strong interaction, or singly via the electroweak interaction. Studies in Single Top Quark Production Top quarks can be produced in pairs via the strong interaction, or singly via the electroweak interaction The latter occurs via s-channel, t-channel and Wt-channel production. In 2009, CDF and D0 reported first observation of single top quark production [4, 5], where the s- and t-channel were measured together. The s-channel was observed by performing a combination of CDF and D0 measurements. A multivariate discriminant is build to separate s-channel signal from background In this analysis, the t-channel single top production cross section was set to its SM value.

Studies in Top Quark Pair Production

Conclusion