Top Mass and Properties

TL;DR

This paper reviews the measurements of the top quark's mass and properties at the Tevatron, highlighting recent precise results and ongoing efforts to explore potential new physics beyond the Standard Model.

Contribution

It summarizes recent experimental measurements of the top quark mass and properties, emphasizing the progress and future prospects for precision studies at the Tevatron.

Findings

Top quark mass measured with less than 1% uncertainty.

Results on top quark charge, W helicity, and decay branching ratios are consistent with the Standard Model.

Ongoing data collection aims to improve the precision of top quark property measurements.

Abstract

The top quark was discovered in 1995. The top quark mass is now well measured at the Tevatron, with uncertainty getting below 1% of the top mass. The world average from last year was 170.9 $\pm$ 1.8 GeV/$c^2$. The new CDF measurement is 172 $\pm$ 1.2 (stat) $\pm$ 1.5 (sys) GeV/$c^2$, and D0 will soon present a new measurement. The top quark mass is an important parameter in the Standard Model, and should be measured as precisely as possible. To learn more about the top quark observed and study possible new physics, other properties also should be measured. At the Tevatron, the charge of the top quark can be measured directly. Examples of other properties studied and reported in this presentation are W helicity, top decay branching ratio to b ($R_b$), searches for $t \to H b$ and for flavor changing neutral current (FCNC). The results are all consistent with the Standard Model within current statistics. With significantly more data being collected at the Tevatron, precision measurements of the top properties are just starting.