Asymmetries at the Tevatron

TL;DR

This paper reviews recent measurements of top and bottom quark pair production asymmetries at the Tevatron, highlighting discrepancies between experiments and the Standard Model, especially in top-quark asymmetry results.

Contribution

It provides a comprehensive summary of the latest experimental results on quark pair asymmetries, including new measurements of bottom-quark asymmetry and comparisons across experiments.

Findings

CDF observes a discrepancy in top-quark asymmetry measurements.

D0 results align with Standard Model predictions.

Bottom-quark asymmetry results are consistent with zero and the Standard Model.

Abstract

In this report, we summarize the latest results of the top-quark pair production asymmetry and present the new result of bottom-quark pair production asymmetry. By looking at the results obtained by the CDF experiment, one can see a discrepancy in both $t\bar{t}$ inclusive and lepton-based measurements. The D0 results of the $t\bar{t}$ production asymmetry are compatible with the standard-model predictions as well as with the CDF results. The CDF measurement of $b\bar{b}$ production asymmetry presents consistency with both zero and with the standard-model predictions.