Top anti-top Asymmetries at the Tevatron and the LHC

TL;DR

This paper reviews recent measurements of top quark pair asymmetries at the Tevatron and LHC, highlighting discrepancies with the standard model at Tevatron and consistency at LHC.

Contribution

It provides a comprehensive comparison of asymmetry results from Tevatron and LHC experiments, emphasizing the experimental status and potential implications.

Findings

Tevatron measurements show larger than predicted asymmetries.

LHC measurements are consistent with the standard model.

No significant deviations observed at LHC.

Abstract

The heaviest known elementary particle today, the top quark, has been discovered in 1995 by the CDF and D0 collaborations at the Tevatron proton antiproton collider at Fermilab. Recently, the CDF and D0 collaborations have studied the forward-backward asymmetry in ttbar events, resulting in measured values larger than the standard model prediction. With the start of the LHC at CERN in 2010, a new top quark factory has opened and asymmetry measurements in ttbar have also been performed in a proton proton environment with higher collision energy. No deviations from the standard model have been noticed so far in the measurements of ATLAS and CMS. This article discusses recent results of asymmetry measurements in ttbar events of the ATLAS, CDF, CMS and D0 collaborations.