Treatment of top-quark backgrounds in extreme phase spaces: the "top $p_T$ reweighting" and novel data-driven estimations in ATLAS and CMS

Abstract

The top quark plays an important role in searches for physics beyond the SM, both as a dominant background and as a key signature for the signal. The most notable feature found in the top physics analyses in both ATLAS and CMS Collaborations: the disagreement between simulation and data of the top quark $p_T$ spectrum - is highlighted. A reweighting procedure which significantly improves the agreement between simulation and data, also known as the "top $p_T$ reweighting", is summarised. Commonly raised points concerning the reweighting to fixed-order predictions are discussed, and several refined approaches are mentioned. An overview of several data-driven methods developed and used to estimate the $t\bar{t}$ background in regions with large jet and b-jet multiplicities and/or high top quark $p_T$ is presented.

Proceeding for 13th International Workshop on Top Quark Physics

References in corpus (2)

• Measurement of the Higgs boson production rate in association with top quarks in final states with electrons, muons, and hadronically decaying tau leptons at $\sqrt{s}=$ 13 TeV
• Top quarks and exotics at ATLAS and CMS

Cited by in corpus (2)

• Measurements of differential cross-sections in top-quark pair events with a high transverse momentum top quark and limits on beyond the Standard Model contributions to top-quark pair production with the ATLAS detector at $\sqrt{s}=13$ TeV
• Refinable modeling for unbinned SMEFT analyses