Pinning down top dipole moments with ultra-boosted tops

TL;DR

This paper assesses current and future collider constraints on top quark dipole moments, emphasizing boosted top events at high energies to improve sensitivity to potential new physics effects.

Contribution

It introduces a novel analysis of boosted top events at high-energy colliders to enhance detection of anomalous top dipole moments beyond existing methods.

Findings

Boosted top events significantly improve sensitivity to top dipole moments.

Future 100 TeV colliders can tighten constraints on top anomalous couplings.

Semileptonic decay selection reduces QCD background effectively.

Abstract

We investigate existing and future hadron-collider constraints on the top dipole chromomagnetic and chromoelectric moments, two quantities that are expected to be modified in the presence of new physics. We focus first on recent measurements of the inclusive top pair production cross section at the Tevatron and at the Large Hadron Collider. We then analyse the role of top-antitop events produced at very large invariant masses, in the context of the forthcoming 13-14 TeV runs of the LHC, and at a future 100 TeV proton-proton collider. In this latter case, the selection of semileptonic decays to hard muons allows to tag top quarks boosted to the multi-TeV regime, strongly reducing the QCD backgrounds and leading to a significant improvement in the sensitivity to anomalous top couplings.