Logo
ScienceStack
Table of Contents
Fetching ...
Sign In

Differential measurements of $\bar{t}tZ$ and $\bar{t}t\bar{t}t$ at large $Q^2$ at FCC-hh

Louise Beriet, Matteo Defranchis, Birgit Stapf, Michele Selvaggi

Abstract

This contribution presents studies of differential top-quark measurements at the Future Circular Collider in its proton-proton stage (FCC-hh). The analyses target the leptonic final states of the $\bar{t}tZ$ and $\bar{t}t\bar{t}t$ production processes. Particular focus is given to the high-$Q^2$ regime, where sensitivity to new physics, as encoded in an Effective Field Theory framework, is enhanced. The dataset corresponds to an integrated luminosity of 30 $\text{ab}^{-1}$ at $\sqrt{s} = 84$ TeV. The reconstructed transverse momentum $\text{p}_\text{T}(Z_{\ell\ell})$ distribution is shown to be measurable up to approximately 2 TeV with a precision of 20% in the high energy region ($\text{p}_\text{T}(Z_{\ell\ell})$ >1.8 TeV). The scalar transverse momentum $\text{H}_\text{T}$ of the four-top production reaches 3.5 TeV with a precision of 35%. Additionally, a dedicated study of the lepton reconstruction efficiency shows that redefining the isolation variable to account for the highly boosted objects at FCC-hh improves the total signal yield in $\bar{t}tZ$ by a factor of 1.5.

Differential measurements of $\bar{t}tZ$ and $\bar{t}t\bar{t}t$ at large $Q^2$ at FCC-hh

Abstract

This contribution presents studies of differential top-quark measurements at the Future Circular Collider in its proton-proton stage (FCC-hh). The analyses target the leptonic final states of the and production processes. Particular focus is given to the high- regime, where sensitivity to new physics, as encoded in an Effective Field Theory framework, is enhanced. The dataset corresponds to an integrated luminosity of 30 at TeV. The reconstructed transverse momentum distribution is shown to be measurable up to approximately 2 TeV with a precision of 20% in the high energy region ( >1.8 TeV). The scalar transverse momentum of the four-top production reaches 3.5 TeV with a precision of 35%. Additionally, a dedicated study of the lepton reconstruction efficiency shows that redefining the isolation variable to account for the highly boosted objects at FCC-hh improves the total signal yield in by a factor of 1.5.
Paper Structure (6 sections, 1 equation, 2 figures, 1 table)

This paper contains 6 sections, 1 equation, 2 figures, 1 table.

Table of Contents

  1. Introduction
  2. Differential Analyses
  3. $\mathrm{t\overline{t}t\overline{t}}\xspace$
  4. $\mathrm{t\overline{t}Z}\xspace$
  5. Lepton Isolation
  6. Conclusion

Figures (2)

  • Figure 1: Left: Distribution of the reconstructed $H_T(\mathrm{t\overline{t}t\overline{t}}\xspace)$ after event selection. Bottom panel displays the relative contributions from statistical and systematic uncertainties. Right: Uncertainty on the electron and muon identification efficiencies and b-jet tagging efficiency as a function of $p_T$.
  • Figure 2: $\text{p}_\text{T}(Z_{\ell\ell})$ distribution of the $\mathrm{t\overline{t}Z}\xspace$ process after event selection, before (left) and after (right) isolation optimization. Bottom panels display the relative contributions of statistical and systematic uncertainties.