New physics with boosted single top production at the LHC and future colliders

TL;DR

This paper evaluates the potential of boosted single-top measurements at the HL-LHC, HE-LHC, and FCC for detecting new physics such as anomalous couplings and $W'$ bosons, showing significant sensitivity improvements at future colliders.

Contribution

It provides a comparative analysis of the sensitivity of current and future colliders to new physics in boosted single-top final states.

Findings

FCC doubles sensitivity to anomalous couplings compared to HL-LHC.

FCC can detect $W'$ couplings 2-5 times smaller than HL-LHC.

FCC can probe $W'$ masses up to 30 TeV with SM-like couplings.

Abstract

We address the potential of measurements with boosted single-top final states at the high-luminosity LHC (HL-LHC) and possible future hadron colliders: the high-energy LHC (HE-LHC), and the future circular collider (FCC). As new physics examples to assess the potential, we consider the search for $tbW$ anomalous couplings and for a weakly-coupled $W'$ boson. The FCC would improve by a factor of two the sensitivity to anomalous couplings of the HL-LHC. For $W'$ bosons, the FCC is sensitive to $W'$ couplings $2-5$ times smaller than the HL-LHC in the mass range 2-4 TeV, and to masses up to 30 TeV in the case of Standard Model-like couplings.