For a heavy scalar coupled to top quarks, only an NLO-matched effective field theory reproduces the full model across the LHC energy range, while a leading-order fit overestimates the high-mass tail and LHC constraints.
Constraining scalar resonances with top-quark pair production at the LHC
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abstract
Constraints on models which predict resonant top-quark pair production at the LHC are provided via a reinterpretation of the Standard Model (SM) particle level measurement of the top-anti-top invariant mass distribution, $m(t\bar{t})$. We make use of state-of-the-art Monte Carlo event simulation to perform a direct comparison with measurements of $m(t\bar{t})$ in the semi-leptonic channels, considering both the boosted and the resolved regime of the hadronic top decays. A simplified model to describe various scalar resonances decaying into top-quarks is considered, including CP-even and CP-odd, color-singlet and color-octet states, and the excluded regions in the respective parameter spaces are provided.
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Effective field theory and scalar extensions of the top quark sector
For a heavy scalar coupled to top quarks, only an NLO-matched effective field theory reproduces the full model across the LHC energy range, while a leading-order fit overestimates the high-mass tail and LHC constraints.