Top-philic heavy resonances in four-top final states and their EFT interpretation

Abstract

With an expected rate of about one event per 100,000 top-quark pairs, four top-quark final states very rarely arise at the LHC. Though scarce, they offer a unique window onto top-quark compositeness, self-interactions and more generically, onto any top-philic new physics. By employing simplified models featuring heavy resonances, we study the range of validity of effective theory interpretations of current four top-quark analyses at the LHC and establish their future reach at the HL-LHC. We find that for the class of models under consideration, the effective field theory interpretations are not applicable. We therefore present the most up-to-date limits obtained from public CMS analyses using simplified models. Finally, we put forward a novel recasting strategy for the experimental results based on the production of top quarks with large transverse momentum.

$$ t\overline{t}t\overline{t} $$ signatures through the lens of color-octet scalars

“…On the other hand, as we discussed in section 3.2, our reimplementation of ATLAS-CONF-2020-002 is less sensitive than the official multi-bin analysis, so the true limits from that search may rule out some more high-branching fraction parameter space. It is also worth noting that this limit is fairly close to that imposed by a previous CMS measurement [62,108,109] of σ(pp → t tt t) with a lower cross section and lower significance than the most recent ATLAS results. Finally, we observe that there is a point around m O or m o ≈ 800 GeV where ATLAS-CONF-2020-002 becomes more sensitive to our signals than the four-top analysis.…”

Probing Top-philic New Physics via Four-Top-Quark Production

“…Note added: While finalizing the manuscript a nice work dealing with the same topic appears online [34].…”

Phenomenology of unusual top partners in composite Higgs models

“…set-ups (sgluons) [65][66][67][68][69][70][71][72]. In the following we will assume that π 8 can either decay into t t and/or g g. 3 Current bounds on the π 8 mass from LHC searches for pair production with dominant decays into t t and gg lie at ∼ 1.05 TeV and ∼ 0.85 TeV, respectively, while bounds from single production are strongly model dependent [40].…”