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arXiv · 2508.14960

Multi-top signals of vectorlike quarks at the LHC

Elias Bernreuther·Bogdan A. Dobrescu
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Abstract

We point out that events with 6 or more top quarks may be observed at the LHC if certain particles exist at the TeV scale. In a model where a vectorlike quark of charge 2/3 decays into a top quark and a pseudoscalar particle, which subsequently decays into a top-antitop pair, the LHC production cross section for events with 6 top quarks may be above 10 fb. If the pseudoscalar is part of a complex scalar field, then longer cascade decays, involving the scalar partner, may lead to events with 8 or even 10 top quarks. We show that for a region of parameter space the dominant LHC signal in this model is 8 top quarks (i.e., four $t\bar t $ pairs). The ensuing signals would be spectacular, including many leptons and $b$ jets. A discovery in that case would allow several cross section measurements that may determine the masses of all three new particles.

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Elias Bernreuther, Bogdan A. Dobrescu. 2025-08-20. Multi-top signals of vectorlike quarks at the LHC. https://doi.org/10.1007/jhep12(2025)047

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