Heavy quark decays in the bilepton model

Given the current absence of new physics signals at the LHC, it is increasingly important to investigate alternative scenarios beyond those commonly explored. In this work, we study a variant of the 331 model that predicts the existence of vector bileptons with electric charge and lepton number ± 2, as well as TeV-scale exotic quarks carrying charges ± 5/3 and ± 4/3. Specifically, we focus on the primary production of heavy quarks with charge ± 5/3, which decay into a bottom quark and a bilepton, followed by the bilepton’s decay into same-sign muon pairs. As a case study, we select a benchmark point that complies with current experimental exclusion limits and theoretical expectations for the bilepton mass. Our analysis shows that the resulting signal stands out clearly from Standard Model backgrounds and could be observed at a future 100 TeV hadron collider such as FCC- hh . In contrast, the LHC, even in its high-luminosity phase, lacks the sensitivity required to detect this signal.