Roberta Calabrese, Alberto Orso Maria Iorio, Stefano Morisi, Giulia Ricciardi, Natascia Vignaroli
Keyword:
High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), High Energy Physics - Experiment (hep-ex)
journal:
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date:
2023-12-04 00:00:00
Abstract
Despite being remarkable predictive, the Standard Model leaves unanswered several important issues, which motivate an ongoing search for its extensions. One fashionable possibility are the so-called 331 models, where the electroweak gauge group is extended to $SU_L(3)\times U(1)$. We discuss these models and provide a classification. As a second step, we focus on a minimal extension which includes vector-like quarks (VLQs) and new gauge bosons. We investigate the phenomenology and perform a consistent analysis of the production at the LHC of a pair of doubly charged bileptons, including processes where VLQs contribute, and in particular the associate production VLQ-bilepton. Finally, we extract the bound on the bilepton mass, $m_Y>$ 1300 GeV, from a reinterpretation of a recent ATLAS search for doubly-charged Higgs bosons in multi-lepton final states.