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Exploring scalar and vector bileptons at the LHC in a 331 model. (English) Zbl 1398.81296
Summary: We present an analysis on the production of two same-sign lepton pairs at the LHC, mediated by bileptons in the \(\mathrm{SU}(3)_c \times \mathrm{SU}(3)_L \times \mathrm U(1)_X\) theory, the so-called 331 model. Compared to other 331 scenarios, in this model the embedding of the hypercharge is obtained with the addition of 3 exotic quarks and doubly-charged vector gauge bosons with lepton numbers \(\pm 2\) in the spectrum \((Y^{\pm \pm})\), which can mediate the production of four-lepton final states. Furthermore, a complete description of the model requires the introduction of a Higgs scalar sector, which is a sextet of \(\mathrm{SU}(3)_L\), necessary in order to correctly account for the lepton masses. As a result of this, new doubly-charged scalar states \(H^{\pm \pm}\) are part of the spectrum as well and can in principle compete with the vector bileptons in giving rise to four-lepton final states. We investigate both channels and study several observables at the LHC, for both signal and Standard Model \(ZZ\) background. With respect to previous work on vector- and scalar-bilepton production, we use the most updated exclusion limits at the LHC and implement the 331 model in a full Monte Carlo simulation code, capable of being interfaced with any analysis framework. Our result is that the 331 signal can be discriminated from the background with a significance of 6–9 standard deviations, depending on the LHC luminosity, with the vector bileptons dominating over the scalar ones.
81V22 Unified quantum theories
81T10 Model quantum field theories
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