The MadAnalysis 5 framework can be used to assess the potential of various LHC analyses for unraveling any specific new physics signal. We present an extension of the LHC reinterpretation capabilities of the programme allowing for the inclusion of theoretical and systematical uncertainties on the signal in the reinterpretation procedure. We have implemented extra methods dedicated to the extrapolation of the impact of a given analysis to higher luminosities, including various options for the treatment of the errors. As an application, we study three classes of new physics models. We first focus on a simplified model in which the Standard Model is supplemented by a gluino and a neutralino. We show that uncertainties could in particular degrade the bounds by several hundreds of GeV when considering 3000/fb of future LHC data. We next investigate another supersymmetry-inspired simplified model, in which the Standard Model is extended by a first generation squark species and a neutralino. We reach similar conclusions. Finally, we study a class of s-channel dark matter setups and compare the expectation for two types of scenarios differing in the details of the implementation of the mediation between the dark and Standard Model sectors.

We revisit the neutral Higgs sector of the Higgs triplet model, with non-negligible mixing in the $CP$-even Higgs sector. We examine the possibility that one of the Higgs boson states is the particle observed at the LHC at 125 GeV, and the other is either the small LEP excess at 98 GeV, or the CMS excess at 136 GeV, or that the neutral Higgs bosons are (almost) degenerate and have both mass 125 GeV. We show that, under general considerations, an (unmixed) neutral Higgs boson cannot have an enhanced decay branching ratio into $$\gamma${}$\gamma${}$ with respect to the Standard Model one. An enhancement is, however, possible for the mixed case but only for the heavier of the two neutral Higgs bosons and not for mass-degenerate Higgs bosons. At the same time the branching ratios into $W{W}^{*}$, $Z{Z}^{*}$, $b\overline{b}$, and ${$\tau${}}^{+}{$\tau${}}^{-}$ are similar to the Standard Model, or reduced. We correlate the branching ratios of both Higgs states into $Z$\gamma${}$ to those into $$\gamma${}$\gamma${}$ for the three scenarios. The mixed neutral sector of the Higgs triplet model exhibits some features that could distinguish it from other scenarios at the LHC.

We show that inclusion of a single generation of vectorlike leptons in the two-Higgs doublet Models significantly enlarges the allowed parameter space consistent with the muon anomalous magnetic moment, as well as with other theoretical and experimental constraints. While previously $(g-2{)}_{\mu }$ could only be resolved in type-X scenario by requiring a light pseudoscalar Higgs boson and large $\tan \beta$, contributions of vectorlike leptons via two-loop Barr Zee diagrams broaden the allowed parameter space, allowing $\tan \beta$ as low as 10 and pseudoscalar masses as large as $\mathcal{O}(1\mathrm{TeV})$, while fulfilling the stringent constraints from precision and flavor observable. Similar results are obtained for type-II scenarios, but there the parameter space is more restricted by flavor observables.

We attribute deviations of the muon and electron magnetic moments from the theoretical predictions to the presence of an additional U(1)′ supersymmetric model. We interpret the discrepancies between the muon and electron anomalous magnetic moments to be due to the presence of non-universal U(1)′ charges. In a minimally extended model, we show that requiring both deviations to be satisfied imposes constraints on the spectrum of the model, in particular on dark matter candidates and slepton masses and ordering. Choosing three benchmarks with distinct dark matter features, we study implications of the model at colliders, concentrating on variables that can distinguish our non-universal scenario from other U(1)′ implementations.

In the context of a left-right symmetric model, we introduce one full generation of vectorlike lepton doublets (both left- and right-handed) together with their mirror doublets. We show that the lightest vectorlike neutrino in the model is right-handed, and can serve as the dark matter candidate. We find that the relic density as well as the direct and indirect DM detection bounds are satisfied for a large range of the parameter space of the model. In accordance with the parameter space, we then explore the possibility of detecting signals of the model at both the LHC and the ILC, in the pair production of the associated vectorlike charged leptons which decay into final states including dark matter. A comprehensive analysis of signal and backgrounds shows that the signals at the ILC, especially with polarized beams, are likely to be visible for light vectorlike leptons, even with low luminosity, rendering our model highly predictable and experimentally testable.