Complete vectorlike fourth family with 
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: A global analysis

In this paper, we summarize phenomenology in lepton portal dark matter (DM) models, where DM couples to leptons and extra leptons/sleptons. There are several possible setups: a DM field is either a complex/real scalar or a Dirac/Majorana fermion, and chiralities of leptons that couple to the DM are different according to the spin of the DM. We discuss the prediction of each model and compare it with the latest experimental constraints from the DM detections, the LHC, and the flavor experiments. We also propose simple setups to resolve the discrepancy in the anomalous magnetic moment of muon.

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“…Similar conclusion is obtained in models which ∆ae,µ is explained by the loop corrections involving vectorlike leptons and a Z boson[52][53][54].…”

supporting

confidence: 83%

Current status and muon g − 2 explanation of lepton portal dark matter

Kawamura

Okawa

Omura

2020

J. High Energ. Phys.

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“…In this paper, we study extra lepton models as a candidate to solve the scale hierarchy in the NP contributions to the muon g − 2 and the CKM measurements. The extra leptons can contribute to the latter at the tree level [25,26], while effects on the former arise first at the one-loop level [26][27][28][29][30][31][32][33][34][35][36][37]. This explains naturally the hierarchy in the NP contributions.…”

Section: Jhep08(2020)004mentioning

confidence: 94%

Muon g − 2 and CKM unitarity in extra lepton models

Endo

Mishima

2020

J. High Energ. Phys.

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We investigate the impact of extra leptons on observed tensions in the muon g − 2 and the first-row CKM unitarity. By introducing a new SU(2) L doublet lepton and a SU(2) L triplet lepton, we find that both of the tensions can be explained simultaneously under constraints from electroweak precision observables and Higgs-boson decays. Our model could be tested by measurements of h → µµ at future collider experiments.

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“…The background channels up to two extra jets are generated with the MLM matching scheme [37]. While substantial theoretical work has already been done over the last decades [24,25,28,[38][39][40][41][42][43][44][45][46][47][48][49][50][51], only recently, the searches for exotic charged leptons have started. The most recent analysis was done by the CMS collaboration at the LHC in 2019 [52], where a search for VLLs coupling to taus was performed.…”

Section: Searching For Vector-like Leptons At the Lhcmentioning

confidence: 99%

Phenomenology of vector-like leptons with Deep Learning at the Large Hadron Collider

Freitas

Gonçalves

Morais

et al. 2021

J. High Energ. Phys.

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In this paper, a model inspired by Grand Unification principles featuring three generations of vector-like fermions, new Higgs doublets and a rich neutrino sector at the low scale is presented. Using the state-of-the-art Deep Learning techniques we perform the first phenomenological analysis of this model focusing on the study of new charged vector-like leptons (VLLs) and their possible signatures at CERN’s Large Hadron Collider (LHC). In our numerical analysis we consider signal events for vector-boson fusion and VLL pair production topologies, both involving a final state containing a pair of charged leptons of different flavor and two sterile neutrinos that provide a missing energy. We also consider the case of VLL single production where, in addition to a pair of sterile neutrinos, the final state contains only one charged lepton. We propose a novel method to identify missing transverse energy vectors by comparing the detector response with Monte-Carlo simulated data. All calculated observables are provided as data sets for Deep Learning analysis, where a neural network is constructed, based on results obtained via an evolutive algorithm, whose objective is to maximise either the accuracy metric or the Asimov significance for different masses of the VLL. Taking into account the effect of the three analysed topologies, we have found that the combined significance for the observation of new VLLs at the high-luminosity LHC can range from 5.7σ, for a mass of 1.25 TeV, all the way up to 28σ if the VLL mass is 200 GeV. We have also shown that by the end of the LHC Run-III a 200 GeV VLL can be excluded with a confidence of 8.8 standard deviations. The results obtained show that our model can be probed well before the end of the LHC operations and, in particular, providing important phenomenological information to constrain the energy scale at which new gauge symmetries emergent from the considered Grand Unification picture can be manifest.

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Complete vectorlike fourth family with U(1)′ : A global analysis

Cited by 34 publications

References 198 publications

Current status and muon g − 2 explanation of lepton portal dark matter

Current status and muon g − 2 explanation of lepton portal dark matter

Muon g − 2 and CKM unitarity in extra lepton models

Phenomenology of vector-like leptons with Deep Learning at the Large Hadron Collider

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