Vectorlike leptons at the Large Hadron Collider

Kumar, Nilanjana; Martin, Stephen P.

doi:10.1103/physrevd.92.115018

Cited by 119 publications

(128 citation statements)

References 69 publications

(55 reference statements)

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“…For small values of | sin θ|, radiative corrections to λ 111 dominate the corrections to the SM h 1 h 1 production cross-section, as opposed to the leading order mixing angle effects reflected in figures 6-7 (which are important for larger | sin θ|). 7 There are more sophisticated methods to calculate exclusion and discovery in the presence of systematic uncertainties [96][97][98]. However, for for simplicity we adopt the prescription that the systematic uncertainties are subdominant for S/B 0.1. .…”

Section: Additional Probesmentioning

confidence: 99%

Non-resonant collider signatures of a singlet-driven electroweak phase transition

Chen

Kozaczuk

Lewis

2017

J. High Energ. Phys.

107

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Abstract:We analyze the collider signatures of the real singlet extension of the Standard Model in regions consistent with a strong first-order electroweak phase transition and a singlet-like scalar heavier than the Standard Model-like Higgs. A definitive correlation exists between the strength of the phase transition and the trilinear coupling of the Higgs to two singlet-like scalars, and hence between the phase transition and non-resonant scalar pair production involving the singlet at colliders. We study the prospects for observing these processes at the LHC and a future 100 TeV pp collider, focusing particularly on double singlet production. We also discuss correlations between the strength of the electroweak phase transition and other observables at hadron and future lepton colliders. Searches for non-resonant singlet-like scalar pair production at 100 TeV would provide a sensitive probe of the electroweak phase transition in this model, complementing resonant di-Higgs searches and precision measurements. Our study illustrates a strategy for systematically exploring the phenomenologically viable parameter space of this model, which we hope will be useful for future work.

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Section: Additional Probesmentioning

confidence: 99%

Non-resonant collider signatures of a singlet-driven electroweak phase transition

Chen

Kozaczuk

Lewis

2017

J. High Energ. Phys.

107

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“…al. showed that if the VL lepton decays only to τ , then the bound may only be M e4 275 GeV [15]. Due to the sampling method that we explain below, VL leptons in this model can either be predominantly E L,R or L L,R , depending on model parameters.…”

Section: Methodsmentioning

confidence: 99%

“…There are more recent bounds on the mass of VL leptons obtained from reinterpreting ATLAS and CMS experiments [12][13][14][15]. If the lightest VL lepton is predominantly E L,R , then the bound is similar to the LEP bound.…”

Section: Methodsmentioning

confidence: 99%

Vectorlike leptons: Muon g−2 anomaly, lepton flavor violation, Higgs boson decays, and lepton nonuniversality

Poh

Raby

2017

Phys. Rev. D

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In this paper, we consider the Standard Model (SM) with one family of vectorlike (VL) leptons, which couple to all three families of the SM leptons. We study the constraints on this model coming from the heavy charged lepton mass bound, electroweak precision data, the muon anomalous magnetic moment, lepton flavor violation, Higgs decay constraints, and a recently measured lepton nonuniversality observable, R K * 0 , along with R K . We find that the strongest constraints are coming from the muon g − 2, R µµ = Γ(h → µµ)/Γ(h → µµ) SM , R γγ and BR(µ → eγ). Although VL leptons couple to all three families of the SM leptons, the ratio of electron-VL to muon-VL coupling is constrained to be λ e /λ µ 10 −4 . We also find that this model cannot fit the lepton nonuniversality discrepancies.

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“…These were studied in a phenomenological context in [53]. However the two benchmarks models considered in their study correspond roughly to the SUð2Þ L singlet (and doublet models) of Eq.…”

Section: Simplified Fermionic Modelsmentioning

confidence: 99%

Anomalous neutral gauge boson interactions and simplified models

et al. 2018

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Trilinear Z boson interactions are sensitive probes both of new sources of CP violation in physics beyond the standard model and of new particle thresholds. Measurements of trilinear Z interactions are typically interpreted in the frameworks of anomalous couplings and effective field theory, both of which require care in interpretation. To obtain a quantitative picture of the power of these measurements when interpreted in a TeV-scale context, we investigate the anatomy of ZZZ interactions and consider two minimal and perturbative simplified models which induce such interactions through new scalar and fermion loops at the weak scale, focusing on ZZ and vector boson fusion-induced Zjj production at the LHC and ZZ production at a future e þ e − collider. We show that both threshold and non-threshold effects often are small compared to the sensitivity of the LHC, while the increased sensitivity of a future lepton collider should allow us to constrain such scenarios through associated electroweak precision effects complementary to direct searches at hadron colliders.

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Vectorlike leptons at the Large Hadron Collider

Cited by 119 publications

References 69 publications

Non-resonant collider signatures of a singlet-driven electroweak phase transition

Non-resonant collider signatures of a singlet-driven electroweak phase transition

Vectorlike leptons: Muon g−2 anomaly, lepton flavor violation, Higgs boson decays, and lepton nonuniversality

Anomalous neutral gauge boson interactions and simplified models

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