Dark matter and vectorlike leptons from gauged lepton number

Schwaller, Pedro; Tait, Tim M. P.; Vega-Morales, Roberto

doi:10.1103/physrevd.88.035001

Cited by 51 publications

(47 citation statements)

References 59 publications

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“…• Pure singlet extension of the SM [55][56][57][58][59] • Hidden (dark) sector DM with hidden (dark) gauge symmetry [52][53][54][60][61][62][63][64][65][66][67] • Dilaton or radion [68][69][70][71][72][73][74][75][76][77][78][79][80] • Enhancing diphoton rate from vector-like(VL) fermions or new charged vector bosons [81][82][83][84][85][86][87][88][89] Determination of the Higgs couplings in the presence of a (light) singlet scalar boson has not been discussed properly in the recent literature (but, for some earlier attempts, see Refs. [16,27,40]).…”

Section: Introductionmentioning

confidence: 99%

Implications of LHC data on 125 GeV Higgs-like boson for the Standard Model and its various extensions

Choi

Jung

2013

J. High Energ. Phys.

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Recent data on 125 GeV Higgs-like boson at the LHC starts to constrain the electroweak symmetry breaking (EWSB) sector of the SM and its various extensions. If one imposes the local gauge symmetry of the Standard Model (SM) (SU (3) c ×SU (2) L ×U (1) Y ) to the SM and any possible new physics scenarios, the SM Higgs properties will be modified by intrinsically two different ways: by new physics either coupling directly to the SM Higgs boson h, or affecting indirectly the SM Higgs properties through the mixing of h with a SM singlet scalar s. (Here s is a singlet under the SM gauge group, but may be charged under a new gauge charge and can have nonrenormalizable couplings to non-SM particles.) The models of two Higgs doublet, extra sequential and mirror fermions belong to the first category, whereas the models with a hidden sector dark matter, extra vectorlike fermions and new charged vector bosons, which can enhance the diphoton rate of the SM Higgs-like resonance, belong to the second category. We perform a global fit to data in terms of the effective Lagrangian description of two interaction eigenstates of scalar bosons, a SM Higgs and a singlet scalar, and their mixing. This framework is more suitable to study singlet-extended scenarios discussed above compared to other approaches based on the Lagrangian of mass eigenstates. With fairly model-independent assumptions, the effective Lagrangian contains at most four free parameters still encompassing the majority of models in the literature. Interestingly, the SM gives the best fit if all data from ATLAS and CMS are used, whereas various singlet extensions can fit better to individual ATLAS or CMS data. Without further assumptions, an upper bound on the total width (or, nonstandard branching ratio) is generically obtained. Furthermore, global fit based on our parameterization can be used to probe interactions of the singlet scalar if the singlet resides below 2m W .

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Section: Introductionmentioning

confidence: 99%

Implications of LHC data on 125 GeV Higgs-like boson for the Standard Model and its various extensions

Choi

Jung

2013

J. High Energ. Phys.

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“…We will use the exact same notation here in order to avoid unnecessary confusion and present in this section the Lagrangian and resulting mass matrices. Note that such a model may arise by gauging lepton number, as explained in references [16,31,32].…”

Section: Lagrangian and Mass Matricesmentioning

confidence: 99%

“…For further discussions of dark matter with vector-like fermions we refer the reader to references [18,24,28,32,37].…”

Section: Dark Mattermentioning

confidence: 99%

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Baryogenesis and dark matter with vector-like fermions

Fairbairn

Grothaus

2013

J. High Energ. Phys.

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We show that vector-like fermions can act as the dark matter candidate in the universe whilst also playing a crucial role in electroweak baryogenesis through contributing to the barrier in the one-loop thermal scalar potential. In order for the new fermions to give rise to a strong first order phase transition, we show that one requires rather large Yukawa couplings in the new sector, which are strongly constrained by electroweak precision tests and perturbativity. Strong couplings between the dark matter candidate and the Higgs boson intuitively lead to small values of the relic density and problems with dark matter direct detection bounds. Nevertheless, when considering the most general realisation of the model, we find regions in the parameter space that respect all current constraints and may explain both mysteries simultaneously.

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“…While there may be many ways to construct the U (1) L model [18][19][20][21][22][23], we take the one given in Ref. [18] as an anomaly-free example.…”

Section: U (1)l Modelmentioning

confidence: 99%

Constraints on the U(1)L gauge boson in a wide mass range

Jeong

Kim

Lee³

2016

Int. J. Mod. Phys. A

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There is a growing interest for the search of new light gauge bosons. The small mass of a new boson can turn various kinds of low-energy experiments to a new discovery machine, depending on their couplings to the standard model particles. It is important to understand the properties of each type of gauge boson and their current constraints for a given mass. While the dark photon (which couples to the electric charges) and the U (1)B−L gauge boson have been well studied in an extensive mass range, the U (1)L gauge boson has not been fully investigated yet. We consider the gauge boson of the U (1)L in a wide mass range m Z ≈ 0 − 10 12 eV and investigate the constraints on its coupling from various experiments, discussing the similarities and differences from the dark photon and the U (1)B−L gauge boson.

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Dark matter and vectorlike leptons from gauged lepton number

Cited by 51 publications

References 59 publications

Implications of LHC data on 125 GeV Higgs-like boson for the Standard Model and its various extensions

Implications of LHC data on 125 GeV Higgs-like boson for the Standard Model and its various extensions

Baryogenesis and dark matter with vector-like fermions

Constraints on the U(1)L gauge boson in a wide mass range

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