Flavor from the electroweak scale

Bauer, Martin; Carena, Marcela; Gemmler, Katrin

doi:10.1007/jhep11(2015)016

Cited by 51 publications

(44 citation statements)

References 64 publications

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“…In the context of the BNT model, one can add another Higgs doublet to the field, similar to the two Higgs doublet model [22,23], leading to the following effective Lagrangian in the nth dimension:…”

Section: ð2:12þmentioning

confidence: 99%

Neutrino mass from Higgs quadruplet and multicharged Higgs searches at the LHC

2018

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In this paper, we revisit the dimension-7 neutrino mass generation mechanism based on the addition of an isospin 3=2 scalar quadruplet and two vectorlike isotriplet leptons to the standard model. We discuss the LHC phenomenology of the charged scalars of this model, complemented by the electroweak precision and lepton flavor violation constraints. We pay particular attention to the triply charged and doubly charged components. We focus on the same-sign-trilepton signatures originating from the triply charged scalars and find a discovery reach of 600-950 GeV at 3 ab −1 of integrated luminosity at the LHC. On the other hand, doubly charged Higgs has been an object of collider searches for a long time, and we show how the present bounds on its mass depend on the particle spectrum of the theory. Strong constraints on the model parameter space can arise from the measured decay rate of the standard model Higgs to a pair of photons as well.

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Section: ð2:12þmentioning

confidence: 99%

Neutrino mass from Higgs quadruplet and multicharged Higgs searches at the LHC

2018

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“…The masses of these new particles are bound to be of the order of M ψ ∝ Λ < few TeV, due to the breaking of the flavor symmetry at the electroweak scale. Searches for new vector-like quarks are therefore an additional, promising way to constrain this class of theories, as we discuss in [4].…”

Section: Electroweak Scale Flavor Modelsmentioning

confidence: 99%

“…Therefore, to avoid this limit, the new scalars cannot be arbitrarily heavy, and should be accessible at the LHC. The mass of the pseudoscalar Higgs A is zero in the absence of explicit breaking of the flavor symmetry (up to effects due to the QCD anomaly), in which the potential does not allow for a bµ H 1 H 2 term and A becomes the goldstone boson of the spontaneously broken U (1) flavor group [4]. A source of explicit flavor breaking needs to be assumed in order to explain a mass of m A = 200 − 700 GeV.…”

Section: Higgs Couplingsmentioning

confidence: 99%

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Creating the fermion mass hierarchies with multiple Higgs bosons

2016

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After the Higgs boson discovery, it is established that the Higgs mechanism explains electroweak symmetry breaking and generates the masses of all particles in the Standard Model, with the possible exception of neutrino masses. The hierarchies among fermion masses and mixing angles remain however unexplained. We propose a new class of two Higgs doublet models in which a flavor symmetry broken at the electroweak scale addresses this problem. The models are strongly constrained by electroweak precision tests and the fact that they produce modifications to Higgs couplings and flavor changing neutral currents; they are also constrained by collider searches for extra scalar bosons. The surviving models are very predictive, implying unavoidable new physics signals at the CERN Large Hadron Collider, e.g. extra Higgs Bosons with masses M < 700 GeV.

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“…If the NP sector is sufficiently complex, it can contain multiple scales and effects in τ → µγ can be decoupled from h → τ µ. Of course many other choices of flavor symmetries are possible and it would be for example interesting to combine our framework with models that use flavor symmetries at the electroweak scale to explain the hierarchical structure of the SM quarks and leptons [89][90][91]. It would also be interesting to examine the possibility that the scalar φ (and/or a) is responsible for the 750 GeV excess in γγ searches observed by ATLAS and CMS [92,93].…”

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confidence: 99%

Lμ−Lτ theory of Higgs flavor violation and (g−2)μ

2016

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Several experiments reported hints for the violation of lepton flavor or lepton flavor universality in processes involving muons. Most prominently, there is the hint for a non-zero rate of the flavor violating Higgs decay h → τ µ at the LHC, as well as the hint for lepton flavor universality violation in rare B meson decays at LHCb. In addition, also the long standing discrepancy in the anomalous magnetic moment of the muon motivates new physics connected to muons. A symmetry which violates lepton flavor universality, is Lµ − Lτ : the difference of muon-number and tau-number. We show that adding vector-like fermions to a Lµ − Lτ theory generates naturally an effect in the anomalous magnetic moment of the muon and h → τ µ, while effects in other τ → µ transitions are systematically suppressed by symmetry arguments. We find that if Lµ − Lτ is gauged it is possible to also accommodate the discrepant b → sµµ data while predicting a τ → 3µ and a modified h → µµ rate within reach of upcoming experiments.

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Flavor from the electroweak scale

Cited by 51 publications

References 64 publications

Neutrino mass from Higgs quadruplet and multicharged Higgs searches at the LHC

Neutrino mass from Higgs quadruplet and multicharged Higgs searches at the LHC

Creating the fermion mass hierarchies with multiple Higgs bosons

Lμ−Lτ theory of Higgs flavor violation and (g−2)μ

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