Lepton flavor violation in the Simplest Little Higgs model

Águila, F. del; Illana, José I.; Jenkins, M.

doi:10.1007/jhep03(2011)080

Cited by 27 publications

(86 citation statements)

References 51 publications

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“…The SLH model contains two scalar triplets Φ 1;2 which transform as ð3; 1Þ and ð1; 3Þ, respectively, under the global ½SUð3Þ × Uð1Þ 2 transformation [8][9][10]35]. At a scale f ≫ v, ½SUð3Þ × Uð1Þ 2 breaks to ½SUð2Þ × Uð1Þ 2 and ten Nambu-Goldstone bosons are generated, eight of which should be eaten by massive gauge bosons during spontaneous gauge symmetry breaking, SUð3Þ × Uð1Þ → SUð2Þ L × Uð1Þ → Uð1Þ em .…”

Section: A a Brief Review Of The Cp-conserving Slh Modelmentioning

confidence: 99%

“…It must be close to v, and their difference arises at the Oððv=fÞ 2 Þ level. To the leading order of (v=f), we have [35] …”

Section: A a Brief Review Of The Cp-conserving Slh Modelmentioning

confidence: 99%

“…The other three neutral degrees of freedom will mix with each other at leading order of (v=f) through the matrix [35] 0…”

Section: A a Brief Review Of The Cp-conserving Slh Modelmentioning

confidence: 99%

“…Choosing the "anomaly-free embedding" [36], in the quark sector T with Q ¼ 2=3 is added as the partner of t, and D and S with Q ¼ −1=3 are added as the parters of d and s, respectively. The Yukawa interactions are then [8][9][10]35]…”

Section: A a Brief Review Of The Cp-conserving Slh Modelmentioning

confidence: 99%

“…A right-handed quark with index a or b must be a mixing state between an additional quark and its SM partner; for example, u a;b R;3 are mixing states between t R and T R . To the leading order of (v=f), the heavy fermions' masses are [9,35] …”

Section: A a Brief Review Of The Cp-conserving Slh Modelmentioning

confidence: 99%

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Spontaneous CP -violation in the simplest little Higgs model and its future collider tests: The scalar sector

Mao

2018

Phys. Rev. D

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We propose spontaneous CP violation in the simplest little Higgs model. In this model, the pseudoscalar field can acquire a nonzero vacuum expectation value. This leads to a mixing between the two scalars with different CP charge, which means that spontaneous CP violation occurs. It is also a connection between the composite Higgs mechanism and CP violation. Facing the experimental constraints, the model is still viable for both scenarios in which the extra scalar appears below or around the electroweak scale. We also discuss the future collider tests of CP violation in the scalar sector through measuring h 2 ZZ and h 1 h 2 Z 0 vertices (see the definitions of the particles in the text), which provide new motivations for future e þ e − and pp colliders. This also shows the importance of the vector-vector-scalar-and vector-scalar-scalar-type vertices in discovering CP-violation effects in the scalar sector.

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Section: A a Brief Review Of The Cp-conserving Slh Modelmentioning

confidence: 99%

“…It must be close to v, and their difference arises at the Oððv=fÞ 2 Þ level. To the leading order of (v=f), we have [35] …”

Section: A a Brief Review Of The Cp-conserving Slh Modelmentioning

confidence: 99%

“…The other three neutral degrees of freedom will mix with each other at leading order of (v=f) through the matrix [35] 0…”

Section: A a Brief Review Of The Cp-conserving Slh Modelmentioning

confidence: 99%

Section: A a Brief Review Of The Cp-conserving Slh Modelmentioning

confidence: 99%

Section: A a Brief Review Of The Cp-conserving Slh Modelmentioning

confidence: 99%

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Spontaneous CP -violation in the simplest little Higgs model and its future collider tests: The scalar sector

Mao

2018

Phys. Rev. D

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Can the 125 GeV Higgs be the Little Higgs?

Reuter¹,

Tonini²

2013

J. High Energ. Phys.

105

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After the discovery of the Higgs-like boson by the LHC 2012 it is the most important task to check whether this new particle is the Standard Model Higgs boson or something else. In this paper, we study whether the 125 GeV boson could be the pseudo-Goldstone boson of Little Higgs models. We derive limits on the parameter space of several Little Higgs models (simple group and product group models, with and without T-parity), both from the experimental data from ATLAS and CMS about the different Higgs discovery channel and the electroweak precision observables. We perform a fit of several Little Higgs models to all electroweak parameters from measurements of SLC, LEP, Tevatron, and LHC. For the Higgs searches, we include all available data from the summer conferences in 2012 as well as the updates from December 2012. We show that there always exists a region in the parameter space of the models under consideration where the measured chi^2 is equal or lower than the SM chi^2: a closer look at the minimum chi^2 will however reveal that the agreement with the collected data is not significantly better as within the SM. While for the models without T-parity the Little Higgs scale f is forced to be of the order 2-4 TeV in order to be compatible with the collected data, in the models with T-parity the scale f is constrained to be only above O(500) GeV, reducing the amount of fine-tuning. We also show that these results are still driven by the electroweak precision measurements due to the bigger LHC dataComment: 40 pages, 6 figure

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Lepton flavor changing Higgs decays in the littlest Higgs model with T-parity

Águila

Ametller

Illana

et al. 2017

J. High Energ. Phys.

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We calculate loop induced lepton flavor violating Higgs decays in the LittlestHiggs model with T-parity. We find that a finite amplitude is obtained only when all contributions from the T-odd lepton sector are included. This is in contrast to lepton flavor violating processes mediated by gauge bosons where the partners of the right-handed mirror leptons can be decoupled from the spectrum. These partners are necessary to cancel the divergence in the Higgs mass introduced by the mirror leptons but are otherwise unnecessary and assumed to be decoupled in previous phenomenological studies. Furthermore, as we emphasize, including the partner leptons in the spectrum also introduces a new source of lepton flavor violation via their couplings to the physical pseudo-Goldstone electroweak triplet scalar. Although this extra source also affects lepton flavor changing gauge transitions, it decouples from these amplitudes in the limit of heavy mass for the partner leptons. We find that the corresponding Higgs branching ratio into taus and muons can be as large as ∼ 0.2 × 10 −6 for T-odd masses of the order a few TeV, a demanding challenge even for the high luminosity LHC.

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Lepton flavor violation in the Simplest Little Higgs model

Cited by 27 publications

References 51 publications

Spontaneous CP -violation in the simplest little Higgs model and its future collider tests: The scalar sector

Spontaneous CP -violation in the simplest little Higgs model and its future collider tests: The scalar sector

Can the 125 GeV Higgs be the Little Higgs?

Lepton flavor changing Higgs decays in the littlest Higgs model with T-parity

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