Lepton flavor violation in hadronic decays of the tau lepton in the simplest little Higgs model

Lami, Andrea; Portolés, Jorge; Roig, Pablo

doi:10.1103/physrevd.93.076008

Cited by 18 publications

(30 citation statements)

References 56 publications

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“…We reviewed in some detail the SLH model in our previous work [17]. Here we will only recall its main features for the reader's convenience, but refer to [17] and references therein for an expanded account.…”

Section: The Simplest Little Higgs Modelmentioning

confidence: 99%

“…One such mechanism assumes that the Higgs boson is a pseudo-Nambu-Goldstone boson of a spontaneously broken (larger than in the SM) electroweak symmetry group, in the so-called Little Higgs models [15]. Simplest Little Higgs (SLH) model [16] is a concrete realization of this idea that we employed in our study of LFV semileptonic tau decays recently [17]. Our main conclusion was that the observation of LFV semileptonic tau decays at Belle-II [18] would (using reasonable approximations) rule out this model, as it predicts decay rates four to five orders of magnitude smaller than current bounds.…”

Section: Introductionmentioning

confidence: 99%

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H→ℓℓ′in the simplest little Higgs model

Lami

Roig

2016

Phys. Rev. D

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Little Higgs Models are promising constructs to solve the hierarchy problem affecting the Higgs boson mass for generic new physics. However, their preservation of lepton universality forbids them to account for the H → τ µ CMS hint and at the same time respect (as they do) the severe limits on H → µe inherited from the non-observation of µ → eγ. We compute the predictions of the Simplest Little Higgs Model for the H → ℓℓ ′ decays and conclude that the measurement of any of these decays at LHC (even with a much smaller rate than currently hinted) would, under reasonable assumptions, disfavor this model. This result is consistent with our earlier observation of very suppressed lepton flavor violating semileptonic tau decays within this model.

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Section: The Simplest Little Higgs Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

H→ℓℓ′in the simplest little Higgs model

Lami

Roig

2016

Phys. Rev. D

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“…Following the authors of Ref. [27] in their study of LFV hadronic τ decays, we will consider values of sin 2θ of the order of 10 −1 . Under this assumption, the term proportional to sin 2 θ becomes subdominant, which is equivalent to consider an approximately diagonal mixing matrix.…”

Section: Bounds On the Parameter Space Of The Slhmmentioning

confidence: 99%

Anomalous magnetic and weak magnetic dipole moments of the $$\tau $$ τ lepton in the simplest little Higgs model

2017

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We obtain analytical expressions, both in terms of parametric integrals and Passarino-Veltman scalar functions, for the one-loop contributions to the anomalous weak magnetic dipole moment (AWMDM) of a charged lepton in the framework of the simplest little Higgs model (SLHM). Our results are general and can be useful to compute the weak properties of a charged lepton in other extensions of the standard model (SM). As a by-product we obtain generic contributions to the anomalous magnetic dipole moment (AMDM), which agree with previous results. We then study numerically the potential contributions from this model to the τ lepton AMDM and AWMDM for values of the parameter space consistent with current experimental data. It is found that they depend mainly on the energy scale f at which the global symmetry is broken and the t β parameter, whereas there is little sensitivity to a mild change in the values of other parameters of the model. While the τ AMDM is of the order of 10 −9 , the real (imaginary) part of its AWMDM is of the order of 10 −9 (10 −10 ). These values seem to be out of the reach of the expected experimental sensitivity of future experiments.

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“…We presented our results for τ → (P/PP/V) ( = e, µ; P is short for pseudoscalar meson and V for vector resonance) in Ref. [7] 1 . There we decided to include the effect of only two heavy neutrinos in our analysis.…”

Section: Lfv Tau Decaysmentioning

confidence: 99%

Lepton flavor violation in the Simplest Little Higgs model

Roig

2017

Nuclear and Particle Physics Proceedings

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Little Higgs Models are a possible elegant solution to the hierarchy problem on the Higgs mass. As they predict naturally small deviations with respect to SM results, they are in agreement with all current experimental data. In this contribution, we review lepton flavor violation in the Simplest Little Higgs model focusing on semileptonic lepton flavor violating tau decays (where some new results are presented) and H → . Within this model, the most promising decay channels for discovering lepton flavor violation are µ → e conversion in nuclei, µ → eγ ( * ) , τ → (e/µ)γ and τ → (e/µ)(π + π − /ρ).

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Lepton flavor violation in hadronic decays of the tau lepton in the simplest little Higgs model

Cited by 18 publications

References 56 publications

H→ℓℓ′in the simplest little Higgs model

H→ℓℓ′in the simplest little Higgs model

Anomalous magnetic and weak magnetic dipole moments of the $$\tau $$ τ lepton in the simplest little Higgs model

Lepton flavor violation in the Simplest Little Higgs model

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