<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>μ</mml:mi><mml:mo>→</mml:mo><mml:mi>e</mml:mi><mml:mi>γ</mml:mi></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>τ</mml:mi><mml:mo>→</mml:mo><mml:mi>l</mml:mi><mml:mi>γ</mml:mi></mml:math>decays in the fermion triplet seesaw model

Abada, Asmâa; Biggio, Carla; Bonnet, Florian; Gavela, M.B.; Hambye, Thomas

doi:10.1103/physrevd.78.033007

Cited by 104 publications

(99 citation statements)

References 41 publications

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“…The µ → e conversion rate R µ→e has been calculated in the literature for the various possible types of seesaw, with right-handed neutrinos [10][11][12][13][14][15][16], scalar triplet(s) [17][18][19] and fermion triplets [20]. For the right-handed neutrino case ("type-I" seesaw), a comparison of the various calculations shows that there is no agreement on what is actually the result.…”

Section: Introductionmentioning

confidence: 99%

Muon conversion to electron in nuclei in type-I seesaw models

Alonso

Dhen

Gavela

et al. 2013

J. High Energ. Phys.

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We compute the µ → e conversion in the type-I seesaw model, as a function of the right-handed neutrino mixings and masses. The results are compared with previous computations in the literature. We determine the definite predictions resulting for the ratios between the µ → e conversion rate for a given nucleus and the rate of two other processes which also involve a µ − e flavour transition: µ → eγ and µ → eee. For a quasi-degenerate mass spectrum of right-handed neutrino masses -which is the most natural scenario leading to observable rates-those ratios depend only on the seesaw mass scale, offering a quite interesting testing ground. In the case of sterile neutrinos heavier than the electroweak scale, these ratios vanish typically for a mass scale of order a few TeV. Furthermore, the analysis performed here is also valid down to very light masses. It turns out that planned µ → e conversion experiments would be sensitive to masses as low as 2 MeV. Taking into account other experimental constraints, we show that future µ → e conversion experiments will be fully relevant to detect or constrain sterile neutrino scenarios in the 2 GeV−1000 TeV mass range.

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Section: Introductionmentioning

confidence: 99%

Muon conversion to electron in nuclei in type-I seesaw models

Alonso

Dhen

Gavela

et al. 2013

J. High Energ. Phys.

Self Cite

171

175

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“…In such models, the Yukawa couplings need to be small to suppress the neutrino mass. Lepton flavour violating decays in the context of Type-III seesaw models have also been considered in [14]. Recently it has also been suggested that the neutral member of the triplet can serve as the dark matter and can be instrumental in generating small neutrino mass radiatively [15].…”

Section: Introductionmentioning

confidence: 99%

Renormalization group evolution of neutrino masses and mixing in the Type-III seesaw mechanism

et al. 2009

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We consider the standard model extended by heavy right handed fermions transforming as triplets under SU(2) L , which generate neutrino masses through the Type-III seesaw mechanism.At energies below their respective mass scales, the heavy fields get sequentially decoupled to give an effective dimension-5 operator. Above their mass thresholds, these fields also participate in the renormalization of the wavefunctions, masses and coupling constants. We compute the renormalization group evolution of the effective neutrino mass matrix in this model, with particular emphasis on the threshold effects. The evolution equations are obtained in a basis of neutrino parameters where all the quantities are well-defined everywhere, including at θ 13 = 0. We also point out the important role of the threshold effects and Majorana phases in the evolution of mixing angles through illustrative examples.

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“…(13,14) holds. However, this model, besides the fact of being better motivated from a GUT perspective, has got some features which distinguish it from a generic 2RHN model:…”

Section: The Modelmentioning

confidence: 99%

“…(13,14), one can check that 4 < ∼ R < ∼ 80 in the normal hierarchy case for a real parameter z, if U e3 ≃ 0 and the Majorana phase Φ vanishes as well. As the value of U e3 increases, one can verify that R diminishes and it becomes O(1) for U e3 ≃ 0.2.…”

Section: Flavour Violating Processesmentioning

confidence: 99%

“…In this model lepton flavour violation (LFV) is usually suppressed either by the small Yukawas or by a large mass. This is the standard situation in non-SUSY seesaw models, unless a low-scale inverse seesaw is realized [4,14]. Furthermore, in presence of cancellations in the neutrino mass matrix, sizable rates of LFV processes are still possible (see for example, in the context of type I+III seesaw, [15]).…”

Section: Introductionmentioning

confidence: 99%

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Phenomenology of SUSY SU(5) with type I+III seesaw

Biggio

2010

J. High Energ. Phys.

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We consider a supersymmetric SU(5) model where two neutrino masses are obtained via a mixed type I+III seesaw mechanism induced by the component fields of a single SU(5) adjoint. We have analyzed the phenomenology of the model paying particular attention to flavour violating processes and dark matter relic density, assuming universal boundary conditions. We have found that, for a seesaw scale larger than 10 12÷13 GeV, BR(µ → eγ) is in the reach of the MEG experiment in sizable regions of the parameter space. On the other side, current bounds on it force BR(τ → µγ) to be well below the reach of forthcoming experiments, rendering thus the model disprovable if a positive signal is found. The same bounds still allow for a sizable positive contribution to ǫK , while the CP violation in the Bs mixing turns out to be too small to account for the di-muon anomaly reported by the D0 collaboration. Finally, the regions where the neutralino relic density is within the WMAP bounds can be strongly modified with respect to the constrained MSSM case. In particular, a peculiar coannihilation region, bounded from above, can be realized, which allows us to put an upper bound on the dark matter mass for certain set-ups of the parameters.

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μ→eγandτ→lγdecays in the fermion triplet seesaw model

Cited by 104 publications

References 41 publications

Muon conversion to electron in nuclei in type-I seesaw models

Muon conversion to electron in nuclei in type-I seesaw models

Renormalization group evolution of neutrino masses and mixing in the Type-III seesaw mechanism

Phenomenology of SUSY SU(5) with type I+III seesaw

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