Impact of θ<sub>13</sub>on lepton flavour violating processes within SUSY seesaw

Antusch, Stefan; Arganda, E.; Herrero, M. J.; Teixeira, Ana

doi:10.1088/1126-6708/2006/11/090

Cited by 125 publications

(155 citation statements)

References 99 publications

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“…In any case, it is manifest that for this stricter T RH bound, the preferred source of CP violation for leptogenesis is θ 2 . In both cases, the observed differences between the present and the previous analyses ( [19]) originate from taking into account flavour effects in the Boltzmann equations. In the θ 2 case, the differences are less apparent, essentially due to the fact that m 1,e = 0 and m 1,µ ≈ m 1,τ .…”

Section: Numerical Examplescontrasting

confidence: 63%

“…In particular, this leads to deformations of the allowed regions when compared to those presented in Ref. [19].…”

Section: Numerical Examplesmentioning

confidence: 67%

“…5(b)) update the analysis of Ref. [19], which had been performed in the flavourindependent approximation. In the present flavour-dependent computation, we find that the BAU arising from complex θ 3 is somewhat larger and new regions, which are indeed compatible with the WMAP range, have now emerged.…”

Section: Numerical Examplesmentioning

confidence: 99%

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Towards constraints on the SUSY seesaw from flavour-dependent leptogenesis

Antusch

Teixeira

2007

J. Cosmol. Astropart. Phys.

100

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We systematically investigate constraints on the parameters of the supersymmetric type-I seesaw mechanism from the requirement of successful thermal leptogenesis in the presence of upper bounds on the reheat temperature T RH of the early Universe. To this end, we solve the flavour-dependent Boltzmann equations in the MSSM, extended to include reheating. With conservative bounds on T RH , leading to mildly constrained scenarios for thermal leptogenesis, compatibility with observation can be obtained for extensive new regions of the parameter space, due to flavour-dependent effects. On the other hand, the hypothesis that the right-handed neutrino sector conserves CP, and that leptogenesis exclusively arises from the CPviolating phases of the U MNS matrix, is only marginally consistent. Taking into account stricter bounds on T RH further suggests that (additional) sources of CP violation must arise from the right-handed neutrino sector, further implying stronger constraints for the right-handed neutrino parameters.

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Section: Numerical Examplescontrasting

confidence: 63%

“…In particular, this leads to deformations of the allowed regions when compared to those presented in Ref. [19].…”

Section: Numerical Examplesmentioning

confidence: 67%

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Towards constraints on the SUSY seesaw from flavour-dependent leptogenesis

Antusch

Teixeira

2007

J. Cosmol. Astropart. Phys.

100

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“…We consider two particular values of θ 13 , θ 13 = 0 • , 5 • and choose SPS 1a. Motivated from the thermal leptogenesis favoured θ 2 -regions [2], we take 0 |θ 2 | π/4, with arg θ 2 = {π/8 , π/4 , 3π/8}. We display the numerical results, considering m ν1 = 10 −5 eV and m ν1 = 10 −3 eV, while for the heavy neutrino masses we take m N = (10 10 , 10 11 , 10 14 ) GeV.…”

Section: Sfrag Replacementsmentioning

confidence: 99%

“…Other SPS points have also been considered but they are not shown here for brevity (see [2]). We clearly observe in Fig.…”

Section: Sfrag Replacementsmentioning

confidence: 99%

LFV in tau and muon decays within SUSY seesaw

Antusch

Arganda

Herrero

et al. 2007

Nuclear Physics B - Proceedings Supplements

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In these proceedings we present the results for lepton flavour violating tau and muon decays within the SUSY seesaw scenario. Specifically, we consider the Constrained Minimal Supersymmetric Standard Model extended by three right handed neutrinos, νR i and their corresponding SUSY partners,νR i , (i = 1, 2, 3), and use the seesaw mechanism for neutrino mass generation. We include the predictions for the branching ratios of two types of lepton flavour violating channels, lj → liγ and lj → 3li, and compare them with the present bounds and future experimental sensitivities. We first analyse the dependence of the branching ratios with the most relevant SUSY seesaw parameters, and we then focus on the particular sensitivity to θ13, which we find specially interesting on the light of its potential future measurement. We further study the constraints from the requirement of successfully producing the baryon asymmetry of the Universe via thermal leptogenesis, which is another appealing feature of the SUSY seesaw scenario. We conclude with the impact that a potential measurement of θ13 can have on lepton flavour violating physics. This is a very short summary of the works in Refs.[1] and [2] to which we refer the reader for more details. LFV within SUSY seesawThe seesaw mechanism is implemented by the inclusion of a Majorana mass m R for the right handed neutrinos (allowed due to their singlet character under all the symmetries of the Standard Model (SM)) and by considering a large separation between this mass and the electroweak (EW) scale [3]. After EW symmetry breaking, the full 6 × 6 neutrino mass matrix is given in terms of the 3 × 3 Dirac mass matrix, that we work in a lepton basis where both the right handed mass matrix and the charged lepton mass matrix are diagonal in flavour space. The flavour mixing in the light neutrino sector is given by the Maki-Nakagawa-Sakata matrix U MNS [4] for which we use the standard parameterization, which is written in terms of three mixing angles θ 12 , θ 13 and θ 23 and three CP violating phases δ, ϕ 1 and ϕ 2 .We use here the parameterisation proposed in Ref. [5], where the solution to the seesaw equation, with R being a 3 × 3 orthogonal complex matrix, defined by three complex angles θ i (i = 1, 2, 3). The attractiveness of this parameterisation is that it allows to easily implement the requirement of compatibility with low energy neutrino data. It also clearly shows that in the singlet seesaw scenario one can have large neutrino Yukawa couplings, Y ν ∼ O(1), by simply choosing large entries in m diag N . The main implication of these large Yukawa coupling is that they can induce large lepton flavour violating (LFV) rates [6]. The total number of parameters of the neutrino sector in this scenario is 18, which in this particular pa-1

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Neutrino masses and mixing: a flavour symmetry roadmap

Morisi

Valle

2012

Fortschritte der Physik

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Over the last ten years tri-bimaximal mixing has played an important role in modeling the flavour problem. We give a short review of the status of flavour symmetry models of neutrino mixing. We concentrate on non-Abelian discrete symmetries, which provide a simple way to account for the TBM pattern. We discuss phenomenological implications such as neutrinoless double beta decay, lepton flavour violation as well as theoretical aspects such as the possibility to explain quarks and leptons within a common framework, such as grand unified models.Comment: 26 pages, 19 figures, 3 tables. Review written for the special issue on 'Flavor Symmetries', edited by S.Morisi, H.P.Nilles, & J.W.F.Valle, to appear in Fortschritte der Physik - Progress of Physic

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Impact of θ₁₃on lepton flavour violating processes within SUSY seesaw

Cited by 125 publications

References 99 publications

Towards constraints on the SUSY seesaw from flavour-dependent leptogenesis

Towards constraints on the SUSY seesaw from flavour-dependent leptogenesis

LFV in tau and muon decays within SUSY seesaw

Neutrino masses and mixing: a flavour symmetry roadmap

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Impact of θ13on lepton flavour violating processes within SUSY seesaw

Cited by 125 publications

References 99 publications

Towards constraints on the SUSY seesaw from flavour-dependent leptogenesis

Towards constraints on the SUSY seesaw from flavour-dependent leptogenesis

LFV in tau and muon decays within SUSY seesaw

Neutrino masses and mixing: a flavour symmetry roadmap

Contact Info

Product

Resources

About

Impact of θ₁₃on lepton flavour violating processes within SUSY seesaw