Flavour always matters in scalar triplet leptogenesis

Lavignac, Stéphane; Schmauch, Benoît

doi:10.1007/jhep05(2015)124

Cited by 23 publications

(30 citation statements)

References 87 publications

(235 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…which is the equation of the single-flavor approximation in the same limit. Flavor effects also tend to become relatively less important in the opposite limit λ 1 (corresponding to B B φ ), because the lepton flavor asymmetries are more efficiently washed out than for smaller values of λ , and the asymmetry generated in the Higgs sector becomes the dominant source of the final baryon-to-photon ratio [128,134]. Figure 8 shows the dependence of the generated baryon asymmetry on λ and M ∆ for Ansatz 1 (left panel) and Ansatz 2 (right panel).…”

Section: Quantitative Impact Of Flavor Effectsmentioning

confidence: 99%

Flavor effects in leptogenesis

Dev¹,

Bari

Garbrecht

et al. 2018

Int. J. Mod. Phys. A

107

View full text Add to dashboard Cite

Flavor effects can have a significant impact on the final estimate of the lepton (and therefore baryon) asymmetry in scenarios of leptogenesis. It is therefore necessary to account fully for this flavor dynamics in the relevant transport equations that describe the production (and washout) of the asymmetry. Doing so can both open up and restrict viable regions of parameter space relative to the predictions of more approximate calculations. In this review, we identify the regimes in which flavor effects can be relevant and illustrate their impact in a number of phenomenological models. These include type I and type II seesaw embeddings, and low-scale resonant scenarios. In addition, we provide an overview of the semi-classical and field-theoretic methods that have been developed to capture flavor effects in a consistent way.b Here, we have taken the right-handed charged leptons to live in their flavor basis, which we can always do without the need to rotate other couplings. This is, of course, different for the doublet leptons, which have SM Yukawa coupling, as well as couplings to RH neutrinos, that cannot be simultaneously diagonalized. A flavor-covariant description of the right-handed charged leptons is presented in Ref. [41].

show abstract

Section: Quantitative Impact Of Flavor Effectsmentioning

confidence: 99%

Flavor effects in leptogenesis

Dev¹,

Bari

Garbrecht

et al. 2018

Int. J. Mod. Phys. A

107

View full text Add to dashboard Cite

show abstract

“…I seesaw neutrino mass, by fixing the Higgs mixing angle β = π 4 and calculate the CP asymmetry by using Eq. (41). We show the variation of this coupling with the CP asymmetry in Fig 6, from which one can infer that for low values of the Yukawa couplings the CP asymmetry turns out to be very small.…”

Section: Cp Asymmetry From the Interference Of Tree And Scalar Self Ementioning

confidence: 79%

Scalar triplet leptogenesis in the presence of right-handed neutrinos with S ₃ symmetry

Mishra¹,

Giri²

2020

J. Phys. G: Nucl. Part. Phys.

View full text Add to dashboard Cite

Leptogenesis appears to be a viable alternative to account for the baryon asymmetry of the Universe through baryogenesis. In this context, we consider a scenario in which the standard model is extended with S 3 and Z 2 symmetry in addition to the two scalar triplets, two scalar doublets and three right handed neutrinos. Presence of scalar triplets and right-handed neutrinos in the scenarios of both type-I and type-II seesaw framework provide a different leptogenesis option and can help us to understand the matter-antimatter asymmetry with simple S 3 symmetry. We discuss the neutrino phenomenology and leptogenesis in both high (O(10 10 ) GeV) and low energy scale (O(2)TeV) by constraining the Yukawa couplings. Moreover, we also consider the constraints on model parameters from neutrino oscillation data and leptogenesis to explain the rare lepton flavor violating decay and muon g-2 anomaly. In the above expression,L L = L c L iτ 2 = (−e c L ν c L ), y ν i and y li are the Yukawa couplings of neutral and charged leptons, respectively. M iR are the Majorana masses of right handed neutrinos. Models with extra Higgs in the presence of discrete symmetries are well studied in the literature [45]-[52]. With the additional scalar content in the model, we can write the interaction potential as

show abstract

“…Even if we consider triplet decay contribution to leptogenesis, successful leptongenesis demands the triplet mass to be heavier than around 10 11 GeV. 71 It will be interesting and worth pursuing to constrain the Majorana phases simultaneously from two or more different observables and we leave such a study to future investigations.…”

Section: Results and Conclusionmentioning

confidence: 98%

Discriminating Majorana neutrino phases in the light of lepton flavor violation and leptogenesis in type I+II seesaw models

Kalita

Borah

2015

Int. J. Mod. Phys. A

View full text Add to dashboard Cite

We study the effects of Majorana neutrino phases in lepton flavor violation and the origin of matter-antimatter asymmetry through the mechanism of leptogenesis within the framework of a model where both type I and type II seesaw mechanisms can contribute to tiny neutrino masses. We parametrize the type I seesaw mass matrix by assuming it to give rise to a tri-bimaximal (TBM) type neutrino mixing which predicts θ 13 = 0. The type II seesaw mass matrix is then constructed in such a way that the necessary deviation from TBM mixing and the best fit values of neutrino parameters can be obtained when both type I and type II seesaw contributions are taken into account. Considering both subleading as well as equally dominating type II seesaw term, we first constrain the Majorana CP phases from the requirement of producing correct baryon asymmetry through leptogenesis and then incorporating the experimental bounds on lepton flavor violating decays μ → e + γ and μ → e + e + e.

show abstract

Flavour always matters in scalar triplet leptogenesis

Cited by 23 publications

References 87 publications

Flavor effects in leptogenesis

Flavor effects in leptogenesis

Scalar triplet leptogenesis in the presence of right-handed neutrinos with S ₃ symmetry

Discriminating Majorana neutrino phases in the light of lepton flavor violation and leptogenesis in type I+II seesaw models

Contact Info

Product

Resources

About

Flavour always matters in scalar triplet leptogenesis

Cited by 23 publications

References 87 publications

Flavor effects in leptogenesis

Flavor effects in leptogenesis

Scalar triplet leptogenesis in the presence of right-handed neutrinos with S 3 symmetry

Discriminating Majorana neutrino phases in the light of lepton flavor violation and leptogenesis in type I+II seesaw models

Contact Info

Product

Resources

About

Scalar triplet leptogenesis in the presence of right-handed neutrinos with S ₃ symmetry