Lepton asymmetry from mixing and oscillations

Kartavtsev, Alexander; Millington, Peter; Vogel, H.

doi:10.1007/jhep06(2016)066

Cited by 31 publications

(68 citation statements)

References 143 publications

(360 reference statements)

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“…A direct comparison was made in the weak washout regime and on a static and stationary background in Ref. [106] (see also the discussion in Chapter [12] of this review). In this idealized setting, the sources of CP violation were studied in a fieldtheoretic approach, based on the Kadanoff-Baym formalism (in both interactionand Heisenberg-picture descriptions), by analysing the effective shell structure of the would-be non-equilibrium heavy-neutrino propagators of a toy scalar model.…”

Section: Rate Equationsmentioning

confidence: 99%

“…[107]), and one finds zero asymmetry, as expected. In the problematic, quasi-degenerate limit, the degree of cancellation was shown [106] to depend strongly on the distribution of particle number between the different flavors and is therefore model-and washout-dependent (i.e. dependent upon the choice of initial conditions in the weak washout regime).…”

Section: Rate Equationsmentioning

confidence: 99%

See 1 more Smart Citation

Flavor effects in leptogenesis

Dev¹,

Bari

Garbrecht

et al. 2018

Int. J. Mod. Phys. A

Self Cite

107

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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].

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Section: Rate Equationsmentioning

confidence: 99%

Section: Rate Equationsmentioning

confidence: 99%

Flavor effects in leptogenesis

Dev¹,

Bari

Garbrecht

et al. 2018

Int. J. Mod. Phys. A

Self Cite

107

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show abstract

“…in order to avoid the singular behavior in the limit ∆M → 0. The proper form of the regulator R IJ has been the subject of a long debate in the literature that has not yet been fully settled (see, e.g., [98,99,[101][102][103][104][105]). In this paper, we do not have anything new to add to this debate.…”

Section: Baryon Asymmetrymentioning

confidence: 99%

Type I seesaw mechanism as the common origin of neutrino mass, baryon asymmetry, and the electroweak scale

et al. 2019

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The type-I seesaw represents one of the most popular extensions of the Standard Model. Previous studies of this model have mostly focused on its ability to explain neutrino oscillations as well as on the generation of the baryon asymmetry via leptogenesis. Recently, it has been pointed out that the type-I seesaw can also account for the origin of the electroweak scale due to heavy-neutrino threshold corrections to the Higgs potential. In this paper, we show for the first time that all of these features of the type-I seesaw are compatible with each other. Integrating out a set of heavy Majorana neutrinos results in small masses for the Standard Model neutrinos; baryogenesis is accomplished by resonant leptogenesis; and the Higgs mass is entirely induced by heavy-neutrino one-loop diagrams, provided that the tree-level Higgs potential satisfies scale-invariant boundary conditions in the ultraviolet. The viable parameter space is characterized by a heavy-neutrino mass scale roughly in the range 10 6.5···7.0 GeV and a mass splitting among the nearly degenerate heavy-neutrino states up to a few TeV. Our findings have interesting implications for high-energy flavor models and low-energy neutrino observables. We conclude that the type-I seesaw sector might be the root cause behind the masses and cosmological abundances of all known particles. This statement might even extend to dark matter in the presence of a keV-scale sterile neutrino.

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“…Now, there is a similar contribution ϵ 0 il to the CP asymmetry from Right Handed neutrino oscillation [36,38,39]. Its form is given by (15) with the replacement f ij by f 0 ij , where…”

Section: Resonant Leptogenesismentioning

confidence: 97%

Common origin of nonzero θ13 and baryon asymmetry of the Universe in a TeV scale seesaw model with A4 flavor symmetry

2018

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We study the possibility of generating nonzero reactor mixing angle θ 13 and baryon asymmetry of the Universe within the framework of an A 4 flavor symmetric model. Using the conventional type I seesaw mechanism we construct the Dirac and Majorana mass matrices that give rise to the correct light neutrino mass matrix. Keeping the right-handed neutrino mass matrix structure trivial so that it gives rise to a (quasi) degenerate spectrum of heavy neutrinos suitable for resonant leptogenesis at TeV scale, we generate the nontrivial structure of Dirac neutrino mass matrix that can lead to the light neutrino mixing through the type I seesaw formula. Interestingly, such a setup naturally leads to nonzero θ 13 due to the existence of antisymmetric contraction of the product of two triplet representations of A 4 . Such an antisymmetric part of the triplet products usually vanishes for right-handed neutrino Majorana mass terms, leading to μ − τ symmetric scenarios in the most economical setups. We constrain the model parameters from the requirement of producing the correct neutrino data as well as baryon asymmetry of the Universe for righthanded neutrino mass scale around TeV. The A 4 symmetry is augmented by additional Z 3 × Z 2 symmetry to make sure that the splitting between right-handed neutrinos required for resonant leptogenesis is generated only by next to leading order terms, making it naturally small. We find that the inverted hierarchical light neutrino masses give more allowed parameter space consistent with neutrino and baryon asymmetry data.

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Lepton asymmetry from mixing and oscillations

Cited by 31 publications

References 143 publications

Flavor effects in leptogenesis

Flavor effects in leptogenesis

Type I seesaw mechanism as the common origin of neutrino mass, baryon asymmetry, and the electroweak scale

Common origin of nonzero θ13 and baryon asymmetry of the Universe in a TeV scale seesaw model with A4 flavor symmetry

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