Triplet leptogenesis in left–right symmetric seesaw models

Hällgren, Tomas; Konstandin, Thomas; Ohlsson, Tommy

doi:10.1088/1475-7516/2008/01/014

Cited by 12 publications

(7 citation statements)

References 27 publications

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“…Since this mechanism necessarily involves lepton number violation, and allows for new CP violating phases, it is interesting to examine it as a possible source of leptogenesis [111,249,254,[267][268][269][270][271][272][273][274][275][276][277][278][279][280][281]. One obvious problem in this scenario is that, unlike singlet fermions, the triplet scalars have gauge interactions that keep them close to thermal equilibrium at temperatures T 10 15 GeV.…”

Section: Triplet Scalar Leptogenesismentioning

confidence: 99%

Leptogenesis

2008

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Leptogenesis is a class of scenarios where the baryon asymmetry of the Universe is produced from a lepton asymmetry generated in the decays of a heavy sterile neutrino. We explain the motivation for leptogenesis. We review the basic mechanism, and describe subclasses of models. We then focus on recent developments in the understanding of leptogenesis: finite temperature effects, spectator processes, and in particular the significance of flavor physics.Comment: 111 pages, 8 figures. Added Sect. 3 on anomalous B+L violation. Corrected equations (6.30) and (6.31). Added Sect. 9.1 with a simple example of the effects of flavours. Revised Sect. 10.1 on susy leptogenesis. Added several references, and other minor improvements. To be published in Physics Report

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Section: Triplet Scalar Leptogenesismentioning

confidence: 99%

Leptogenesis

2008

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“…Leptogenesis has mainly been studied in the framework of the type I seesaw mechanism, in which the source of the lepton asymmetry is the CP-violating decays of heavy Majorana neutrinos. Scalar triplet leptogenesis [126][127][128][129][130][131][132][133][134], based on the type II seesaw mechanism [135][136][137][138], has received much less attention in comparison. In particular, lepton flavor effects were included only recently in this scenario [132][133][134].…”

Section: Type II Seesaw/scalar Triplet Leptogenesismentioning

confidence: 99%

Flavor effects in leptogenesis

Dev¹,

Bari

Garbrecht

et al. 2018

Int. J. Mod. Phys. A

106

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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“…In section 2, we have discussed how small neutrino masses can be generated by adding triplet Higgs ξ a to the SM [22,[26][27][28][130][131][132]. The interactions of these triplet Higgs that are relevant for leptogenesis are given by…”

Section: Leptogenesis With Triplet Higgsmentioning

confidence: 99%

Neutrino Masses and Leptogenesis in Left–Right Symmetric Models: A Review From a Model Building Perspective

et al. 2018

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In this review, we present several variants of left-right symmetric models in the context of neutrino masses and leptogenesis. In particular, we discuss various low scale seesaw mechanisms like linear seesaw, inverse seesaw, extended seesaw and their implications to lepton number violating process like neutrinoless double beta decay. We also visit an alternative framework of left-right models with the inclusion of vector-like fermions to analyze the aspects of universal seesaw. The symmetry breaking of left-right symmetric model around few TeV scale predicts the existence of massive right-handed gauge bosons W R and Z R which might be detected at the LHC in near future. If such signals are detected at the LHC that can have severe implications for leptogenesis, a mechanism to explain the observed baryon asymmetry of the Universe. We review the implications of TeV scale left-right symmetry breaking for leptogenesis.

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Triplet leptogenesis in left–right symmetric seesaw models

Cited by 12 publications

References 27 publications

Leptogenesis

Leptogenesis

Flavor effects in leptogenesis

Neutrino Masses and Leptogenesis in Left–Right Symmetric Models: A Review From a Model Building Perspective

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