Right-handed sector leptogenesis

Frigerio, Michele; Hambye, Thomas; Ma, Ernest

doi:10.1088/1475-7516/2006/09/009

Cited by 21 publications

(22 citation statements)

References 67 publications

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“…The generation of the dark matter energy density and of the baryon asymmetry have been extensively studied in the context of the SM extended with sterile neutrinos only [6]. The SM extension with sterile neutrinos and δ + was considered in [23]. It was shown that, taking the sterile neutrinos N i as light as a few TeVs and heavier than δ + , one can generate the observed baryon asymmetry via leptogenesis, with no need to enhance resonantly the CP asymmetry.…”

Section: The Modelmentioning

confidence: 99%

“…In this paper we advocate an extension of the SM by three sterile neutrinos, N i , plus a charged scalar, δ + , both of which are naturally present in left-right symmetric or unified extensions of the SM [23]. The charged scalar interacts with SM leptons, both doublets and singlets, and with sterile neutrinos, and its mass can be as low as allowed by current collider bounds -about 200 GeV.…”

Section: Introductionmentioning

confidence: 99%

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Sterile neutrino dark matter and low scale leptogenesis from a charged scalar

Frigerio

Yaguna

2015

Eur. Phys. J. C

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We show that novel paths to dark matter generation and baryogenesis are open when the standard model is extended with three sterile neutrinos and a charged scalar . Specifically, we propose a new production mechanism for the dark matter particle—a multi-keV sterile neutrino, —that does not depend on the active-sterile mixing angle and does not rely on a large primordial lepton asymmetry. Instead, is produced, via freeze-in, by the decays of while it is in equilibrium in the early Universe. In addition, we demonstrate that, thanks to the couplings between the heavier sterile neutrinos and , baryogenesis via leptogenesis can be realized close to the electroweak scale. The lepton asymmetry is generated either by -decays for masses TeV, or by -oscillations for GeV. Experimental signatures of this scenario include an X-ray line from dark matter decays, and the direct production of at the LHC. This model thus describes a minimal, testable scenario for neutrino masses, the baryon asymmetry, and dark matter.

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Section: The Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Sterile neutrino dark matter and low scale leptogenesis from a charged scalar

Frigerio

Yaguna

2015

Eur. Phys. J. C

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“…For various leptogenesis studies in the frameworks of left-right models, see [122][123][124][125][126][127]149]. Similarly for S O (10), see [128][129][130]150].…”

Section: Implications For Left-right Symmetric and S O(10) Modelsmentioning

confidence: 99%

Leptogenesis: beyond the minimal type I seesaw scenario

Hambye

2012

New J. Phys.

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Recent evidence for neutrino masses has established the leptogenesis mechanism as a very natural possible explanation for the baryon asymmetry of the Universe. The explicit realization of this mechanism depends on the neutrino mass model considered. If the right-handed type-I seesaw model of neutrino masses is certainly the most straightforward, it is not the only natural one, especially in the framework of explicit GUT realizations of the seesaw. In this paper, we review in detail the various seesaw scenarios that can implement the leptogenesis mechanism successfully, beyond the paradigm of the pure standard type-I seesaw model. This includes scenarios based on the existence of scalar triplets (type-II), of fermion triplets (type-III) as well as mixed seesaw frameworks.

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“…As an example [34], a successful leptogenesis may be due to decays of RH neutrinos into a RH charged lepton and an SU(2) L singlet charged scalar (contained, e.g., in the 120 H multiplet of SO (10)). The coupling f R between the RH leptons and ∆ R (see eq.…”

Section: Jhep01(2007)043mentioning

confidence: 99%

Interplay of type I and type II seesaw contributions to neutrino mass

Akhmedov

Frigerio

2007

J. High Energy Phys.

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Type I and type II seesaw contributions to the mass matrix of light neutrinos are inherently related if left-right symmetry is realized at high energy scales. We investigate implications of such a relation for the interpretation of neutrino data. We proved recently that the left-right symmetric seesaw equation has eight solutions, related by a duality property, for the mass matrix of right-handed neutrinos M R . In this paper the eight allowed structures of M R are reconstructed analytically and analyzed numerically in a bottom-up approach. We study the dependence of right-handed neutrino masses on the mass spectrum of light neutrinos, mixing angle θ 13 , leptonic CP violation, scale of left-right symmetry breaking and on the hierarchy in neutrino Yukawa couplings. The structure of the seesaw formula in several specific SO(10) models is explored in the light of the duality. The outcome of leptogenesis may depend crucially on the choice among the allowed structures of M R and on the level crossing between right-handed neutrino masses.

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Right-handed sector leptogenesis

Cited by 21 publications

References 67 publications

Sterile neutrino dark matter and low scale leptogenesis from a charged scalar

Sterile neutrino dark matter and low scale leptogenesis from a charged scalar

Leptogenesis: beyond the minimal type I seesaw scenario

Interplay of type I and type II seesaw contributions to neutrino mass

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