Leptogenesis: beyond the minimal type I seesaw scenario

Hambye, Thomas

doi:10.1088/1367-2630/14/12/125014

Cited by 73 publications

(86 citation statements)

References 145 publications

(273 reference statements)

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“…Leptogenesis could then proceed within a 2 RH neutrino mixing scenario [385]. Many leptogenesis models relying on extensions of the minimal type I scenarios have been also proposed (for a recent review see [407]). In some cases these models also offer new possibilities to explain simultaneously DM the and matter-antimatter asymmetry.…”

Section: Leptogenesis (Author: P DI Bari)mentioning

confidence: 99%

A White Paper on keV sterile neutrino Dark Matter

Adhikari

Agostini

et al. 2017

J. Cosmol. Astropart. Phys.

372

316

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Abstract. We present a comprehensive review of keV-scale sterile neutrino Dark Matter, collecting views and insights from all disciplines involved -cosmology, astrophysics, nuclear, and particle physics -in each case viewed from both theoretical and experimental/observational perspectives. After reviewing the role of active neutrinos in particle physics, astrophysics, and cosmology, we focus on sterile neutrinos in the context of the Dark Matter puzzle. Here, we first review the physics motivation for sterile neutrino Dark Matter, based on challenges and tensions in purely cold Dark Matter scenarios. We then round out the discussion by critically summarizing all known constraints on sterile neutrino Dark Matter arising from astrophysical observations, laboratory experiments, and theoretical considerations. In this context, we provide a balanced discourse on the possibly positive signal from X-ray observations. Another focus of the paper concerns the construction of particle physics models, aiming to explain how sterile neutrinos of keV-scale masses could arise in concrete settings beyond the Standard Model of elementary particle physics. The paper ends with an extensive review of current and future astrophysical and laboratory searches, highlighting new ideas and their experimental challenges, as well as future perspectives for the discovery of sterile neutrinos.

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Section: Leptogenesis (Author: P DI Bari)mentioning

confidence: 99%

A White Paper on keV sterile neutrino Dark Matter

Adhikari

Agostini

et al. 2017

J. Cosmol. Astropart. Phys.

372

316

View full text Add to dashboard Cite

show abstract

“…3 Although the leading contribution to this process may come from other (higher-order) operators in more elaborated models [24][25][26][27][28][29][30][31][32][33]. 4 If the observed baryon asymmetry of the universe originates from leptogenesis, LNV must be at work at some energy, too [35] (see for recent reviews [36][37][38]). 5 In the text generic scalar multiplets are denoted by H and their doubly-charged component by H ±± .…”

Section: Introductionmentioning

confidence: 99%

LHC bounds on lepton number violation mediated by doubly and singly-charged scalars

Águila

Chala

2014

J. High Energ. Phys.

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Abstract:The only possible doubly-charged scalar decays into two Standard Model particles are into pairs of same-sign charged leptons, H ±± → l ± l ± , l = e, µ, τ , or gauge bosons, H ±± → W ± W ± ; being necessary the observation of both to assert the violation of lepton number. However, present ATLAS and CMS limits on doubly-charged scalar production are obtained under specific assumptions on its branching fractions into dileptons only. Although they can be extended to include decays into dibosons and lepton number violating processes. Moreover, the production rates also depend on the type of electroweak multiplet H ±± belongs to. We classify the possible alternatives and provide the Feynman rules and codes for generating the corresponding signals for pair and associated doubly-charged scalar production, including the leading contribution from the s-channel exchange of electroweak gauge bosons as well as the vector-boson fusion corrections. Then, using the same analysis criteria as the LHC collaborations we estimate the limits on the H ±± mass as a function of the electroweak multiplet it belongs to, and obtain the bounds on the lepton number violating processes pp → H ±± H ∓∓ → ± ± W ∓ W ∓ and pp → H ±± H ∓ → ± ± W ∓ Z, = e, µ, implied by the ATLAS and CMS doubly-charged scalar searches.

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“…As we have mentioned earlier, the source of CP violation is only present in the triplet contribution and that is through the vev of the S field. However as it is known [70,79], a single SU (2) L triplet does not produce CP-asymmetry. Therefore there are two remaining possibilities to generate successful lepton asymmetry [74,78] …”

Section: Leptogenesismentioning

confidence: 98%

SpontaneousCPviolation in lepton-sector: A common origin forθ13, the DiracCPphase, and leptogenesis

Karmakar

Sil

2016

Phys. Rev. D

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A possible interplay between the two terms of the general type-II seesaw formula is exercised which leads to the generation of nonzero θ 13 . The specific flavor structure of the model, guided by the A 4 × Z 4 × Z 3 symmetry and accompanied with the Standard Model singlet flavons, yields the conventional seesaw contribution to produce the tribimaximal lepton mixing which is further corrected by the presence of the SU (2) L triplet contribution to accommodate θ 13 . We consider the CP symmetry to be spontaneously broken by the complex vacuum expectation value (vev) of a singlet field S. While the magnitude of its complex vev is responsible for generating θ 13 , its phase part induces the low energy CP violating phase (δ) and the CP violation required for leptogenesis. Hence the triplet contribution, although sub-dominant, plays crucial role in providing a common source for non-zero θ 13 , δ and CP-violation required for leptogenesis. We find that the recent hint for δ close to 3π/2 is somewhat favored in this set-up though it excludes the exact equality with 3π/2. We also discuss the generation of lepton asymmetry in this scenario.

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Leptogenesis: beyond the minimal type I seesaw scenario

Cited by 73 publications

References 145 publications

A White Paper on keV sterile neutrino Dark Matter

A White Paper on keV sterile neutrino Dark Matter

LHC bounds on lepton number violation mediated by doubly and singly-charged scalars

SpontaneousCPviolation in lepton-sector: A common origin forθ13, the DiracCPphase, and leptogenesis

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