Leptogenesis from low energy CP violation

Moffat, K.; Pascoli, Silvia; Petcov, S.T.; Turner, Jessica

doi:10.1007/jhep03(2019)034

Cited by 52 publications

(77 citation statements)

References 111 publications

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“…(57) and (58) Finally, we conclude this section by pointing out that our scenario also manages to account for the generation of the baryon asymmetry even if the CP -violating phases δ and σ in the PMNS matrix are the only source of CP violation during leptogenesis. This observation allows us to conclude that our scenario is compatible with the concept of leptogenesis from low-energy CP violation [80,[117][118][119][120][121][122][123][124][125][126]. To show that this is the case all we have to do is to fix the CIP parameter z I at z I = 0 in our numerical analysis.…”

Section: Overall We Find Very Good Agreement Between the Results In supporting

confidence: 59%

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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Section: Overall We Find Very Good Agreement Between the Results In supporting

confidence: 59%

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

et al. 2019

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“…In this section we consider the possibility that the low energy CP phases (δ, α 21 and α 31 ) provide all of the CP violation necessary for leptogenesis to produce the observed BAU. In past work it has been shown that these phases are sufficient sources of CP violation in a mass range 10 6 < M (GeV) < 10 13 [25,[67][68][69][70][71][72][73][74] (for a review see, e.g., [75]), where there must be some fine-tuning for heavy Majorana neutrino masses M 10 9 GeV, if they are mildly hierarchical. Here we ask: Is it possible for purely the low energy phases to provide CP violation for successful leptogenesis within the Neutrino Option?…”

Section: Leptogenesis From Purely Low Energy Cp Violation In the Neutmentioning

confidence: 99%

Leptogenesis in the Neutrino Option

Brivio¹,

Moffat

Pascoli

et al. 2019

J. High Energ. Phys.

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We examine the compatibility between the Neutrino Option, in which the electroweak scale is generated by PeV mass type I seesaw Majorana neutrinos, and leptogenesis. We find the Neutrino Option is consistent with resonant leptogenesis. Working within the minimal seesaw scenario with two heavy Majorana neutrinos N 1,2 , which form a pseudo-Dirac pair, we explore the viable parameter space. We find that the Neutrino Option and successful leptogenesis are compatible in the cases of a neutrino mass spectrum with normal (inverted) ordering for 1.2×10 6 < M (GeV) < 8.8×10 6 (2.4×10 6 < M (GeV) < 7.4×10 6 ), with M = (M 1 + M 2 )/2 and M 1,2 the masses of N 1,2 . Successful leptogenesis requires that ∆M/M ≡ (M 2 − M 1 )/M ∼ 10 −8 . We further show that leptogenesis can produce the baryon asymmetry of the Universe within the Neutrino Option scenario when the requisite CP violation in leptogenesis is provided exclusively by the Dirac or Majorana low energy CP violation phases of the PMNS matrix.

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“…See, for example, Refs. [18,19,20]. It is then discussed whether two right-handed neutrinos whose masses are TeV-scale can produce a sufficient amount of the BAU or not.…”

Section: Tev-scale Right-handed Neutrinosmentioning

confidence: 99%

Resonant leptogenesis at TeV-scale and neutrinoless double beta decay

Asaka

Yoshida

2019

J. High Energ. Phys.

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We investigate a resonant leptogenesis scenario by quasi-degenerate right-handed neutrinos which have TeV-scale masses. Especially, we consider the case when two right-handed neutrinos are responsible to leptogenesis and the seesaw mechanism for active neutrino masses, and assume that the CP violation occurs only in the mixing matrix of active neutrinos. In this case the sign of the baryon asymmetry depends on the Dirac and Majorana CP phases as well as the mixing angle of the right-handed neutrinos. It is shown how the yield of the baryon asymmetry correlates with these parameters. In addition, we find that the effective neutrino mass in the neutrinoless double beta decay receives an additional constraint in order to account for the observed baryon asymmetry depending on the masses and mixing angle of right-handed neutrinos.

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Leptogenesis from low energy CP violation

Cited by 52 publications

References 111 publications

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

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

Leptogenesis in the Neutrino Option

Resonant leptogenesis at TeV-scale and neutrinoless double beta decay

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