Resonant enhancement in leptogenesis

Dev, P. S. Bhupal; Garny, Mathias; Klarić, Juraj; Millington, Peter; Teresi, Daniele

doi:10.1142/s0217751x18420034

Cited by 105 publications

(117 citation statements)

References 165 publications

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“…[18] and take into account the modified CI parametrization for the Yukawa couplings in the scotogenic model in Eq. (11). This procedure results in…”

Section: A Analytical Insightsmentioning

confidence: 99%

Low-scale leptogenesis in the scotogenic neutrino mass model

2018

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The scotogenic model proposed by Ernest Ma represents an attractive and minimal example for the generation of small Standard Model neutrino masses via radiative corrections in the dark matter sector. In this paper, we demonstrate that, in addition to neutrino masses and dark matter, the scotogenic model also allows to explain the baryon asymmetry of the Universe via low-scale leptogenesis. First, we consider the case of two right-handed neutrinos (RHNs) N 1;2 , for which we provide an analytical argument why it is impossible to push the RHN mass scale below M min 1 ∼ 10 10 GeV, which is identical to the value in standard thermal leptogenesis in the type-I seesaw scenario with the same washout strength. Then, we present a detailed study of the three-RHN case based on both an analytical and a numerical analysis. In the case of three RHNs, we obtain a lower bound on the N 1 mass of around 10 TeV. Remarkably enough, successful low-scale leptogenesis can be achieved without any degeneracy in the RHN mass spectrum. The only necessary condition is a suppression in the N 1 Yukawa couplings, which results in suppressed washout and a small active neutrino mass of around 10 −12 eV. This leads to the fascinating realization that low-scale leptogenesis in the scotogenic model can be tested in experiments that aim at measuring the absolute neutrino mass scale.

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“…[18] and take into account the modified CI parametrization for the Yukawa couplings in the scotogenic model in Eq. (11). This procedure results in…”

Section: A Analytical Insightsmentioning

confidence: 99%

Low-scale leptogenesis in the scotogenic neutrino mass model

2018

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“…It will for example imply that there are at least two nearly degenerate RHN states, consistent with the general expectation from many TeV-scale seesaw models [45][46][47][48][49][50][51][52][53][54], which require the quasi-degeneracy to satisfy the neutrino oscillation data. This is also the requirement for successful resonant leptogenesis via the out-of-equilibrium decay of TeV scale RHNs [55,56].…”

Section: Coherence Conditions For Interferencementioning

confidence: 99%

Same sign versus opposite sign dileptons as a probe of low scale seesaw mechanisms

Das¹,

Dev²,

Mohapatra

2018

Phys. Rev. D

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We calculate the ratio R ll of same sign (SS) to opposite sign (OS) dileptons in type I and generalized inverse seesaw models and show that it can be anywhere between 0 and 1 depending on the detailed texture of the right-handed neutrino mass matrix. Measurement of R ll in hadron colliders can therefore provide a way to probe the nature of seesaw mechanism and also to distinguish between the two types of seesaw mechanisms. We work within the framework of left-right symmetric model as an example. We emphasize that coherence of the final states in the W R decay is crucial for this discussion and it requires the right-handed neutrinos to be highly degenerate. We isolate the range of parameters in the model where this effect is observable at the LHC and future colliders.

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“…In the type-I seesaw scenario the lepton-number-violating decays N i → α + H and N i → α + H are also CP-violating, thanks to the interference between their tree and one-loop (self-energy and vertex-correction) amplitudes [6,[12][13][14]. Given M 1 M 2 M 3 , however, the near degeneracy of M 1 and M 2 can make the one-loop self-energy contribution resonantly enhanced [41][42][43][44][45][46][47]. As a result, the flavor-dependent CP-violating asymmetries ε iα between N i → α + H and N i → α + H decays (for i = 1, 2 and α = e, µ, τ ) are dominated by the interference effect associated with the self-energy diagram [42,43]:…”

Section: Resonant Leptogenesismentioning

confidence: 99%

Bridging resonant leptogenesis and low-energy CP violation with an RGE-modified seesaw relation

Zhang

2020

Physics Letters B

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We propose a special type-I seesaw scenario in which the Yukawa coupling matrix Y ν can be fully reconstructed by using the light Majorana neutrino masses m i , the heavy Majorana neutrino masses M i and the PMNS lepton flavor mixing matrix U . It is the RGE-induced correction to the seesaw relation that helps interpret the observed baryonantibaryon asymmetry of the Universe via flavored resonant thermal leptogenesis with M 1 M 2 M 3 . We show that our idea works well in either the τ -flavored regime with equilibrium temperature T M 1 ∈ (10 9 , 10 12 ] GeV or the (µ + τ )-flavored regime with T M 1 ∈ (10 5 , 10 9 ] GeV, provided the light neutrinos have a normal mass ordering. We find that the same idea is also viable for a minimal type-I seesaw model with two nearly degenerate heavy Majorana neutrinos. *

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Resonant enhancement in leptogenesis

Cited by 105 publications

References 165 publications

Low-scale leptogenesis in the scotogenic neutrino mass model

Low-scale leptogenesis in the scotogenic neutrino mass model

Same sign versus opposite sign dileptons as a probe of low scale seesaw mechanisms

Bridging resonant leptogenesis and low-energy CP violation with an RGE-modified seesaw relation

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