Tri-Resonant Leptogenesis in a Seesaw Extension of the Standard Model

Silva, P. Candia da; Karamitros, D.; T., McKelvey,; Pilaftsis, A.

doi:10.48550/arxiv.2206.08352

Cited by 2 publications

(2 citation statements)

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“…Finally, the agreement between both approaches also supports their use for a joint analysis of freeze-in and freeze-out leptogenesis, although issues related to the helicity degree of freedom cannot be captured in the scalar toy model we have employed and might be interesting to address in future works. Another possibility worth considering for future research along the lines of this work is the tri-resonant heavy neutrino system [39], consisting of three nearly degenerate neutrinos.…”

Section: Discussionmentioning

confidence: 99%

On different approaches to freeze-in and freeze-out leptogenesis with quasi-degenerate neutrinos

Racker

2023

Eur. Phys. J. C

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We compare two approaches for determining the generation of lepton asymmetry during production and decay of quasi-degenerate neutrinos, namely the density matrix formalism and a recent proposal which does not involve any counting of neutrino number densities and is based on plugging the resummed propagator in a quantum field theory model for neutrino oscillations. We show numerically and analytically that they are almost equivalent for small mass splittings and also discuss the hierarchical limit. The comparison, performed in a simple scalar toy model, helps to understand several issues that have been discussed in the literature.

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Section: Discussionmentioning

confidence: 99%

On different approaches to freeze-in and freeze-out leptogenesis with quasi-degenerate neutrinos

Racker

2023

Eur. Phys. J. C

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“…In [13], we consider a class of leptogenesis models which can provide naturally light SM neutrino masses as well as generate appreciable levels of BAU to match the observed CMB data. We assume these models to contain three singlet neutrinos, which have mass splittings comparable to their decay widths, permitting maximal mixing between the heavy eigenstates.…”

Section: Introductionmentioning

confidence: 99%

Tri-Resonant Leptogenesis

Pilaftsis,

Candia da Silva,

Karamitros

et al. 2023

Proceedings of Corfu Summer Institute 2022 "School and Workshops on Elementary Particle Physics and Gravity" — PoS(CORFU2022)

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We present a class of leptogenesis models where the light neutrinos acquire their observed mass through a symmetry-motivated construction. We consider an extension of the Standard Model, which includes three singlet neutrinos which have mass splittings comparable to their decay widths. We show that this tri-resonant structure leads to an appreciable increase in the observed CP asymmetry over that found previously in typical bi-resonant models. To analyse such triresonant scenarios, we solve a set of coupled Boltzmann equations, crucially preserving the variations in the relativistic degrees of freedom. We highlight the fact that small variations at high temperatures can have major implications for the evolution of the baryon asymmetry when the singlet neutrino mass scale is below 100 GeV. We then illustrate how this variation can significantly affect the ability to find successful leptogenesis at these low masses. Finally, the parameter space for viable leptogenesis is delineated, and comparisons are made with current and future experiments.

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Tri-Resonant Leptogenesis in a Seesaw Extension of the Standard Model

Cited by 2 publications

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On different approaches to freeze-in and freeze-out leptogenesis with quasi-degenerate neutrinos

On different approaches to freeze-in and freeze-out leptogenesis with quasi-degenerate neutrinos

Tri-Resonant Leptogenesis

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