Resonant Leptogenesis, Collider Signals and Neutrinoless Double Beta Decay from Flavor and CP Symmetries

Chauhan, Garv; Dev, P. S. Bhupal

doi:10.48550/arxiv.2112.09710

Cited by 3 publications

(6 citation statements)

References 155 publications

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“…(6.35) Similar to Case 1), we have checked explicitly that the dependencies on the parameters φ u , φ v , θ L and θ R , given in eq. (6.23), coincide with those, found in [38], see equation (4.13). This is expected, since for s and t both even C LNV,α is the negative of C LFV,α .…”

Section: Jhep12(2022)044supporting

confidence: 88%

“…) and thus has the same dependence on the parameters s, y f , θ L and θ R as the flavoured decay asymmetries in [38], compare equation (4.10). This is expected from eqs.…”

Section: Jhep12(2022)044mentioning

confidence: 87%

“…The recent work [38] studies resonant leptogenesis in a low-scale type-I seesaw scenario with the same flavour and CP symmetries. For strong NO and s even, we notice that the combination 1 2 C LFV,α − C LNV,α , obtained by subtracting eqs.…”

Section: Jhep12(2022)044mentioning

confidence: 99%

“…Leptogenesis has been discussed in several scenarios with flavour (and CP) symmetries, see e.g [29]. for a concise review as well as the following publications for explicit examples[30][31][32][33][34][35][36][37][38].…”

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confidence: 99%

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Low-scale leptogenesis with flavour and CP symmetries

Drewes

Georis

Hagedorn

et al. 2022

J. High Energ. Phys.

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We consider a type-I seesaw framework endowed with a flavour symmetry, belonging to the series of non-abelian groups ∆(3 n2) and ∆(6 n2), and a CP symmetry. Breaking these symmetries in a non-trivial way results in the right-handed neutrinos being degenerate in mass up to possible (further symmetry-breaking) splittings κ and λ, while the neutrino Yukawa coupling matrix encodes the entire flavour structure in the neutrino sector. For a fixed combination of flavour and CP symmetry and residual groups, this matrix contains five real free parameters. Four of them are determined by the light neutrino mass spectrum and by accommodating experimental data on lepton mixing well, while the angle θR is related to right-handed neutrinos. We scrutinise for all four lepton mixing patterns, grouped into Case 1) through Case 3 b.1), the potential to generate the baryon asymmetry of the Universe through low-scale leptogenesis numerically and analytically. The main results are: a) the possible correlation of the baryon asymmetry and the Majorana phases, encoded in the Pontecorvo-Maki-Nakagawa-Sakata mixing matrix, in certain instances; b) the possibility to generate the correct amount of baryon asymmetry for vanishing splittings κ and λ among the right-handed neutrinos as well as for large κ, depending on the case and the specific choice of group theory parameters; c) the chance to produce sufficient baryon asymmetry for large active-sterile mixing angles, enabling direct experimental tests at current and future facilities, if θR is close to a special value, potentially protected by an enhanced residual symmetry. We elucidate these results with representative examples of flavour and CP symmetries, which all lead to a good agreement with the measured values of the lepton mixing angles and, possibly, the current indication of the CP phase δ. We identify the CP-violating combinations relevant for low-scale leptogenesis, and show that the parametric dependence of the baryon asymmetry found in the numerical study can be understood well with their help.

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Section: Jhep12(2022)044supporting

confidence: 88%

“…) and thus has the same dependence on the parameters s, y f , θ L and θ R as the flavoured decay asymmetries in [38], compare equation (4.10). This is expected from eqs.…”

Section: Jhep12(2022)044mentioning

confidence: 87%

Section: Jhep12(2022)044mentioning

confidence: 99%

mentioning

confidence: 99%

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Low-scale leptogenesis with flavour and CP symmetries

Drewes

Georis

Hagedorn

et al. 2022

J. High Energ. Phys.

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“…Several applications of the RL formalism (e.g. [45][46][47][48][49][50][51]) exploit the bi-resonant enhancement of CP violating effects due to the mixing of two Majorana neutrinos, while the contribution to the CP asymmetry due a third singlet neutrino is either absent due to the neutrino mass model choice, or negligible when compared to the one generated in the decays of the resonating pair. However, in a model with three right-handed neutrinos, in the region where the masses of the heavy neutrinos satisfy the resonance condition…”

Section: Jhep11(2022)065mentioning

confidence: 99%

Tri-resonant leptogenesis in a seesaw extension of the Standard Model

Silva

Karamitros

et al. 2022

J. High Energ. Phys.

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We study a class of leptogenesis models where the light neutrinos acquire their observed small masses by a symmetry-motivated construction. This class of models may naturally include three nearly degenerate heavy Majorana neutrinos that can strongly mix with one another and have mass differences comparable to their decay widths. We find that such a tri-resonant heavy neutrino system can lead to leptonic CP asymmetries which are further enhanced than those obtained in the usual bi-resonant approximation. Moreover, we solve the Boltzmann equations by paying special attention to the temperature dependence of the relativistic degrees of freedom of the plasma. The latter results in significant corrections to the evolution equations for the heavy neutrinos and the lepton asymmetry that have been previously ignored in the literature. We show the importance of these corrections to accurately describe the dynamical evolution of the baryon-to-photon ratio ηB for heavy neutrino masses at and below 100 GeV, and demonstrate that successful leptogenesis at lower masses can be significantly affected by the variation of the relativistic degrees of freedom. The parameter space for the leptogenesis model is discussed, and it could be probed in future experimental facilities searching for charged lepton flavour violation and heavy neutrinos in future Z-boson factories.

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Leptogenesis in an extended seesaw model with U(1)_B−L symmetry

Dey¹,

Jha²,

Mukherjee³

et al. 2022

J. Phys. G: Nucl. Part. Phys.

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We have explored an extended seesaw model accommodating a keV sterile neutrino adopting U(1)B-L symmetry. This model provides a natural platform for achieving resonant leptogenesis to account for the observed baryon asymmetry of the Universe. The required lepton asymmetry is sourced by the CP violating decay of the lightest heavy right handed neutrino to Standard Model leptons and Higgs. The presence of the light sterile neutrino in the model brings out an enhancement in the ﬁnal lepton asymmetry through an additional self-energy contribution. Adopting a proper treatment for all the washout processes this framework strictly favours a strong washout regime thereby protecting the low energy neutrino mass parameters in agreement with the present neutrino and cosmology data. This framework of extended seesaw scheme oﬀers the source of matter-antimatter asymmetry without any severe ﬁne tuning of the Yukawa couplings governing the tiny neutrino mass. We also comment on the half-life period for the neutrino less double beta decay process in the background of having a keV sterile neutrino satisfying all the constraints which guide the explanation for the observed baryon asymmetry of the Universe.

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Resonant Leptogenesis, Collider Signals and Neutrinoless Double Beta Decay from Flavor and CP Symmetries

Cited by 3 publications

References 155 publications

Low-scale leptogenesis with flavour and CP symmetries

Low-scale leptogenesis with flavour and CP symmetries

Tri-resonant leptogenesis in a seesaw extension of the Standard Model

Leptogenesis in an extended seesaw model with U(1)_B−L symmetry

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Resonant Leptogenesis, Collider Signals and Neutrinoless Double Beta Decay from Flavor and CP Symmetries

Cited by 3 publications

References 155 publications

Low-scale leptogenesis with flavour and CP symmetries

Low-scale leptogenesis with flavour and CP symmetries

Tri-resonant leptogenesis in a seesaw extension of the Standard Model

Leptogenesis in an extended seesaw model with U(1) B−L symmetry

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Product

Resources

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Leptogenesis in an extended seesaw model with U(1)_B−L symmetry