Degenerate minimal see-saw and leptogenesis

Turzyński, Krzysztof

doi:10.1016/j.physletb.2004.03.071

Cited by 57 publications

(62 citation statements)

References 36 publications

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“…Another possibility which has been recently explored [16,17] relies on the fact that radiative effects, induced by the renormalization group (RG) running from high to low energies, can naturally lead to a sufficiently small neutrino mass splitting at the leptogenesis scale. In the latter case, sufficiently large CP asymmetries are generated.…”

Section: Preliminariesmentioning

confidence: 99%

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Another look at minimal lepton flavour violation, leptogenesis and the ratioM_ν/Λ_LFV

Branco

Buras

Jäger

et al. 2007

J. High Energy Phys.

127

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We analyze lepton flavour violation (LFV), as well as generation of the observed baryon-antibaryon asymmetry of the Universe (BAU) within a generalized minimal lepton flavour violation (MLFV) framework where we allow for CP violation both at low and high energies. The generation of BAU is obtained through radiative resonant leptogenesis (RRL), where starting with three exactly degenerate right-handed neutrinos at Λ GUT , we demonstrate explicitly within the SM and the MSSM that the splittings between their masses at the see-saw scale M ν , generated by renormalization group effects, are sufficient for a successful leptogenesis for M ν even as low as 10 6 GeV. The inclusion of flavour effects plays an important role in this result and can lead to the observed BAU even in the absence of CP violation beyond the PMNS phases. The absence of a stringent lower bound on M ν in this type of leptogenesis allows to easily satisfy present and near future upper bounds on µ → eγ and other charged lepton flavour violating (LFV) processes even for Λ LFV = O(1 TeV). We find, that the MLFV framework in the presence of heavy righthanded neutrinos and leptogenesis is not as predictive as MFV in the quark sector and point out that without a specific MLFV model, there is a rich spectrum of possibilities for charged LFV processes and for their correlation with low energy neutrino physics and the LHC physics, even if the constraint from the observed BAU is taken into account. While certain qualitative features of our analysis confirm findings of Cirigliano et al., at the quantitative level we find phenomenologically important differences. We explain the origin of these differences.

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Section: Preliminariesmentioning

confidence: 99%

“…On the other hand, this mechanism can be successfully implemented in its minimal supersymmetric extension (MSSM) [17].…”

Section: Preliminariesmentioning

confidence: 99%

Another look at minimal lepton flavour violation, leptogenesis and the ratioM_ν/Λ_LFV

Branco

Buras

Jäger

et al. 2007

J. High Energy Phys.

127

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“…46 Explicitly, 47 27) where r 23 ≡ m 2 /m 3 has been defined before. We see that the running effects of these five parameters are all governed by f 2 τ .…”

Section: Radiative Correctionsmentioning

confidence: 99%

“…The possibility that r is radiatively generated has been studied in detail in the supersymmetric version of the MSM for both normal and inverted neutrino mass hierarchies. 27 In the absence of supersymmetry and in the presence of one texture zero in M D , however, it is impossible to achieve successful resonant leptogenesis from the radiative generation of r. 26 Flavor effects in the mechanism of thermal leptogenesis have recently attracted a lot of attention. 53 Because all the Yukawa interactions of charged leptons are in thermal equilibrium at the TeV scale, the flavor issue should be taken into account in our model.…”

Section: Resonant Leptogenesismentioning

confidence: 99%

Neutrino Masses, Lepton Flavor Mixing and Leptogenesis in the Minimal Seesaw Model

Guo

Zhang

Zhou

2007

Int. J. Mod. Phys. E

121

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We present a review of neutrino phenomenology in the minimal seesaw model (MSM), an economical and intriguing extension of the Standard Model with only two heavy right-handed Majorana neutrinos. Given current neutrino oscillation data, the MSM can predict the neutrino mass spectrum and constrain the effective masses of the tritium beta decay and the neutrinoless double-beta decay. We outline five distinct schemes to parameterize the neutrino Yukawa-coupling matrix of the MSM. The lepton flavor mixing and baryogenesis via leptogenesis are investigated in some detail by taking account of possible texture zeros of the Dirac neutrino mass matrix. We derive an upper bound on the CP-violating asymmetry in the decay of the lighter right-handed Majorana neutrino. The effects of the renormalization-group evolution on the neutrino mixing parameters are analyzed, and the correlation between the CP-violating phenomena at low and high energies is highlighted. We show that the observed matter-antimatter asymmetry of the Universe can naturally be interpreted through the resonant leptogenesis mechanism at the TeV scale. The lepton-flavor-violating rare decays, such as µ → e + γ, are also discussed in the supersymmetric extension of the MSM.

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“…It has been argued that neglecting quantum effects in the dynamics of leptogenesis introduces theoretical uncertainties as large as an order of magnitude [16]. Furthermore, the bounds discussed above do not apply to models with pre-BBN decays of the NLSP [17][18][19], nor to models with degenerate masses of the right handed neutrinos, see e.g., [20,21], nor to models with large cancellations in the seesaw mass formula [22,23]. We also note that the reheating temperature may be lowered in models of nonthermal leptogenesis, see e.g., [24,25], or in soft leptogenesis, see [26][27][28].…”

Section: Thermal Leptogenesis Requirementsmentioning

confidence: 99%

Supersymmetric mass spectra for gravitino dark matter with a high reheating temperature

Covi

Olechowski

Pokorski

et al. 2011

J. High Energ. Phys.

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Supersymmetric theories with gravitino dark matter generally do not allow the high reheating temperature required by thermal leptogenesis without running afoul of relic abundance or big bang nucleosynthesis constraints. We report on a search for parameter space that satisfies these requirements with neutralino as the next-to-lightest superpartner. The main implication is the near degeneracy of the gluino with the other neutralinos in the spectrum. The leading discovery channel at the LHC for this scenario is through monojet plus missing energy events.

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Degenerate minimal see-saw and leptogenesis

Cited by 57 publications

References 36 publications

Another look at minimal lepton flavour violation, leptogenesis and the ratioM_ν/Λ_LFV

Another look at minimal lepton flavour violation, leptogenesis and the ratioM_ν/Λ_LFV

Neutrino Masses, Lepton Flavor Mixing and Leptogenesis in the Minimal Seesaw Model

Supersymmetric mass spectra for gravitino dark matter with a high reheating temperature

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Degenerate minimal see-saw and leptogenesis

Cited by 57 publications

References 36 publications

Another look at minimal lepton flavour violation, leptogenesis and the ratioMν/ΛLFV

Another look at minimal lepton flavour violation, leptogenesis and the ratioMν/ΛLFV

Neutrino Masses, Lepton Flavor Mixing and Leptogenesis in the Minimal Seesaw Model

Supersymmetric mass spectra for gravitino dark matter with a high reheating temperature

Contact Info

Product

Resources

About

Another look at minimal lepton flavour violation, leptogenesis and the ratioM_ν/Λ_LFV

Another look at minimal lepton flavour violation, leptogenesis and the ratioM_ν/Λ_LFV