The minimal seesaw and leptogenesis models

Zhang, Xing; Zhao, Zhen-hua

doi:10.1088/1361-6633/abf086

Cited by 53 publications

(32 citation statements)

References 354 publications

(528 reference statements)

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“…The choice M 1 M corresponds to the νMSM. A collection of "top down" considerations that can also address the flavour puzzle can be found in [812][813][814][815] and references therein. Quite remarkably, combining all these arguments leads to a self-consistent picture in which the model ( 99) is a complete EFT up to the Planck scale that [797] can simultaneously explain the neutrino masses, baryogenesis and DM [30,[816][817][818] for M ∼ v and M 1 in the keV range.…”

Section: An Explicit Example Of Low Scale Seesaw Models: the Pure Type I Seesawmentioning

confidence: 99%

Feebly-interacting particles: FIPs 2020 workshop report

et al. 2021

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With the establishment and maturation of the experimental programs searching for new physics with sizeable couplings at the LHC, there is an increasing interest in the broader particle and astrophysics community for exploring the physics of light and feebly-interacting particles as a paradigm complementary to a New Physics sector at the TeV scale and beyond. FIPs 2020 has been the first workshop fully dedicated to the physics of feebly-interacting particles and was held virtually from 31 August to 4 September 2020. The workshop has gathered together experts from collider, beam dump, fixed target experiments, as well as from astrophysics, axions/ALPs searches, current/future neutrino experiments, and dark matter direct detection communities to discuss progress in experimental searches and underlying theory models for FIPs physics, and to enhance the cross-fertilisation across different fields. FIPs 2020 has been complemented by the topical workshop “Physics Beyond Colliders meets theory”, held at CERN from 7 June to 9 June 2020. This document presents the summary of the talks presented at the workshops and the outcome of the subsequent discussions held immediately after. It aims to provide a clear picture of this blooming field and proposes a few recommendations for the next round of experimental results.

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Section: An Explicit Example Of Low Scale Seesaw Models: the Pure Type I Seesawmentioning

confidence: 99%

Feebly-interacting particles: FIPs 2020 workshop report

et al. 2021

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“…See, e.g., refs. [29,30], for recent reviews on the MSM. The main motivation for such an investigation is two-fold.…”

Section: Jhep10(2021)017mentioning

confidence: 99%

Hilbert series for leptonic flavor invariants in the minimal seesaw model

Zhou

2021

J. High Energ. Phys.

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In this paper, we examine the leptonic flavor invariants in the minimal see-saw model (MSM), in which only two right-handed neutrino singlets are added into the Standard Model in order to accommodate tiny neutrino masses and explain cosmological matter-antimatter asymmetry via leptogenesis mechanism. For the first time, we calculate the Hilbert series (HS) for the leptonic flavor invariants in the MSM. With the HS we demonstrate that there are totally 38 basic flavor invariants, among which 18 invariants are CP-odd and the others are CP-even. Moreover, we explicitly construct these basic invariants, and any other flavor invariants in the MSM can be decomposed into the polynomials of them. Interestingly, we find that any flavor invariants in the effective theory at the low-energy scale can be expressed as rational functions of those in the full MSM at the high-energy scale. Practical applications to the phenomenological studies of the MSM, such as the sufficient and necessary conditions for CP conservation and CP asymmetries in leptogenesis, are also briefly discussed.

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“…One approach is to constrain its flavor structure by employing some flavor symmetry such as the aforementioned trimaximal symmetry (i.e., the flavor symmetry associated with the trimaximal mixing) and µ-τ reflection symmetry. The other approach is to reduce the number of right-handed neutrino fields to two (i.e., the minimal seesaw model [38][39][40][41][42][43][44]), in which case the lightest neutrino mass remains to be vanishing (i.e., m 1 = 0 in the NO case or m 3 = 0 in the IO case) and only one Majorana CP phase is physically relevant (σ in the NO case or σ − ρ in the IO case). ( 2) The conventional seesaw scale is too high to be accessed by current experiments.…”

Section: Jhep11(2021)170mentioning

confidence: 99%

Renormalization group evolution induced leptogenesis in the minimal seesaw model with the trimaximal mixing and mu-tau reflection symmetry

Zhao

2021

J. High Energ. Phys.

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In this paper, we consider the imbedding of the popular and well-motivated trimaximal mixing and μ–τ reflection symmetry (which can help us shape the forms of the neutrino mass matrix) in the minimal seesaw model (which contains much fewer parameters than the general seesaw model) with two TeV-scale right-handed neutrinos (for realizing a low-scale seesaw) of nearly degenerate masses (for realizing a resonant leptogenesis). However, either for the trimaximal mixing scenario (which is realized through the Form Dominance approach here) or for the μ–τ reflection symmetry scenario, leptogenesis cannot proceed. To address this issue, we consider the possibility that the special forms of the neutrino mass matrix for the trimaximal mixing and μ–τ reflection symmetry are slightly broken by the renormalization group evolution effect, thus allowing leptogenesis to proceed. It is found that in the normal case of the neutrino mass ordering, the baryon asymmetry thus generated can reproduce the observed value. For completeness, we have also extended our analysis to the scenario that two right-handed neutrinos are not nearly degenerate any more. Unfortunately, in this scenario the final baryon asymmetry is smaller than the observed value by several orders of magnitude.

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The minimal seesaw and leptogenesis models

Cited by 53 publications

References 354 publications

Feebly-interacting particles: FIPs 2020 workshop report

Feebly-interacting particles: FIPs 2020 workshop report

Hilbert series for leptonic flavor invariants in the minimal seesaw model

Renormalization group evolution induced leptogenesis in the minimal seesaw model with the trimaximal mixing and mu-tau reflection symmetry

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