Naturalness, vacuum stability, and leptogenesis in the minimal seesaw model

Bambhaniya, G.; Dev, P. S. Bhupal; Goswami, Sumanta; Khan, Subrata; Rodejohann, Werner

doi:10.1103/physrevd.95.095016

Cited by 98 publications

(88 citation statements)

References 126 publications

(65 reference statements)

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“…Since a hierarchical spectrum of righthanded neutrinos cannot give rise to the required asymmetry at TeV scale, this mechanism gives a resonance enhancement to the lepton asymmetry by considering a very small mass splitting between the two heavy neutrinos, of the order of their average decay width. The lepton asymmetry can be found from the following formula [36,37],…”

Section: Resonant Leptogenesismentioning

confidence: 99%

Common origin of nonzero θ13 and baryon asymmetry of the Universe in a TeV scale seesaw model with A4 flavor symmetry

2018

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We study the possibility of generating nonzero reactor mixing angle θ 13 and baryon asymmetry of the Universe within the framework of an A 4 flavor symmetric model. Using the conventional type I seesaw mechanism we construct the Dirac and Majorana mass matrices that give rise to the correct light neutrino mass matrix. Keeping the right-handed neutrino mass matrix structure trivial so that it gives rise to a (quasi) degenerate spectrum of heavy neutrinos suitable for resonant leptogenesis at TeV scale, we generate the nontrivial structure of Dirac neutrino mass matrix that can lead to the light neutrino mixing through the type I seesaw formula. Interestingly, such a setup naturally leads to nonzero θ 13 due to the existence of antisymmetric contraction of the product of two triplet representations of A 4 . Such an antisymmetric part of the triplet products usually vanishes for right-handed neutrino Majorana mass terms, leading to μ − τ symmetric scenarios in the most economical setups. We constrain the model parameters from the requirement of producing the correct neutrino data as well as baryon asymmetry of the Universe for righthanded neutrino mass scale around TeV. The A 4 symmetry is augmented by additional Z 3 × Z 2 symmetry to make sure that the splitting between right-handed neutrinos required for resonant leptogenesis is generated only by next to leading order terms, making it naturally small. We find that the inverted hierarchical light neutrino masses give more allowed parameter space consistent with neutrino and baryon asymmetry data.

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Section: Resonant Leptogenesismentioning

confidence: 99%

Common origin of nonzero θ13 and baryon asymmetry of the Universe in a TeV scale seesaw model with A4 flavor symmetry

2018

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“…3 Some recent studies on the minimal seesaw model can be found in Refs. [48][49][50][51][52][53][54][55][56][57][58][59][60][61][62].…”

Section: Introductionmentioning

confidence: 99%

$$ \mu -\tau $$ μ - τ reflection symmetry embedded in minimal seesaw

Nath¹,

Zhang²,

Zhang³

2018

Eur. Phys. J. C

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We embed μ − τ reflection symmetry into the minimal seesaw formalism, where two right-handed neutrinos are added to the Standard Model of particle physics. Assuming that both the left-and right-handed neutrino fields transform under μ − τ reflection symmetry, we obtain the required forms of the neutrino Dirac mass matrix and the Majorana mass matrix for the right-handed neutrinos. To investigate the neutrino phenomenology at low energies, we first consider the breaking of μ − τ reflection symmetry due to the renormalization group running, and then systematically study various breaking schemes by introducing explicit breaking terms at high energies.

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“…Although the mass scale of these RH neutrinos is a priori unknown, the possibility of having them close to the TeV scale has received much attention in recent years, as this scenario could be directly tested in the ongoing Large Hadron Collider (LHC) experiments [6,7], as well as indirectly probed in various low-energy searches for rare lepton number violation (LNV) and/or lepton flavor violation (LFV) [8]. There are also theoretical arguments based on naturalness of the observed 125 GeV Higgs mass, which suggest the seesaw scale to be below ∼ 10 7 GeV [9][10][11], thereby making the case of low-scale seesaw more compelling.…”

Section: Introductionmentioning

confidence: 99%

Probing left-right seesaw models using beam polarization at an e+e− collider

Biswal

Dev²

2017

Phys. Rev. D

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We show that the longitudinal beam polarization option at a future electron-positron collider provides an unambiguous distinction between low-scale seesaw models of neutrino mass. This is possible due to the fact that the pair production cross section of the heavy neutrinos in seesaw models is sensitive to the polarization of the initial lepton beams, and for a suitable choice of the polarization, shows a clear enhancement over the unpolarized cross section. More interestingly, the choice of the beam polarization for which the enhancement is maximum is governed by the size of the light-heavy neutrino mixing parameter. We also find that using this effect, one can probe a previously uncharted parameter space of the left-right seesaw model, which is complementary to the existing searches at both energy and intensity frontiers.

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Naturalness, vacuum stability, and leptogenesis in the minimal seesaw model

Cited by 98 publications

References 126 publications

Common origin of nonzero θ13 and baryon asymmetry of the Universe in a TeV scale seesaw model with A4 flavor symmetry

Common origin of nonzero θ13 and baryon asymmetry of the Universe in a TeV scale seesaw model with A4 flavor symmetry

$$ \mu -\tau $$ μ - τ reflection symmetry embedded in minimal seesaw

Probing left-right seesaw models using beam polarization at an e+e− collider

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