Type-II seesaw mass models and baryon asymmetry

Sarma, Anil Kumar; Devi, H. Zeen; Singh, N. Nimai

doi:10.1016/j.nuclphysb.2006.12.002

Cited by 6 publications

(6 citation statements)

References 29 publications

(38 reference statements)

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“…For our numerical calculation we adopt the following expression for lepton CP asymmetry which is generally obtained from a perturbative calculation of tree and vertex plus self-energy terms [6,7,8], (2) where is the Yukawa coupling of the Dirac neutrino mass matrix in the basis where right-handed neutrino mass matrix is diagonal, and the functions are and…”

Section: Formalismmentioning

confidence: 99%

“…The CP asymmetry term can be related to the baryon asymmetry of the universe [7,8] by the expression (5) where is the constant considered for the SM case. k 1 is the washout factor due to various lepton number violating processes which mainly depends on the effective neutrino mass where v = 174 GeV is the electroweak vacuum expectation value (vev).…”

Section: Formalismmentioning

confidence: 99%

“…We choose a basis U R where the eigenvalues of heavy right-handed neutrino mass matrices, are real and positive [8]. In this basis the Dirac neutrino mass matrix m LR is no longer diagonal and it is now transformed to where is the complex matrix containing CP violating Majorana phases.…”

Section: Calculationmentioning

confidence: 99%

“…Considering the masses of charged leptons and quarks, we approximately take the value of (m, n) as (4,2) for down quark mass matrix, (6,2) for charged lepton mass matrix and (8,4) stage of testing the models, they show good predictions on mass parameters and three mixings [8] and there is no discrimination among these models. As a continuation for further discrimination, we present the predictions on baryon asymmetry of the universe from all these models in Table 1 using the same values of parameters already fixed [9].…”

Section: Calculationmentioning

confidence: 99%

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Discrimination of neutrino mass models

Singh

Devi

Sarma³

et al. 2010

Indian J Phys

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We consider the Majorana CP violating phases derived from right-handed Majorana mass matrices to estimate the baryon asymmetry of the universe, for different neutrino mass models, namely degenerate, inverted hierarchical and normal hierarchical models, with tri-bimaximal mixings. Considering three possible diagonal forms of Dirac neutrino mass matrix as charged-lepton, up-quark or down-quark mass matrix within the framework of left-right symmetric GUT models, the right-handed Majorana mass matrices are constructed from the light Majorana neutrino mass matrix through the inverse seesaw formula. These light neutrino mass matrices have already been tested to provide good predictions on neutrino mass parameters and mixing angles. They are again applied to predict baryon asymmetry of the universe in the present work. The normal hierarchical model gives the best prediction for baryon asymmetry, consistent with observation. The analysis may serve as additional information in the discrimination of the presently available neutrino mass models.

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Section: Formalismmentioning

confidence: 99%

Section: Formalismmentioning

confidence: 99%

Section: Calculationmentioning

confidence: 99%

Section: Calculationmentioning

confidence: 99%

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Discrimination of neutrino mass models

Singh

Devi

Sarma³

et al. 2010

Indian J Phys

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“…This scalar triplet couples to the SM lepton doublets and features a neutral scalar that develops a small vacuum expectation value giving rise to tiny neutrino masses [6][7][8][9][10]. This mechanism can elegantly explain the masses of the three active neutrinos in the SM and lead to several phenomenological imprints in collider, low energy observables and leptogenesis [11,12,[12][13][14][15][16][17].…”

mentioning

confidence: 99%

Lepton flavor violation and collider searches in a type I + II seesaw model

et al. 2019

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Neutrino are massless in the Standard Model. The most popular mechanism to generate neutrino masses are the type I and type II seesaw, where right-handed neutrinos and a scalar triplet are augmented to the Standard Model, respectively. In this work, we discuss a model where a type I + II seesaw mechanism naturally arises via spontaneous symmetry breaking of an enlarged gauge group. Lepton flavor violation is a common feature in such setup and for this reason, we compute the model contribution to the µ → eγ and µ → 3e decays. Moreover, we explore the connection between the neutrino mass ordering and lepton flavor violation in perspective with the LHC, HL-LHC and HE-LHC sensitivities to the doubly charged scalar stemming from the Higgs triplet. Our results explicitly show the importance of searching for signs of lepton flavor violation in collider and muon decays. The conclusion about which probe yields stronger bounds depends strongly on the mass ordering adopted, the absolute neutrino masses and which much decay one considers. In the 1 − 5 TeV mass region of the doubly charged scalar, lepton flavor violation experiments and colliders offer orthogonal and complementary probes. Thus if a signal is observed in one of the two new physics searches, the other will be able to assess whether it stems from a seesaw framework.

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Choice of Majorana phases in leptogenesis

Sarma¹,

Devi

2012

Indian J Phys

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Type-II seesaw mass models and baryon asymmetry

Cited by 6 publications

References 29 publications

Discrimination of neutrino mass models

Discrimination of neutrino mass models

Lepton flavor violation and collider searches in a type I + II seesaw model

Choice of Majorana phases in leptogenesis

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