Discriminating Majorana neutrino textures in light of the baryon asymmetry

Borah, Manikanta; Borah, Debasish; Das, Mrinal Kumar

doi:10.1103/physrevd.91.113008

Cited by 39 publications

(40 citation statements)

References 69 publications

(60 reference statements)

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“…Such a procedure yields a negative final value of Y B contrary to the result obtained in the χ 2 = 0.003 case. For the other data points also, Y B varies widely with the parameters of m D from one neutrino mass model to another [32][33][34][35]. This conclusion is true for all mass regimes (except for M 1 > 10 12 GeV, where λ ε λ 1 = 0 and hence Y B vanishes) as well as for an inverted mass ordering of the light neutrinos.…”

mentioning

confidence: 85%

Baryon asymmetry via leptogenesis in a neutrino mass model with complex scaling

Samanta

Chakraborty

Roy

et al. 2017

J. Cosmol. Astropart. Phys.

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Baryogenesis via leptogenesis is investigated in a specific model of light neutrino masses and mixing angles. The latter was proposed on the basis of an assumed complex-extended scaling property of the neutrino Majorana mass matrix M ν , derived with a type-1 seesaw from a Dirac mass matrix m D and a heavy singlet neutrino Majorana mass matrix M R . One of its important features, highlighted here, is that there is a common source of the origin of a nonzero θ 13 and the CP violating lepton asymmetry through the imaginary part of m D . The model predicted CP violation to be maximal for the Dirac type and vanishing for the Majorana type. We assume strongly hierarchical mass eigenvalues for M R . The leptonic CP asymmetry parameter ε α 1 with lepton flavor α, originating from the decays of the lightest of the heavy neutrinos N 1 (of mass M 1 ) at a temperature T ∼ M 1 , is what matters here with the lepton asymmetries, originating from the decays of N 2,3 , being washed out. The light leptonic and heavy neutrino number densities (normalized to the entropy density) are evolved via Boltzmann equations down to electroweak temperatures to yield a baryon asymmetry through sphaleronic transitions. The effects of flavored vs. unflavored leptogenesis in the three mass regimes (1) M 1 < 10 9 GeV, (2) 10 9 GeV < M 1 < 10 12 GeV and (3) M 1 > 10 12 GeV are numerically worked out for both a normal and an inverted mass ordering of the light neutrinos. Corresponding results on the baryon asymmetry of the universe are obtained, displayed and discussed. For values close to the best-fit points of the input neutrino mass and mixing parameters, obtained from neutrino oscillation experiments, successful baryogenesis is achieved for the mass regime (2) and a normal mass ordering of the light neutrinos with a nonzero θ 13 playing a crucial role. However, the other possibility of an inverted mass ordering for the same mass regime, though disfavored, cannot be excluded. A discussion is also given on the sensitivity of our result to the masses M 2,3 of the heavier neutrinos N 2,3 .

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mentioning

confidence: 85%

Baryon asymmetry via leptogenesis in a neutrino mass model with complex scaling

Samanta

Chakraborty

Roy

et al. 2017

J. Cosmol. Astropart. Phys.

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“…These approximated analytical results will be extremely helpful to comprehend the phenomenological predictions obtained from the numerical analysis which is based on the exact constraining Eqns. (18) and (19).…”

Section: Phenomenological Consequences Of the Modelmentioning

confidence: 96%

Highly predictive and testable A4 flavor model within type-I and II seesaw framework and associated phenomenology

2019

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We investigate neutrino mass model based on A4 discrete flavor symmetry in type-I+II seesaw framework. The model has imperative predictions for neutrino masses, mixing and CP violation testable in the current and upcoming neutrino oscillation experiments. The important predictions of the model are: normal hierarchy for neutrino masses, a higher octant for atmospheric angle (θ23 > 45 o ) and near-maximal Dirac-type CP phase (δ ≈ π/2 or 3π/2) at 3σ C. L.. These predictions are in consonance with the latest global-fit and results from Super-Kamiokande(SK), NOνA and T2K. Also, one of the important feature of the model is the existence of a lower bound on effective Majorana mass, |Mee| ≥ 0.047eV(at 3σ) which corresponds to the lower part of the degenerate spectrum and is within the sensitivity reach of the neutrinoless double beta decay(0νββ) experiments.

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“…For evaluating M RR , we need to know M ν II , as evident from equation (37). We computed M ν II from equation (38). as a function of the atmospheric mixing angle θ 23 .…”

Section: Lepton Flavor Violationmentioning

confidence: 99%

Lepton Number Violation and Lepton Flavour Violation in Left-Right Symmetric Model

Borgohain

Das

2018

XXII DAE High Energy Physics Symposium

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We did a model independent phenomenological study of baryogenesis via leptogenesis, neutrinoless double beta decay (NDBD) and charged lepton flavour violation (CLFV) in a generic left-right symmetric model (LRSM) where neutrino mass originates from the type I + type II seesaw mechanism. We studied the new physics contributions to NDBD coming from the left-right gauge boson mixing and the heavy neutrino contribution within the framework of LRSM. We have considered the mass of the RH gauge boson to be specifically 5 TeV, 10 TeV and 18 TeV and studied the effects of the new physics contributions on the effective mass and baryogenesis and compared with the current experimental limit. We tried to correlate the cosmological BAU from resonant leptogenesis with the low energy observables, notably, NDBD and LFV with a view to finding a common parameter space where they coexists.

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Discriminating Majorana neutrino textures in light of the baryon asymmetry

Cited by 39 publications

References 69 publications

Baryon asymmetry via leptogenesis in a neutrino mass model with complex scaling

Baryon asymmetry via leptogenesis in a neutrino mass model with complex scaling

Highly predictive and testable A4 flavor model within type-I and II seesaw framework and associated phenomenology

Lepton Number Violation and Lepton Flavour Violation in Left-Right Symmetric Model

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