On a model with two zeros in the neutrino mass matrix

Grimus, Walter; Lavoura, L.

doi:10.1088/0954-3899/31/7/014

Cited by 63 publications

(90 citation statements)

References 30 publications

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“…Finally, the texture C only allows for IO using both values of θ 23 while the NO in the case of the current best fit values is not consistent (in other words, as explained in [14], this texture predicts θ 23 to be almost maximal). In addition, in this case the Dirac CPV phase is drifting apart from its maximal value.…”

Section: (32)mentioning

confidence: 82%

Two-zero Majorana textures in the light of the Planck results

2014

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The recent results of the Planck experiment put a stringent constraint on the sum of the light neutrino masses, Σ i m i < 0.23 eV (95% CL). On the other hand, two-zero Majorana mass matrix textures predict strong correlations among the atmospheric angle sin 2 θ 23 and Σ. We use the Planck result to show that, for the normal hierarchy case, the texture with vanishing (2, 2) and (3, 3) elements is ruled out at a high confidence level; in addition, we emphasize that a future measurement of the octant of θ 23 (or the 1σ determination of it based on recent fit to neutrino data) will put severe constraint on the possible structure of the Majorana mass matrix. The implication of the above mentioned correlations for neutrinoless double β-decay are also discussed, for both normal and inverted orderings.

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Section: (32)mentioning

confidence: 82%

Two-zero Majorana textures in the light of the Planck results

2014

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“…Apart from being interesting in itself, several scalar triplets naturally occur in models for neutrino masses and lepton mixing based on the type II seesaw mechanism. In particular, it has been shown that in such a scenario a realization of viable neutrino mass matrices with two texture zeros [24][25][26][27][28][29], 1 using symmetry arguments [34], requires two or three scalar triplets [35]. In this paper, we take up the case of two coexisting triplets.…”

Section: Jhep02(2014)060mentioning

confidence: 99%

Doubly charged scalar decays in a type II seesaw scenario with two Higgs triplets

Chaudhuri

Grimus

Mukhopadhyaya

2014

J. High Energ. Phys.

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The type II seesaw mechanism for neutrino mass generation usually makes use of one complex scalar triplet. The collider signature of the doubly-charged scalar, the most striking feature of this scenario, consists mostly in decays into same-sign dileptons or same-sign W boson pairs. However, certain scenarios of neutrino mass generation, such as those imposing texture zeros by a symmetry mechanism, require at least two triplets in order to be consistent with the type II seesaw mechanism. We develop a model with two such complex triplets and show that, in such a case, mixing between the triplets can cause the heavier doubly-charged scalar mass eigenstate to decay into a singly-charged scalar and a W boson of the same sign. Considering a large number of benchmark points with different orders of magnitude of the ∆L = 2 Yukawa couplings, chosen in agreement with the observed neutrino mass and mixing pattern, we demonstrate that H ++ 1 → H + 2 W + can have more than 99% branching fraction in the cases where the vacuum expectation values of the triplets are small. It is also shown that the above decay allows one to differentiate a two-triplet case at the LHC, through the ratios of events in various multi-lepton channels.

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“…Larger the allowed range of θ 13 , larger will be the deviation of θ 23 from maximality. The neutrino mass matrices of class C were examined analytically in [10] where some of the results reported here for class C have been obtained.…”

Section: Class Cmentioning

confidence: 99%

“…The same texture for the right handed neutrino mass matrix in the see-saw mechanism might follow from universal flavor symmetry hidden in a more fundamental theory of mass generation. Thus, the texture zeros in different positions of the neutrino mass matrix, in particular and fermion mass matrices, in general could be consequence of an underlying symmetry [9,10]. Such universal textures of fermion mass matrices can, theoretically, be obtained in the context of GUTs based on SO(10) [11].…”

Section: Introductionmentioning

confidence: 95%

Phenomenology of two-texture zero neutrino mass matrices

et al. 2007

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The generic predictions of two-texture zero neutrino mass matrices in the flavor basis have been examined especially in relation to the degeneracies between mass matrices within a class and interesting constraints on the neutrino parameters have been obtained. It is shown that the knowledge of the octant of θ 23 , the sign of cos δ and neutrino mass hierarchy can be used to lift these degeneracies. IntroductionMass matrices provide important tools for the investigation of the underlying symmetries and the resulting dynamics. The first step in this direction is the reconstruction of the neutrino mass matrix in the flavor basis. However, the reconstruction results in a large variety of possible structures of mass matrices depending strongly on the mass scale, mass hierarchy and the Majorana phases. However, the relatively weak dependence on some oscillation parameters (θ 23 and δ) results in the degeneracy of possible neutrino mass matrices. The mass matrix for Majorana neutrinos contains nine physical parameters including the three mass eigenvalues, three mixing angles and the three CP-violating phases. The two squared-mass differences (∆m 2 12 and ∆m 2 13 ) and the two mixing angles (θ 12 and θ 23 ) have been measured in solar, atmospheric and reactor experiments. The third mixing angle θ 13 and the Dirac-type CP-violating phase δ are expected to be measured in the forthcoming neutrino oscillation experiments. The possible measurement of the effective Majorana mass in neutrinoless double β decay searches will provide an additional constraint on the remaining three neutrino parameters viz. the neutrino mass scale and two Majorana-type CP-violating phases. While * dev5703@yahoo.com †

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On a model with two zeros in the neutrino mass matrix

Cited by 63 publications

References 30 publications

Two-zero Majorana textures in the light of the Planck results

Two-zero Majorana textures in the light of the Planck results

Doubly charged scalar decays in a type II seesaw scenario with two Higgs triplets

Phenomenology of two-texture zero neutrino mass matrices

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