Neutrino mixing with nonzero θ<sub>13</sub> in Zee–Babu model

Long, Hoang Ngoc; Vien, V. V.

doi:10.1142/s0217751x14500729

Cited by 24 publications

(8 citation statements)

References 31 publications

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“…Another motivation for this direction is that the continuous and/or discrete symmetries ensuring the loop origin could also guarantee the existence of a (or multiple) dark matter (DM) candidate(s). Following the landmarks [4][5][6][7][8], recently a variety of works on radiative seesaw model have been done [9]- [59], where we can also find studies emphasizing non-Abelian discrete symmetry [60][61][62][63][64][65][66][67], radiative generation of quark/charged lepton masses [68][69][70][71][72], operator analysis [73,74], radiative models accompanying conformal EW symmetry breaking [75][76][77], and others [78][79][80][81][82][83][84][85][86][87][88][89][90].…”

Section: Introductionmentioning

confidence: 99%

Three loop neutrino model with isolatedk±±

2015

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We propose a three loop radiative neutrino mass scenario with an isolated doubly charged singlet scalar k ±± without couplings to the charged leptons, while two other singly charged scalars h ± 1 and h ± 2 attach to them. In this setup, the lepton flavor violation originating from k ±± exchanges is suppressed and the model is less constrained, where some couplings can take sizable values.As reported in our previous work [1], the loop suppression factor at the three loop level would be too strong and realized neutrino masses in a three loop scenario could be smaller than the observed minuscule values. The sizable couplings can help us to enhance neutrino masses without drastically large scalar trilinear couplings appearing in a neutrino mass matrix, which tends to drive the vacuum stability to become jeopardized at the one loop level. Now the doubly charged scalar k ±± has less constraint via lepton flavor violation and the vacuum can be quite stable, and thus a few hundred GeV mass in k ±± is possible, which is within the LHC reach and this model can be tested in the near future. Note that the other h ± 1 and h ± 2 should be heavy at least around a few TeV. We suitably arrange the charges of an additional global U (1) symmetry, where the decay constant of the associated Nambu-Goldstone boson can be around a TeV scale consistently. Also, this model is indirectly limited through a global analysis on results of the LHC Higgs search and issues on a dark matter candidate, the lightest Majorana neutrino. After h ± 1 and h ± 2 are decoupled, this particle couples to the standard model particles only through two charge parity even scalars in theory and thus information on this scalar sector is important. Consistent solutions are found, but a part of them is now on the edge.

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Section: Introductionmentioning

confidence: 99%

Three loop neutrino model with isolatedk±±

2015

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“…In our case the direct detection of DM is dominated by Z ′ boson exchange diagram even though Z ′ is very heavy, M Z ′ = 10(20) TeV. We note that m h + = m k ++ = 1 TeV can easily evade the constraints from the lepton flavor violating processes with f ab , h ′ ab ∼ O(0.01), while still being able to explain neutrino masses (for example, see Herrero-Garcia, et al in [54][55][56][57][58]). Although there is no direct signature for our scenario, we need relatively light, electroweak scale, Zee-Babu scalars h + and k ++ , which can be searched for at LHC 14 TeV.…”

Section: Jhep08(2015)023mentioning

confidence: 77%

“…Here the Lepton number (or the B − L number) is broken spontaneously by the λ µ term, thus this term provides dynamical origin of soft lepton number breaking term in the original Zee-Babu model. We refer the reader to [45][46][47] for more details and to [54][55][56][57][58] for the recent analysis of Zee-Babu model. We just note that we do not have additional constraints from the flavor changing neutral processes in the quark sector or the charged lepton flavor violations because the Z ′ boson coupling to the SM fermions are flavor universal and also we take Z ′ mass to be very heavy (M Z ′ 10 TeV).…”

Section: The Modelmentioning

confidence: 99%

3.5 keV X-ray line signal from dark matter decay in local U(1)B−L extension of Zee-Babu model

Baek¹

2015

J. High Energ. Phys.

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We consider a local U(1) B−L extension of Zee-Babu model to explain the recently observed 3.5 keV X-ray line signal. The model has three Standard model (SM)-singlet Dirac fermions with different U(1) B−L charges. A complex scalar field charged under U(1) B−L is introduced to break the U(1) B−L symmetry. After U(1) B−L symmetry breaking a remnant discrete symmetry stabilizes the lightest state of the Dirac fermions, which can be a stable dark matter (DM). The second lightest state, if mass splitting with the stable DM is about 3.5 keV, decays dominantly to the stable DM and 3.5 keV photon through two-loop diagrams, explaining the X-ray line signal. Two-loop suppression of the decay amplitude makes its lifetime much longer than the age of the universe and it can be a decaying DM candidate in large parameter region. We also introduce a real scalar field which is singlet under both the SM and U(1) B−L and can explain the current relic abundance of the Dirac fermionic DMs. If the mixing with the SM Higgs boson is small, it does not contribute to DM direct detection. The main contribution to the scattering of DM off atomic nuclei comes from the exchange of U(1) B−L gauge boson, Z ′ , and is suppressed below current experimental bound when Z ′ mass is heavy ( 10 TeV). If the singlet scalar mass is about 0.1-10 MeV, DM self-interaction can be large enough to solve small scale structure problems in simulations with the cold DM, such as, the core-vs-cusp problem and too-big-to-fail problem.

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“…The numerical result for the three families does not change much from this case. 7 Recently sophisticated analysis has been done by refs. [46,47] decay channel in our case is given by R is obtained approximately to be 8…”

Section: A Neutrino Massesmentioning

confidence: 99%

A two loop radiative neutrino model

2019

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We explore the possibility to explain a bosonic dark matter candidate with a gauge singlet inside the loop to generate the neutrino mass matrix at two-loop level. The mass matrix is suppressed by a small mixing that comes from the bound on direct detection experiments of the dark matter, and equivalent of the three-loop neutrino model due to the small mixing between neutral inert bosons.Here, our setup is the Zee-Babu type scenario with Z 3 discrete symmetry, in which we consider the neutrino oscillation data, lepton flavor violations, muon g − 2, µ − e conversion rate, lepton flavor-changing and conserving Z boson decay and bosonic dark matter candidate.

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Neutrino mixing with nonzero θ₁₃ in Zee–Babu model

Cited by 24 publications

References 31 publications

Three loop neutrino model with isolatedk±±

Three loop neutrino model with isolatedk±±

3.5 keV X-ray line signal from dark matter decay in local U(1)B−L extension of Zee-Babu model

A two loop radiative neutrino model

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Neutrino mixing with nonzero θ13 in Zee–Babu model

Cited by 24 publications

References 31 publications

Three loop neutrino model with isolatedk±±

Three loop neutrino model with isolatedk±±

3.5 keV X-ray line signal from dark matter decay in local U(1)B−L extension of Zee-Babu model

A two loop radiative neutrino model

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Neutrino mixing with nonzero θ₁₃ in Zee–Babu model