Beta and neutrinoless double beta decays with KeV sterile fermions

Abada, Asmâa; Hernández-Cabezudo, Álvaro; Marcano, Xabier

doi:10.1007/jhep01(2019)041

Cited by 42 publications

(27 citation statements)

References 179 publications

(207 reference statements)

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“…Addition of extra fermions may contribute to the effective electron neutrino Majorana mass [96] We have evaluated the contribution to (m ee ) using the equation in [78,97]…”

Section: Numerical Analaysis and Resultsmentioning

confidence: 99%

Phenomenology of keV scale sterile neutrino dark matter with S4 flavor symmetry

Gautam

Das

2020

J. High Energ. Phys.

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We study the possibility of simultaneously addressing neutrino phenomenology and the dark matter in the framework of inverse seesaw. The model is the extension of the standard model by the addition of two right handed neutrinos and three sterile fermions which leads to a light sterile state with the mass in the keV range along with three light active neutrino states. The lightest sterile neutrino can account for a feasible dark matter(DM) candidate. We present a S 4 flavor symmetric model which is further augmented by Z 4 × Z 3 symmetry to constrain the Yukawa Lagrangian. The structures of the mass matrices involved in inverse seesaw within the S 4 framework naturally give rise to correct neutrino mass matrix with non-zero reactor mixing angle θ 13 . In this framework, we conduct a detailed numerical analysis both for normal hierarchy as well as inverted hierarchy to obtain dark matter mass and DM-active mixing which are the key factors for considering sterile neutrino as a viable dark matter candidate. We constrain the parameter space of the model from the latest cosmological bounds on the mass of the dark matter and DM-active mixing.

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“…Addition of extra fermions may contribute to the effective electron neutrino Majorana mass [96] We have evaluated the contribution to (m ee ) using the equation in [78,97]…”

Section: Numerical Analaysis and Resultsmentioning

confidence: 99%

Phenomenology of keV scale sterile neutrino dark matter with S4 flavor symmetry

Gautam

Das

2020

J. High Energ. Phys.

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“…To accommodate an eV scale sterile-like neutrino N 1 , with lepton number violating (LNV) Majorana mass manifest the new physics contribution beyond SM [85][86][87][88]. The well known process of NDBD includes the simultaneous decay of two neutrons from the nucleus of an isotope (A, Z ) into two protons and two electrons without the emission of any neutrinos in the final state [89][90][91][92][93],…”

Section: Discussion On Neutrinoless Double Beta Decay With Ev-scale Nmentioning

confidence: 99%

Neutrino phenomenology and dark matter in an $$A_4$$ flavour extended $$B-L$$ model

et al. 2020

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We present an A 4 flavor extended B − L model for realization of eV scale sterile neutrinos, motivated by the recent experimental hints from both particle physics and cosmology. The framework considered here is a gauged B − L extension of standard model without the introduction of righthanded neutrinos, where the gauge triangle anomalies are canceled with the inclusion of three exotic neutral fermions N i (i = 1, 2, 3) with B − L charges − 4, − 4 and 5. The usual Dirac Yukawa couplings between the SM neutrinos and the exotic fermions are absent and thus, the model allows natural realization of eV scale sterile-like neutrino and its mixing with standard model neutrinos by invoking A 4 flavor symmetry. We demonstrate how the exact tri-bimaximal mixing pattern is perturbed due to active-sterile mixing by analyzing 1 + 3 case in detail. We also show the implication of eV scale sterile-like neutrino on various observables in neutrino oscillation experiments and the effective mass in neutrinoless double beta decay. Another interesting feature of the model is that one of three exotic fermions is required to explain eV scale phenomena, while other two fermions form stable dark matter candidates and their total relic density satisfy the observed 3σ limit of Planck data. We constrain the gauge parameters associated with U (1) gauge extension, using relic density and collider bounds.

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“…In this section we will first review the treatment of 0νββ decay in the presence of sterile neutrinos, having previously been covered in detail in the literature in the context of the type-I seesaw [21,179], inverse and extended seesaws [180,181] and left-right symmetric models [182][183][184][185][186][187][188][189][190].…”

Section: Neutrinoless Double Beta Decaymentioning

confidence: 99%

Neutrinoless double beta decay versus other probes of heavy sterile neutrinos

Bolton

Deppisch

Dev³

2020

J. High Energ. Phys.

173

138

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We make a comparative study of the neutrinoless double beta decay constraints on heavy sterile neutrinos versus other direct and indirect constraints from both lepton number conserving and violating processes, as a sensitive probe of the extent of lepton number violation and possible interference effects in the sterile sector. To this effect, we introduce a phenomenological parametrisation of the simplified one-generation seesaw model with one active and two sterile neutrino states in terms of experimentally measurable quantities, such as active-sterile neutrino mixing angles, CP phases, masses and mass splittings. This simple parametrisation enables us to analytically derive a spectrum of possible scenarios between the canonical seesaw with purely Majorana heavy neutrinos and inverse seesaw with pseudo-Dirac ones. We then go on to constrain the simplified parameters of this model from various experiments in energy, intensity and cosmic frontiers. We emphasise that the constraints from lepton number violating processes strongly depend on the mass splitting between the two sterile states and the relative CP phase between them. This is particularly relevant for the neutrinoless double beta decay constraint, which could now get significantly weaker for small mass splitting and opposite CP parities between the sterile states. It is important to keep this in mind while comparing the neutrinoless double beta decay constraint with the direct search limits in the electron flavour from high-energy colliders.

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Beta and neutrinoless double beta decays with KeV sterile fermions

Cited by 42 publications

References 179 publications

Phenomenology of keV scale sterile neutrino dark matter with S4 flavor symmetry

Phenomenology of keV scale sterile neutrino dark matter with S4 flavor symmetry

Neutrino phenomenology and dark matter in an $$A_4$$ flavour extended $$B-L$$ model

Neutrinoless double beta decay versus other probes of heavy sterile neutrinos

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