Parity problem of the scotogenic neutrino model

Merle, Alexander; Platscher, Moritz

doi:10.1103/physrevd.92.095002

Cited by 50 publications

(54 citation statements)

References 87 publications

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“…This could distract the reader from the actual messages we would like to bring across. However, we would like to point out that of course the running of the scalar potential may introduce all kinds of additional difficulties when trying to find a realistic choice of parameters (the parity problem [71] of the scotogenic model being just one example).…”

Section: Jhep11(2015)148mentioning

confidence: 99%

“…Therefore, choosing a small m η at M GUT will result in an m η comparable to the M 1,2,3 at the electroweak scale -and the approximation breaks down. A way out would be to choose m 2 η < 0 at the high scale, but this may result in breaking the Z 2 symmetry at high scales and hence the expression for the mass matrix being meaningless [71]. …”

Section: Dominant Rh Neutrino Massesmentioning

confidence: 99%

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Running of radiative neutrino masses: the scotogenic model — revisited

Merle

Platscher

2015

J. High Energ. Phys.

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A few years ago, it had been shown that effects stemming from renormalisation group running can be quite large in the scotogenic model, where neutrinos obtain their mass only via a 1-loop diagram (or, more generally, in many models in which the light neutrino mass is generated via quantum corrections at loop-level). We present a new computation of the renormalisation group equations (RGEs) for the scotogenic model, thereby updating previous results. We discuss the matching in detail, in particular in what regards the different mass spectra possible for the new particles involved. We furthermore develop approximate analytical solutions to the RGEs for an extensive list of illustrative cases, covering all general tendencies that can appear in the model. Comparing them with fully numerical solutions, we give a comprehensive discussion of the running in the scotogenic model. Our approach is mainly top-down, but we also discuss an attempt to get information on the values of the fundamental parameters when inputting the low-energy measured quantities in a bottom-up manner. This work serves the basis for a full parameter scan of the model, thereby relating its low-and high-energy phenomenology, to fully exploit the available information.

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Section: Jhep11(2015)148mentioning

confidence: 99%

Section: Dominant Rh Neutrino Massesmentioning

confidence: 99%

Running of radiative neutrino masses: the scotogenic model — revisited

Merle

Platscher

2015

J. High Energ. Phys.

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“…Here the trace runs over the SU (2) indices, the mass matrix M Σ (but not the NP Yukawa couplings Y ) is assumed to be flavor diagonal, D denotes the covariant derivative, 3 It is worth mentioning that the evolution of the model parameters via the renormalization group equations may induce a non-zero vacuum expectation value for φ 0 at high scales, leading to the spontaneous breaking of the Z2 symmetry. This situation, that indeed occurs in the minimal scotogenic model [30], may be naturally avoided extending the model with a Z2-even real scalar-triplet, as shown in [54] in the context of the scotogenic model where a fermion singlet is replaced by a fermion triplet [37]. This solution, where the evolution of the couplings of the scalar sector is modified by the extention of the scalar sector, is fully applicable to our case.…”

Section: Lagrangianmentioning

confidence: 79%

“…In this way, the so-called scotogenic model constitutes a solid framework to explain simultaneously DM and radiative neutrino masses. The minimal scotogenic model with singlet fermions is not the only possibility to explain both radiative neutrino masses and the correct DM relic density [25][26][27][28][29][30][31][32][33]. The realization of the Weinberg operator at one-loop involves the generic coupling of the lepton doublets with both Z 2 -odd scalar and fermion multiplets [34].…”

Section: Introductionmentioning

confidence: 99%

Radiative type III seesaw model and its collider phenomenology

et al. 2016

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We analyze the present bounds of a scotogenic model, the Radiative Type III Seesaw (RSIII), in which an additional scalar doublet and at least two fermion triplets of SU (2) L are added to the Standard Model (SM). In the RSIII the new physics (NP) sector is odd under an exact global Z 2 symmetry. This symmetry guaranties that the lightest NP neutral particle is stable, providing a natural dark matter (DM) candidate, and leads to naturally suppressed neutrino masses generated by a one-loop realization of an effective Weinberg operator. We focus on the region with the highest sensitivity in present and future LHC searches, with light scalar DM and at least one NP fermion triplet at the sub-TeV scale. This region allows for significant production cross-sections of NP fermion pairs at the LHC. We reinterpret a set of searches for supersymmetric particles at the LHC obtained using the package CheckMATE, to set limits on our model as a function of the masses of the NP particles and their Yukawa interactions. The most sensitive search channel is found to be dileptons plus missing transverse energy. In order to target the case of tau enhanced decays and the case of compressed spectra we reinterpret the recent slepton and chargino search bounds by ATLAS. For a lightest NP fermion triplet with a maximal branching ratio to either electrons or muons we exclude NP fermion masses of up to 650 GeV, while this bound is reduced to approximately 400 GeV in the tau-philic case. Allowing for a general flavor structure we set limits on the Yukawa couplings, which are directly related to the neutrino flavor structure.

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“…It should be noted, taking into account of the recent work [27], that the model of oneloop radiative neutrino mass with dark matter originally proposed by Ma and popularly known as "scotogenic" model [13] suffers from a hierarchy type problem which can spoil the phenomenological success of this model. The problem occurs due to the contributions from heavy Majorana neutrinos through renormalisation group evolution (RGE) to the mass parameters of the scalar fields which are odd under the unbroken Z 2 symmetry of the model.…”

Section: Singlet Fermion Dark Mattermentioning

confidence: 99%

Common origin of the 3.55 keV x-ray line and the Galactic Center gamma-ray excess in a radiative neutrino mass model

2015

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We attempt to simultaneously explain the recently observed 3.55 keV X-ray line in the analysis of XMM-Newton telescope data and the galactic center gamma ray excess observed by the Fermi gamma ray space telescope within an abelian gauge extension of standard model. We consider a two component dark matter scenario with tree level mass difference 3.55 keV such that the heavier one can decay into the lighter one and a photon with energy 3.55 keV. The lighter dark matter candidate is protected from decaying into the standard model particles by a remnant Z 2 symmetry into which the abelian gauge symmetry gets spontaneously broken. If the mass of the dark matter particle is chosen to be within 31 − 40 GeV, then this model can also explain the galactic center gamma ray excess if the dark matter annihilation into bb pairs has a cross section of σv (1.4 − 2.0) × 10 −26 cm 3 /s. We constrain the model from the requirement of producing correct dark matter relic density, 3.55 keV X-ray line flux and galactic center gamma ray excess. We also impose the bounds coming from dark matter direct detection experiments as well as collider limits on additional gauge boson mass and gauge coupling. We also briefly discuss how this model can give rise to sub-eV neutrino masses at tree level as well as one-loop level while keeping the dark matter mass at few tens of GeV. We also constrain the model parameters from the requirement of keeping the one-loop mass difference between two dark matter particles below a keV. We find that the constraints from light neutrino mass and keV mass splitting between two dark matter components show more preference for opposite CP eigenvalues of the two fermion singlet dark matter candidates in the model

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Parity problem of the scotogenic neutrino model

Cited by 50 publications

References 87 publications

Running of radiative neutrino masses: the scotogenic model — revisited

Running of radiative neutrino masses: the scotogenic model — revisited

Radiative type III seesaw model and its collider phenomenology

Common origin of the 3.55 keV x-ray line and the Galactic Center gamma-ray excess in a radiative neutrino mass model

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