We consider the small excesses around 95 GeV found in several searches for a new scalar $\ensuremath{\gamma}\ensuremath{\gamma}$, $\ensuremath{\tau}\ensuremath{\tau}$, and $b\overline{b}$ final states. Instead of trying to accommodate them all, as is usually done literature, context given Standard Model (SM) extension, we investigate whether it would be possible that one or two these correspond an actual scalar, while remaining ones are merely statistical fluctuations. To this end, use...

We propose a KSVZ-type axion framework in which vector-like quarks (VLQ) and colored scalars generate Dirac neutrino masses radiatively. The global Peccei-Quinn symmetry (under the exotic fermions are charged) addresses strong CP problem ensures nature of neutrinos. also accounts for observed cosmological dark matter. systematically explore all viable VLQ representations. Depending on specific scenario, predicts distinct axion-to-photon couplings, testable through haloscope helioscope...

The neutrino mass and dark matter (DM) problems are addressed in a Standard Model extension where the type-II seesaw scotogenic mechanisms coexist. model features flavour $\mathcal{Z}_8$ discrete symmetry which is broken down to $\mathcal{Z}_2$, stabilising (scalar or fermion) DM particle. Spontaneous CP violation implemented through complex vacuum expectation value of singlet scalar field, inducing observable CP-violating effects lepton sector. structure effective matrix leads constraints...

We propose a minimal model where dark sector, odd under Z2 discrete symmetry, is the seed of lepton number violation in neutrino sector at loop level, context linear seesaw mechanism. Neutrino mass suppression stems from naturally small scalar potential coupling which breaks symmetry softly. The fact that we consider (dark) Dirac vector-like neutral leptons, prevents appearance other terms could contribute to masses via alternative mechanisms. study dark-matter phenomenology model, focusing...

In the vanilla type-I seesaw leptogenesis scenario, CP violation required to generate lepton asymmetries in heavy Majorana neutrino decays stem from complex Dirac-type Yukawa couplings. this paper we explore case which that originates vacuum expectation value of a scalar singlet at very high scale. This non-trivial CP-violating phase can be successfully communicated low-energy sector via portal. The new scalar-singlet degrees freedom contributions relevant for not only one-loop level but...

We propose a generalized Kim-Shifman-Vainshtein-Zakharov–type axion framework in which colored fermions and scalars act as two-loop Majorana neutrino-mass mediators. The global Peccei-Quinn symmetry under exotic are charged solves the strong <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:mi>C</a:mi><a:mi>P</a:mi></a:mrow></a:math> problem. Within our general proposal, various setups can be distinguished by probing axion-to-photon coupling at helioscopes...

A bstract We study the phenomenology of minimal (2 , 2) inverse-seesaw model supplemented with Abelian flavour symmetries. To ensure maximal predictability, we establish most restrictive patterns which can be realised by those This setup requires adding an extra scalar doublet and two complex singlets to Standard Model, paving way implement spontaneous CP violation. It is shown that such CP-violating effects successfully communicated lepton sector through couplings new sterile fermions. The...

We consider the small excesses around 95 GeV found in several searches for a new scalar $\gamma \gamma$, $\tau \tau$ and $b \bar b$ final states. Instead of trying to accommodate them all, as is usually done literature, context given Standard Model~(SM) extension, we investigate whether it would be possible that one or two these correspond an actual scalar, while remaining ones are merely statistical fluctuations. To this end, use benchmark model UN2HDM, SM extension with doublet, singlet,...

We propose a model based on the interplay between type-II seesaw and scotogenic neutrino mass generation mechanisms. The setup features $\mathbb{Z}_8$ discrete flavour symmetry which is broken down to residual $\mathbb{Z}_2$ responsible for stabilising dark matter. A singlet scalar field introduced implement spontaneous CP violation. effective matrix two-texture zero structure leads sharp sector predictions. analyse constraints imposed by current future charged lepton violation experiments....

In the context of 2HDM, and assuming that neutrinos acquire masses via Weinberg operator, we perform a systematic analysis to determine minimal quark lepton flavour patterns, compatible with masses, mixing CP violation data, realisable by Abelian symmetries. We four models for quarks, where number independent parameters matches observables. For sector, three predictive are identified. Namely, find scenarios preference upper/lower octant $\theta_{23}$ atmospheric angle, exhibit lower bounds...

In the context of 2HDM, and assuming that neutrinos acquire masses via Weinberg operator, we perform a systematic analysis to determine minimal quark lepton flavor patterns, compatible with masses, mixing <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mi>C</a:mi><a:mi>P</a:mi></a:math> violation data, realizable by Abelian symmetries. We four models for quarks, where number independent parameters matches observables. For sector, three predictive are identified....

We propose a novel realization of the Nelson-Barr mechanism ``seeded'' by dark sector containing scalars and vectorlike quarks. Charge parity ($CP$) ${\mathcal{Z}}_{8}$ symmetry are spontaneously broken complex vacuum expectation value singlet scalar, leaving residual ${\mathcal{Z}}_{2}$ that stabilizes matter (DM). A Cabibbo-Kobayashi-Maskawa matrix arises via one-loop corrections to quark mass mediated sector. In contrast with other proposals where nonzero contributions strong $CP$ phase...

We propose a model based on the interplay between type-II seesaw and scotogenic neutrino mass generation mechanisms. The setup features $\mathbb{Z}_8$ discrete flavour symmetry which is broken down to residual $\mathbb{Z}_2$ responsible for stabilising dark matter. A singlet scalar field introduced implement spontaneous CP violation. effective matrix two-texture zero structure leads sharp sector predictions. analyse constraints imposed by current future charged lepton violation experiments....

We propose a generalized Kim-Shifman-Vainshtein-Zakharov-type axion framework in which colored fermions and scalars act as two-loop Majorana neutrino-mass mediators. The global Peccei-Quinn symmetry under exotic are charged solves the strong CP problem. Within our general proposal, various setups can be distinguished by probing axion-to-photon coupling at helioscopes haloscopes. also comment on dark-matter production early Universe.

In the vanilla type-I seesaw leptogenesis scenario, CP violation required to generate lepton asymmetries in heavy Majorana neutrino decays stem from complex Dirac-type Yukawa couplings. this paper we explore case which that originates vacuum expectation value of a scalar singlet at very high scale. This non-trivial CP-violating phase can be successfully communicated low-energy sector via portal. The new scalar-singlet degrees freedom contributions relevant for not only one-loop level but...

We study the phenomenology of minimal inverse-seesaw model composed two "right-handed neutrinos" and sterile singlet fermions, besides Standard Model (SM) particle content.The is supplemented with Abelian flavour symmetries to ensure maximal predictability establish most restrictive patterns which can be realised by those symmetries.This setup requires addition a second scalar doublet complex singlets SM enabling us implement spontaneous CP violation.Such CP-violating effects successfully...