E. Yu. Fedotova | Searcharxiv

arXiv2026

Active-sterile neutrino mixing in the ISS(p,q) inverse seesaw models

A class of models with inverse seesaw (ISS) mechanism is considered for arbitrary numbers p and q of new neutral fermions for each generation of leptons. The models containing a candidate particle for the role of warm dark matter are sorted using the inversion technique of an arbitrary block matrix in terms of Schur complement. Studies of the neutrino mass hierarchies and active-sterile neutrino mixing scenarios in the ISS parameter space for the general case of Casas-Ibarra diagonalization make it possible to identify a class of models that satisfy the last strong constraints from NuSTAR, XMM-Newton, and eROSITA experiments for keV-scale sterile neutrino dark matter particles.

hep-ph↗

arXiv2025

Higgs alignment limits in the type-II 2HDM and the MSSM with explicit CP-violation

For the general two-Higgs doublet model with Yukawa sector of type II (type II 2HDM), the Higgs alignment limit conditions are obtained for the neutral Higgs bosons with indefinite CP-parity $h_1, h_2$ or $h_3$, based on the symbolic results relating the elements of the mixing matrix to the masses of the Higgs bosons and the mixing angles. The results are valid up to dimension-six operators in the decomposition of the effective Higgs potential. Within the framework of the obtained Higgs alignment conditions, the possibility of the existence of light scalars is discussed. Within the Minimal Supersymmetric Standard Model (MSSM) framework, four benchmark scenarios are proposed. It is shown that two of them predict phenomenologically distinguishable CP-violating interactions of the Higgs boson $h_3$ with up-fermions.

hep-ph↗