Higgs decays displaced from the primary interaction vertex represent a striking experimental signature that is actively searched for by ATLAS, CMS and LHCb collaborations. We point out signals of this type appear in context 2HDM+$a$ model if mixing angle $\theta$ two CP-odd weak spin-0 eigenstates tiny dark matter (DM) sector either decoupled or kinematically inaccessible. Utilising suitable be...

We study the discovery potential of non-Standard Model (SM) heavy Higgs bosons in Two-Higgs-Doublet Models (2HDMs) at a multi-TeV muon collider and explore discrimination power among different types 2HDMs. find that pair production non-SM via universal gauge interactions is dominant mechanism once above kinematic threshold. Single boson associated with fermions could be important parameter regi...

RGEs for coefficients of dim-5 operators giving rise to neutrino masses in the seesaw mechanism are written down in the SM, 2HDM and MSSM, and solved numerically. RG evolution of these coefficients modifies tree-level seesaw predictions for neutrino masses and mixing angles in SO(10)-type GUT models as strongly as quark Yukawa coupling evolution. ZU-TH 20/93 DFPD 93/TH/44 ∗ Supported in part by...

The semileptonic decays τ− → μ−M(M = π, η, η′) could be sensitive probe for new physics scenarios with lepton flavor violation(LFV). Motivated by the recent Belle measurement, we investigate these decays in type III two-Higgs-doublet model (2HDM III), R-parity violating supersymmetric models(RPV SUSY) and flavor changing Z′ model, which have LFV couplings at tree level. Our results have shown t...

We perform comparative studies for four types of the two Higgs Doublet Models (2HDMs) under precision measurements Standard Model (SM) observables at proposed factories. explore discovery potential based on hypothetical deviations in data 2HDMs up to one-loop level. find $5\sigma$ observability from $\chi^2$ fitting a significant theory parameter space future For Type-I 2HDM, regions with $\cos...

The ratio of the vacuum expectation value of the two Higgs doublets, tanβ, is an important parameter of the general 2-HiggsDoublet Model (2HDM) and the Minimal Supersymmetric extension of the Standard Model (MSSM). The expected uncertainty on the determination of tanβ at a Linear Collider (LC) of at least 500 GeV center-of-mass energy and high luminosity is reviewed based on studies of neutral ...