Flavor violating Higgs signals, such as the top FCNC decay t → ch 0 and the LFV Higgs decay h 0 → τ µ, have been studied at the LHC. These signals can arise within the general Two-Higgs doublet model (THDM), where each Higgs doublet couples to all fermions types through Yukawa matrices Y f 1 and Y f 2 . The Yukawa matrices can be assumed to have the same form or they could have different structures. In this paper we study the case when both Y f 1 and Y f 2 have completely different forms, but in such a way that they complement to produce a specific hermitian mass matrix. We find that for specific four-zero textures, the Flavor Violating Higgs couplings depend only on the free parameters tan β, γ f and the fermion masses. We use the current bounds on the low energy processes, to derive constraints on the Heavy Higgs boson mass, tan β and γ f . Then, we use these constraints to evaluate the LFV Higgs decays, which reach Branching ratios that could be tested at the LHC.
The general two-Higgs doublet model (2HDM) contains a rich spectrum of neutral and charged Higgs bosons, whose detection would be a clear signal of new physics. When the Higgs potential is CP conserving, the spectrum includes a pseudoscalar mass eigenstate A 0 , which does not couple to vector bosons at tree level. However, fermionic loops (top and bottom mainly) induce the coupling AVV 0 (with V; V 0 ¼ γ; Z) at higher orders. We evaluate the amplitude for the decays A 0 → ZZ; Zγ; γγ, including a generic fermionic loop contribution, and present results on the branching ratios for 2HDM-I,II and III. Current LHC searches on heavy Higgs bosons are used as an estimate to constrain the allowed mass range for A 0 .
Models with extra gauge bosons often require an extended Higgs sector, which contains a rich spectrum of Higgs bosons with properties that deviate from the Standard Model (SM). Such Higgs bosons could be searched using standard mechanisms similar to the SM. However, the existence of the new gauge bosons could provide new production mechanisms, which could probe the non-standard origin of the Higgs particle. In this paper we study how the Z from a model with extra U (1) could be used as a source of Higgs bosons. We study 3-bodies decays of the Z into a Higgs boson and a top anti-top pair or WW pair, namely Z → tth, W W h. We find that it is possible to get Br s as high as 10 −2 for these modes, which could be studied at future colliders. We also study the production of the Higgs bosons in association with the Z vector boson at a linear collider, through the reaction e + e − → Z, Z → Z + h, including both the resonant and the non-resonant effects.
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