Impact of a four-zero Yukawa texture on h → γγ and γZ in the framework of the Two Higgs Doublet Model Type III

Abstract

We study the substantial enhancement, with respect to the corresponding Standard Model rates, that can be obtained for the branching ratios of the decay channels h → γγ and h → γZ within the framework of the Two Higgs Doublet Model Type III, assuming a four-zero Yukawa texture and a general Higgs potential. We show that these processes are very sensitive to the flavor pattern entering the Yukawa texture and to the triple coupling structure of the Higgs potential, both of which impact onto the aforementioned decays. We can accommodate the parameters of the model in such a way to obtain the h → γγ rates reported by the Large Hadron Collider and at the same time we get a h → γZ fraction much larger than in the Standard Model, indeed within experimental reach. We present some scenarios where this phenomenology is realized for spectrum configurations that are consistent with current constraints. We also discuss the possibility of obtaining a light charged Higgs boson compatible with all such measurements, thereby serving the purpose of providing a hallmark signal of the scenario considered.

Probing the Standard Model with Higgs signal rates from the Tevatron, the LHC and a future ILC

“…For instance, charged supersymmetric particles such as light staus [34,42,[154][155][156][157] and charginos [158,159] could give potentially substantial contributions. In 2HDMs the Higgs-photon coupling can be altered due to contributions from the charged Higgs boson [160][161][162], and in the special case of the Inert Doublet Model [163][164][165][166], modifications of κ γ and κ Zγ are indeed the only possible change to the Higgs coupling structure. In addition, many of these models can also feature invisible or undetectable Higgs decays.…”

Sensitivity of the decayh→ZZ*→Zl+l−to the Higgs self-coupling through radiative corrections

“…Similarly, we will use the full Higgs potential Eq. (20) because the λ 6 and λ 7 parameters will induce important corrections to the self scalar couplings [24,25]. This model is called 2HDM-III, it includes two neutral scalar fields, h and H, and h is the lightest Higgs boson associated to the SM.…”

“…[24,25]. The gauge boson vector couplings were used in the unitary gauge and the respective Yukawa couplings are determined by the four zeros texture version of 2HDM [27].…”

Flavor violating signatures of lighter and heavier Higgs bosons within Two Higgs Doublet Model type III at the LHeC

“…Since a specific four-zero texture is implemented as a flavor symmetry in the Yukawa sector, this is the mechanism which controls FCNCs so that discrete symmetries in the Higgs potential are not needed [8][9][10][11][12]. Then the most general SU (2) L × U (1) Y invariant scalar potential, following [7], can be written where φ f ij (φ = h, H, A), Xij , Yij and Zij are defined as follows:…”

“…[8][9][10][11][12][13][14][15]. However, plentiful of studies, also including lepton flavor violating scenarios, exist, some specific to 2HDMs and others adaptable to their case: see for an incomplete list, e.g., Refs.…”