Abstract
We study phenomenological constraints on the simple 3-3-1 model with flavor-violating Yukawa couplings. Both Higgs triplets couple to leptons and quarks, which generates flavor-violating signals in both lepton and quark sectors. We have shown that this model allows for a large Higgs lepton flavor-violating rate decay h rightarrow mu tau and also may reach perfect agreement with other experimental constraints such as tau rightarrow mu gamma and (g-2)_mu . The contributions of flavor-changing neutral current couplings, Higgs–quark–quark couplings, mixing to the mesons are investigated. Br(h rightarrow q q^prime ) can be enhanced acknowledging the measurements of meson mixing. The branching ratio for t rightarrow q h can reach up to 10^{-3}, but it could be as low as 10^{-8}.
Highlights
In the physics beyond Standard Model (SM), different mechanisms can yield the non-standard interactions of the SM-like Higgs boson that predict the flavor-violating processes, which could get close to the sensitivities of future accelerators
The h is identified with the Higgs boson discovered at the Large Hadron Collider (LHC) and H and H ± are new neutral and singly charged Higgs bosons, respectively, Because of the conservation of Z2 symmetry, the inert multiplets do not couple to the fermions
We would like to note that the third family of quarks is transformed differently from the first two families under transformation; it causes the flavor-changing neutral current (FCNC) at the tree level
Summary
In the physics beyond SM, different mechanisms can yield the non-standard interactions of the SM-like Higgs boson that predict the flavor-violating processes, which could get close to the sensitivities of future accelerators. The simple 3-3-1 model consists of two Higgs triplets in the normal sector and the leptons and quarks couple to both Higgs triplets via general Yukawa matrices (including both normalizable-operators and non-renormalized operators). It allows for flavor-changing tree-level couplings of the physical Higgs bosons. The neutral Higgs bosons contribute to (g − 2)μ at the oneloop level, with both flavors violating vertices, while they contribute to the τ → μγ at one loop and two loops We hope that these contributions can be fitted to the (g − 2)μ discrepancy of the measured value and the SM predicted value and may reach the current bound on Br(τ → μγ ) of the experiment.
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