EUROPEAN PHYSICAL JOURNAL C 81, 813 (2021)

ISSN: 1434-6044, SCIE

Physical constraints derived from FCNC in the 3-3-1-1 model

Duy Nguyen Tuan, Takeo Inami, Huong Do Thi

We investigate several phenomena related to FCNCs in the 3-3-1-1 model. The sources of FCNCs at the tree-level from both the gauge and Higgs sectors are clarified. Experiments on the oscillation of mesons most stringently constrain the tree-level FCNCs. The lower bound on the new physics scale is imposed more tightly than in the previous, Mnew > 12 TeV. Under this bound, the treelevel FCNCs make a negligible contribution to the Br(Bs → μ^+ μ^−), Br(B → K∗ μ^+ μ^−) and Br(B^+ → K^+ μ^+ μ^−). The branching ratio of radiative decay b → sγ is enhanced by the ratio v/u via diagrams with the charged Higgs mediation. In contrast, the charged currents of new gauge bosons significantly contribute to the decay process μ → eγ.

DOI: 10.1140/epjc/s10052-021-09583-x

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