Programme

I.3 -- Invited, VCTP-49

Date: Tuesday, 30 July 2024

Time: 14:00 - 14:40

Linking the dark sector to the fermion mass hierarchy and the strong CP problem

D. T. Huong (1), A.E. C ́arcamo Hern ́andez (2,4), T. T. Hieu (3), Nicol ́as A. P ́erez-Julve (2,4), H. T. Hung (3)

(1) Institute of Physics, VAST, 10 Dao Tan, Ba Dinh, Hanoi, Vietnam (2) Departamento de Física, Universidad Tecnica Federico Santa Mar ́ıa, y Centro Cient Científico-Tecnol ́ogico de Valparaísóıso, Casilla 110-V, Valparaísóıso, Chile (3) Department of Physics, Hanoi Pedagogical University 2, Phuc Yen, Vinh Phuc 15000, Vietnam (4) Millennium Institute for Subatomic physics at energy frontier - SAPHIR, Fernandez Concha 700, Santiago, Chile

We studied an extended two-Higgs-doublet model (2HDM) with a low-scale seesaw mechanism for neutrino mass generation. We propose a viable two-component dark matter candidate and provide a natural explanation for the observed fermion mass hierarchy. Here, only the third family acquires mass at the tree level, while the first and second families acquire mass via loop corrections mediated by the dark sector. The complex Cabibbo-Kobayashi-Maskawa (CKM) matrix arises at the one-loop level, and the strong CP phase, which is naturally suppressed, arises at the three-loop level. The decay channels that violate the lepton number and anomalous magnetic moments of muons are also studied.

Presenter: Do Thi Huong