2017/11/30 by Ketan M. Patel · 1 citation
Physics and Astronomy · #hep-ph
paper · pdf · doi:10.1103/physrevd.96.115013
published as Phys. Rev. D 96, 115013 (2017) · 12 pages, 4 figures; Typos corrected, published version
arxiv created 2017/12/19 · arxiv updated 2017/12/20
We incorporate clockwork mechanism into the Standard Model flavour sector and show that the observed pattern of fermion masses and mixing can be obtained without any unnaturally small or large parameter in the fundamental theory. By introducing Nf pairs of vectorlike fermions, as clockwork gears, for each generation of the Standard Model fermions and setting up a characteristic clockwork potential, it is shown that the inter-generational mass hierarchies are determined by Nf. For a given type of fermions, strong or mild hierarchy in the masses and mixing parameters can be obtained by taking the large or small value of Nf. The mechanism is shown to lead to a generalized version of the Froggatt-Nielsen mechanism as an effective description.