English

A composite Froggatt-Nielsen model of flavor

High Energy Physics - Phenomenology 2022-06-29 v3

Abstract

A natural composite Higgs demands the presence of light resonances at the TeV scale, that in general are in conflict with bounds from flavor and CP violation. We propose a composite model with a Froggatt-Nielsen mechanism, that offers new possibilities for the origin of flavor. We analyse the interplay of partial compositeness and the horizontal U(1) symmetry in achieving the quark masses and mixing angles. We study the contributions to ΔF=2\Delta F=2 4-fermion operators, as well as to ΔF=1\Delta F=1 and neutron dipole operators. We find scenarios in which the contribution to Left-Right and Right-handed operators involving the first and second generations can be suppressed, in particular for a region of parameter space it is possible to simultaneously suppress the mixed-chirality contribution to K0Kˉ0K^0-\bar K^0 mixing by one power of the Cabibbo angle, λC\lambda_C, and the dipole moments by λC2\lambda_C^2 compared with anarchic partial compositeness, possibly making the resonances accessible at LHC. 4-fermion operators of BsB_s-meson mixing and Left-handed operators are not suppressed.

Keywords

Cite

@article{arxiv.2112.14600,
  title  = {A composite Froggatt-Nielsen model of flavor},
  author = {Leandro Da Rold and Federico Lamagna},
  journal= {arXiv preprint arXiv:2112.14600},
  year   = {2022}
}

Comments

23 pages, 5 figures. All comments welcome. Updated references and improved resolution of figures, and improved naming of sections. Definitions of some operator bases added for clarity. Added a short discussion on mixing between FN field and Higgs. Main results unchanged