A composite Froggatt-Nielsen model of flavor

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 $\Delta F=2$ 4-fermion operators, as well as to $\Delta F=1$ 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 $K^0-{\bar{K}}^0$ mixing by one power of the Cabibbo angle, ${\lambda }_C$, and the dipole moments by ${\lambda }_C^2$ compared with anarchic partial compositeness, possibly making the resonances accessible at LHC. 4-fermion operators of $B_s$-meson mixing and Left-handed operators are not suppressed.

arXiv comment23 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

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