Abstract
Abstract Minimal Flavor Violation in the up-type quark sector leads to particularly interesting phenomenology due to the interplay of flavor physics in the charm sector and collider physics from flavor changing processes in the top sector. We study the most general operators that can affect top quark properties and D meson decays in this scenario, concentrating on two CP violating operators for detailed studies. The consequences of these effective operators on charm and top flavor changing processes are generically small, but can be enhanced if there exists a light flavor mediator that is a Standard Model gauge singlet scalar and transforms under the flavor symmetry group. This flavor mediator can satisfy the current experimental bounds with a mass as low as tens of GeV and explain observed D-meson direct CP violation. Additionally, the model predicts a non-trivial branching fraction for a top quark decay that would mimic a dijet resonance.
Highlights
Minimal Flavor Violation in the up-type quark sector leads to interesting phenomenology due to the interplay of flavor physics in the charm sector and collider physics from flavor changing processes in the top sector
Rather than explore the symmetry breaking mechanism of the global flavor symmetry, we study the phenomenological consequences of the light φ field for ∆C = 1 and ∆T = 1 processes
We have studied a class of models below the scale of electroweak symmetry breaking that lead to interesting ∆C = 1 and ∆T = 1 observables while remaining unconstrained by other flavor and precision observables
Summary
The principle of MFV is implemented by treating the SM Yukawa matrices as spurions of flavor symmetry. The remainder of this paper concentrates on the two CP -violating operators, OV 2 and OS2, since these operators are the only ones with a different color structure compared to the SM that can contain a new CP violating phase under the assumption of MFV. They correspond to the electroweak-invariant operators: OVEW2 = 2 Vil (λ†DV †λU )kj (H QiL αujR α)(dkR βQlL βH†) , OSE2W αQjL α)(dkR β QlL β ). Where the SU(2)L indices are contracted in the parenthesis for the dimension 8 operator OVEW2 and between the two QL’s for the dimension 6 operator OSE2W
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