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In the framework of the Standard Model Effective Field Theory, we compare thelower bounds on the scale of new physics possibly contributing to the$f\bar{f}h$ effective couplings, obtained from the measurements of differentobservables, under the assumption that the Wilson coefficients of the relevantdim 6 operators respect certain flavour structure: either the Minimal FlavourViolation (MFV) ansatz or a flavour symmetry, often invoked to explain theobserved pattern of fermion masses and mixings. We perform a global analysis ofthe bounds following from the limits on the diagonal couplings measured in theHiggs boson production and decays at the LHC experiments. Another set of boundsis obtained from the limits on non-diagonal couplings constrained by thevariety of flavour changing neutral current (FCNC) and radiative decayprocesses. With the present precision of the LHC data, the FCNC data givestronger bounds on the scale of new physics than the collider data (obviously,for the MFV ansatz only collider data are relevant): once the Wilsoncoefficients respect some flavour structure, the obtained bounds are in the TeVrange. In the quark case, these limits are compatible with a few percentdeviations from the SM Yukawa couplings and only mildly more stringent thanthose obtained from the available collider data. For leptons, instead, the FCNCbounds are stronger and then a signal in the near future collider data wouldmean the violation of the flavour symmetry or indicate the presence ofadditional beyond the Standard Model contributions, affecting the flavourobservables, that leads to cancellations.

Searching for BSM Physics in Yukawa Couplings and Flavour Symmetries