Radiative corrections to the Yukawa coupling constants in two Higgs doublet models

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We calculate one-loop corrected Yukawa coupling constants hff- for the standard model-like Higgs boson h in two Higgs doublet models. We focus on the models with the softly-broken Z2 symmetry, which is imposed to avoid the flavor changing neutral current. Under the Z2 symmetry, there are four types of Yukawa interactions. We find that one-loop contributions from extra Higgs bosons modify the hff- couplings to be maximally about 5% under the constraint from perturbative unitarity and vacuum stability. Our results show that the pattern of tree-level deviations by the mixing effect in each type of Yukawa couplings from the SM predictions does not change even including radiative corrections. Moreover, when the gauge couplings hVV (V = W, Z) are found to be slightly (with a percent level) different from the SM predictions, the hff- couplings also deviate but more largely. Therefore, in such a case, not only can we determine the type of Yukawa couplings but also we can obtain information on the extra Higgs bosons by comparing the predictions with precisely measured hff- and hVV couplings at future electron-positron colliders. © 2014 Elsevier B.V.




Kanemura, S., Kikuchi, M., & Yagyu, K. (2014). Radiative corrections to the Yukawa coupling constants in two Higgs doublet models. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 731, 27–35. https://doi.org/10.1016/j.physletb.2014.02.022

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