Research output per year
Research output per year
Joel Oredsson, Johan Rathsman
Research output: Contribution to journal › Article › peer-review
We investigate the effects of a ℤ _{2} symmetry in the CP-conserving Two-Higgs-Doublet-Model (2HDM); which is often imposed to prevent Flavor-Changing-Neutral-Currents (FCNCs) at tree-level. Specifically, we analyze how a breaking of the ℤ _{2} symmetry spreads during renormalization group evolution; employing general 2-loop renormalization group equations that we have derived. Evolving the model from the electroweak to the Planck scale, we find that while the case of an exact ℤ _{2} symmetric 2HDM is very constrained, a soft breaking of the ℤ _{2} symmetry extends the valid parameter space regions. The effects of a hard ℤ _{2} breaking in the scalar sector as well as the stability of the flavor alignment ansatz are also investigated. We find that while a hard breaking of the ℤ _{2} symmetry in the potential is problematic, since it speeds up the growth of quartic couplings, the generated FCNCs are heavily suppressed. Conversely, we also find that hard ℤ _{2} breaking in the Yukawa sector at most gives moderate ℤ _{2} breaking in the potential; whereas the FCNCs can become quite sizable far away from the ℤ _{2} symmetric regions.
Original language | English |
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Article number | 152 |
Journal | Journal of High Energy Physics |
Volume | 2019 |
Issue number | 2 |
DOIs | |
Publication status | Published - 2019 Feb 22 |
Research output: Thesis › Doctoral Thesis (compilation)