Speaker
Description
In this work, we categorize and discuss the maximum contributions to the muon magnetic moment $a_{\mu}$ as well as to the Yukawa and triple Higgs couplings in the flavour-aligned two-Higgs doublet model (2HDM). We focus on the most promising case of a light pseudoscalar Higgs A with large Yukawa couplings to leptons and quarks. By taking into account experimental constraints from LHC, Higgs and flavour physics, we find maximum possible Yukawa couplings of a light A of around $50\cdots 100$ (leptons) and $O(0.5)$ (quarks). An overall maximum for $a_{\mu}$ of more than $45\times 10^{−10}$ is possible in a very small parameter region around $M_{A} = 20 \,GeV$. For $M_{A}$ up to $100\, GeV$, the maximum possible value of $a_{\mu}$ is compatible with the currently observed deviation if the A couplings to quarks and leptons are both large, making this scenario promising for LHC searches. We also analyse the subleading bosonic two-loop contributions to $a_{\mu}$ , finding values up to $3\times 10^{−10}$.
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| arXiv | 1711.11567 |
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