Speaker
Description
The most general CP-violating two-Higgs-doublet model (2HDM) in the Yukawa alignment limit can produce significant di-photon branching ratios for the neutral scalars of the model. In the Higgs basis, where the two scalar doublets are identified as $H_1$ and $H_2$, the lagrangian term $Z_7 H_1^\dagger H_2 H_2^\dagger H_2 + {\rm h.c.}$ enters the branching ratios to di-photon of the new physics (mostly) CP-even scalar $H$ and the (mostly) CP-odd scalar $A$. While the $\Re[Z_7]$ contributes to $H\to\gamma\gamma$, the $\Im[Z_7]$ affects $A\to\gamma\gamma$ and can also be correlated to CP violating observables, such as non nonzero electric dipole moments.
In this framework, we derive bounds on electroweak scale scalars, using the recently observed statistically significant excesses at $95\,\text{GeV}$ and $152\,\text{GeV}$ as indicative benchmarks. In particular, the $152\,\text{GeV}$ scenario requires associated production of new physics scalars via Drell-Yan.
Based on: https://arxiv.org/abs/2412.00523
