Two-Loop Contributions of the Order $\mathcal{O}(\alpha_t\alpha_s)$ to   the Masses of the Higgs Bosons in the CP-Violating NMSSM
  We provide the two-loop corrections to the Higgs boson masses of the CP-violating NMSSM in the Feynman diagrammatic approach with vanishing external momentum at ${\cal O} (\alpha_t \alpha_s)$. The adopted renormalization scheme is a mixture between $\overline{\text{DR}}$ and on-shell conditions. Additionally, the renormalization of the top/stop sector is provided both for the $\overline{\text{DR}}$ and the on-shell scheme. The calculation is performed in the gaugeless limit. We find that the two-loop corrections compared to the one-loop corrections are of the order of 5-10\%, depending on the top/stop renormalization scheme. The theoretical error on the Higgs boson masses is reduced due to the inclusion of these higher order corrections. 
Margarete Muhlleitner, Dao Thi Nhung, Heidi Rzehak, Kathrin Walz
hep-ph