大学院理学府物理学専攻 博士後期課程1年のRiasat Sheikhさんが「7th International Workshop on Higgs as a Probe of New Physics 2025 (HPNP2025)」においてBest Poster - Honorable Mentionを受賞しました。この賞は、大阪大学で開催された7th International Workshop on Higgs as a Probe of New Physics 2025 (HPNP2025)において、優秀なポスター発表を行った方に与えられます。
Riasat Sheikh (大学院理学府物理学専攻 博士後期課程1年)
Pseudo-Nambu-Goldstone-Boson Dark Matter with Three Complex Scalars
The existence of dark matter (DM) points to physics beyond the Standard Model, but its nature is unknown. While WIMPs have been leading candidates, null direct detection results motivate alternative scenarios. We propose a new DM model where pseudo-Nambu-Goldstone bosons (pNGBs) emerge from three SM-singlet complex scalars charged under dark $U(1)_V$ gauge groups and a $\mathbb{Z}_3$ symmetry. This symmetry allows semi-annihilation, potentially producing boosted DM (BDM). We analyze constraints and show that, although BDM flux is below current experimental reach, the model offers a minimal, viable framework for semi-annihilation-driven BDM.