Search for dark sector mediator

1月 7, 2024

Dark matter has been an enduring mystery for decades. For now, people tends to be interested in dark sectors that talk with Standard Model particles only via a “portal”. This portal is usually a mediator that can interact both with dark sector particles and the SM particles.

Such a kind of mediators have rich implications on cosmology and experiments, and has been intensitvely studied in the past years. On the one hand, various experiments have been proposed, designed, and run. On the other hand, various cosmological imprints can be left from the evolution of dark matter and dark mediator in the early universe.

I work on both side of the “mediator”. You can see my publications below.

Dark Matter Dark Mediator Dark Sector Cosmology Experiments

王若泉

博士后研究员

博士后研究员，粒子物理与宇宙学理论。音乐和体育爱好者。Neo-liberalism.

出版物

Discovering Dark Matter with the MUonE Experiment

We show that MUonE can also discover thermal relic dark matter using only its nominal experimental setup. Furthermore, our results show that the downstream ECAL plays a key role in rejecting backgrounds for this search, thereby providing strong motivation for the MUonE to keep this component in the final experimental design.

Gordan Krnjaic, Duncan Rocha, 王若泉

Discovering Dark Matter with the MUonE Experiment

Imprints of light dark matter on the evolution of cosmic neutrinos

We investigate the cosmological imprints of neutrino-DM-mediator interaction in a model-independent way, including the extra contribution of $N_{\rm eff}$ and the distortion of C$\nu$B. Lyman-$\alpha$ constraint is also discussed. To do this, we implemented a universal approach to solve the time evolution of dark matter in both freeze-in and freeze-out case.

王若泉, 许勋杰

Imprints of light dark matter on the evolution of cosmic neutrinos

Dark photons and displaced vertices at the MUonE experiment

We demonstrate how to search for dark photons by displaced vertex search at the proposed MUonE experiment in the mass range $10~\mathrm{MeV} \le m_{A’} \le 100~\mathrm{MeV}$ and kinetic mixing parameter $10^{-5} \le \epsilon e \le 10^{-3}$, through the process $\mu^{\pm}, e^- \to \mu^{\pm}, e^-, A’$ followed by $A’\to e^+e^-$.

Iftah Galon, David Shih, 王若泉

Dark photons and displaced vertices at the MUonE experiment