Unveiling time-varying signals of ultralight bosonic dark matter at collider and beam dump experiments.

The ultralight boson represents a promising dark matter candidate exhibiting unique wave-like behaviors. These properties could transfer to the dark mediator, such as the kinetic mixing dark photon, which can be a link between the dark and Standard Model sectors, resulting in periodic oscillations of its mass. We propose a method to detect ultralight dark matter using dark mediators in collider and beam dump experiments, distinguishing it from conventional atomic, molecular, and optical methods. The time-varying nature of dark mediator mass exhibits a double-peak spectrum, reducing traditional constraints by 1 to 2 orders of magnitude, due to decreased luminosity exposure in each resonant mass bin. To enhance sensitivity, we utilize event time-stamps in the CMS Open Data and demonstrate that this technique boosts sensitivity by approximately one order of magnitude compared to the time-blind method. Moreover, it proves effective in detecting the invisible decay of the dark mediator. The authors present an approach for detecting ultralight bosonic dark matter using collider and beam dump experiments. The method relies on the time-varying mass of dark sector mediators, which serve as a portal between the dark and Standard Model sector. CMS Open Data are used to demonstrate that this method enhances sensitivity by around one order of magnitude compared to the double-peak method. [ABSTRACT FROM AUTHOR]