21st Patras Workshop on Axions, WIMPs and WISPs

DOSUE-RR Experiment: The Direct Search for Dark Photon Dark Matter with the Broadband Millimeter-Wave Receiver FINER at $m_{\text{DP}}= 0.89–1.35$ meV

Not scheduled

20m

University of Western Australia

Student/ECR Presentation

Speaker

Shunki Endo (University of Tsukuba)

Description

The dark photon is one of the candidates for cold dark matter. It is theoretically motivated by specific models of string theory and inflation models, characterized by a very small mass in the range of$m_{\text{DP}} \approx \mu\text{eV} - \text{meV}$. It interacts with ordinary photons through a kinetic mixing parameter $\chi (\le 10^{-10})$. Driven by this interaction, the dark photon converts into photons with a specific frequency at the surface of a metal interface. Based on energy conservation ($m_{\text{DP}}c^2 = h\nu$ ), the frequency of the converted photon corresponds directly to the mass of the dark photon.

The DOSUE-RR (Dark photon dark matter Observing System for Un-Explored Radio-Range) experiment aims to detect these signals. In this study, we searched for the dark photon in the frequency range of 214–326 GHz, which corresponds to a mass range of 0.89–1.35 meV. The observation was performed over a period of 10 days using the wideband millimeter-wave receiver “FINER” to be installed on the Large Millimeter Telescope (LMT) in Mexico. In this presentation, we will report on the performance of the receiver used in the actual observation and the current status of the data analysis.