Speaker
Description
Dark photons have emerged as promising candidates for dark matter, and their search is a toppriority in particle physics, astrophysics, and cosmology. We report the first use of a tunable niobiumsuperconducting radio-frequency cavity for a scan search of dark photon dark matter with innovativedata analysis techniques. We mechanically adjusted the resonant frequency of a cavity submergedin liquid helium at a temperature of 2 K, and scanned the dark photon mass over a frequency rangeof 1.37 MHz centered at 1.3 GHz. Our study leveraged the superconducting radio-frequency cavity’sremarkably high quality factors of approximately 1010, resulting in the most stringent constraintsto date on a substantial portion of the exclusion parameter space on the kinetic mixing coefficientϵ between dark photons and electromagnetic photons, yielding a value of ϵ<2.2×10^(-16).
