First search for dark photon dark matter with a MADMAX prototype

J. Egge, D. Leppla-Weber, S. Knirck, B. Ary dos Santos Garcia, D. Bergermann, A. Caldwell, V. Dabhi, C. Diaconu, J. Diehl, G. Dvali, M. Ekmedžić, F. Gallo, E. Garutti, S. Heyminck, F. Hubaut, A. Ivanov, J. Jochum, P. Karst, M. Kramer, D. Kreikemeyer-Lorenzo, C. Krieger, C. Lee, A. Lindner, J. P. A. Maldonado, B. Majorovits, S. Martens, A. Martini, A. Miyazaki, E. Öz, P. Pralavorio, G. Raffelt, A. Ringwald, J. Redondo, S. Roset, N. Salama, J. Schaffran, A. Schmidt, F. Steffen, C. Strandhagen, I. Usherov, H. Wang, G. Wieching, G. Cancelo, M. Di Federico, G. Hoshino, L. Stefanazzi

Published 2024-08-05Version 1

We report the first result from a dark photon dark matter search in the mass range from ${78.62}$ to $83.95~\mathrm{\mu eV}/c^2$ with a dielectric haloscope prototype for MADMAX (Magnetized Disc and Mirror Axion eXperiment). Putative dark photons would convert to observable photons within a stack consisting of three sapphire disks and a mirror. The emitted power of this system is received by an antenna and successively digitized using a low-noise receiver. No dark photon signal has been observed. Assuming unpolarized dark photon dark matter with a local density of $\rho_{\chi}=0.3~\mathrm{GeV/cm^3}$ we exclude a dark photon to photon mixing parameter $\chi > 3.0 \times 10^{-12}$ over the full mass range and $\chi > 1.2 \times 10^{-13}$ at a mass of $80.57~\mathrm{\mu eV}/c^2$ with a 95\% confidence level. This is the first physics result from a MADMAX prototype and exceeds previous constraints on $\chi$ in this mass range by up to almost three orders of magnitude.