First results from BRASS-p broadband searches for hidden photon dark matter
Fayez Bajjali, Sven Dornbusch, M. Ekmedžić, D. Horns, C. Kasemann, A. P. Lobanov, Artak Mkrtchyan, Le Hoang Nguyen, Martin Tluczykont, G. Tuccari, Johannes Ulrichs, G. Wieching, J. A. Zensus
Abstract
Abstract We discuss first results from hidden photon dark matter searches made with a prototype of the Broadband Radiometric Axion/ALPs Search Setup (BRASS-p) in the range of particle mass of 49.63 μeV to 74.44 μeV (frequency range of 12 GHz to 18 GHz). The conceptual design of BRASS and a detailed description of its present prototype, BRASS-p, are given, with a view of the potential application of such setups to hidden photon, axion, and axion-like particle (ALP) dark matter searches using heterodyne detectors in the range of particle mass from 40 μeV to 4000 μeV (10 GHz to 1 THz). Pioneering measurements made with BRASS-p achieve the record sensitivity of (0.3-1.0) × 10 -13 to the kinetic mixing between the normal and hidden photons, assuming the dark matter is made entirely of unpolarized hidden photons. Based on these results, a discussion of further prospects for dark matter searches using the BRASS-p apparatus is presented.