First Germanium-Based Constraints on Sub-MeV Dark Matter with the EDELWEISS Experiment
Q. Arnaud, E. Armengaud, C. Augier, A. Benoı̂t, L. Bergé, J. Billard, A. Broniatowski, P. Camus, A. Cazes, M. Chapellier, F. Charlieux, M. De Jésus, L. Dumoulin, K. Eitel, E. Elkhoury, J.-B. Fillipini, D. Filosofov, J. Gascon, A. Giuliani, M. Gros, Y. Jin, A. Juillard, M. Kleifges, H. Lattaud, S. Marnieros, D. Misiak, X.-F. Navick, C. Nones, E. Olivieri, C. Oriol, P. Pari, B. Paul, D. V. Poda, S. Rozov, T. Salagnac, V. Sanglard, B. Siebenborn, L. Vagneron, M. Weber, E. Yakushev, A. Zolotarova
Abstract
We present the first Ge-based constraints on sub-MeV/c^{2} dark matter (DM) particles interacting with electrons using a 33.4 g Ge cryogenic detector with a 0.53 electron-hole pair (rms) resolution, operated underground at the Laboratoire Souterrain de Modane. Competitive constraints are set on the DM-electron scattering cross section, as well as on the kinetic mixing parameter of dark photons down to 1 eV/c^{2}. In particular, the most stringent limits are set for dark photon DM in the 6 to 9 eV/c^{2} range. These results demonstrate the high relevance of Ge cryogenic detectors for the search of DM-induced eV-scale electron signals.