Dark-Photon Search using Data from CRESST-II Phase 2
  Identifying the nature and origin of dark matter is one of the major challenges for modern astro and particle physics. Direct dark-matter searches aim at an observation of dark-matter particles interacting within detectors. The focus of several such searches is on interactions with nuclei as provided e.g. by Weakly Interacting Massive Particles. However, there is a variety of dark-matter candidates favoring interactions with electrons rather than with nuclei. One example are dark photons, i.e., long-lived vector particles with a kinetic mixing to standard-model photons. In this work we present constraints on this kinetic mixing based on data from CRESST-II Phase 2 corresponding to an exposure before cuts of 52\,kg-days. These constraints improve the existing ones for dark-photon masses between 0.3 and 0.7\,keV/c$^2$. 
G. Angloher, P. Bauer, A. Bento, C. Bucci, L. Canonica, X. Defay, A.   Erb, F. v. Feilitzsch, N. Ferreiro Iachellini, P. Gor...
hep-ex physics.ins-det