Sterile-neutrino search based on 259 days of KATRIN data - Acharya, H; Aker, M; Aker, M; Batzler, D; Beglarian, A; Beglarian, A; Beisenkotter, J; Beisenkotter, J; Biassoni, M; Bieringer, B; Biondi, Y; Bottcher, M; et al. (NATURE, 2025)