Observation of the decays B0(s) → Ds1(2536)∓K± - Aaij, Roel; Bachmann, Sebastian; Berninghoff, Daniel; Borsato, Martino; Carus, Leon; Caspary, Rowina; Cocha Toapaxi, Carlos; De Cian, Michel; Frau, Giulia; Günther, Paul André; Han, Xiaoxue; Hansmann-Menzemer, Stephanie; et al. (Journal of high energy physics, 2023)