Measurement of the tt¯ production cross section in the eμ channel in proton-proton collisions at √s=7 and 8 TeV - The, CMSC; Khachatryan, V; Sirunyan, AM; Tumasyan, A; Adam, W; Asilar, E; Bergauer, T; Brandstetter, J; Brondolin, E; Dragicevic, M; Erö, J; Flechl, M; et al. (Journal of High Energy Physics, 2016)