Khachatryan, V.Sirunyan, A. M.Tumasyan, A.Adam, W.Asilar, E.Bergauer, T.The CMS Collaboration2025-03-072025-03-0720160031-90071079-7114https://doi.org/10.1103/PhysRevLett.116.052002https://hdl.handle.net/20.500.12507/2982The top quark pair production cross section is measured for the first time in proton-proton collisions at root s = 13 TeV by the CMS experiment at the CERN LHC, using data corresponding to an integrated luminosity of 43 pb(-1). The measurement is performed by analyzing events with at least one electron and one muon of opposite charge, and at least two jets. The measured cross section is 746 +/- 58(stat) +/- 53(syst) +/- 36(lumi) pb, in agreement with the expectation from the standard model.eninfo:eu-repo/semantics/openAccessArticle1165WOS:0003694950000062-s2.0-849590206362689470310.1103/PhysRevLett.116.052002Q1Q1