2021/10/26 by Villalba, Carlos Vico
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex)
paper · doi:10.48550/arxiv.2110.13510
The top quark pair production cross section is measured in proton-proton collisions at a center-of-mass energy of 5.02 TeV. The data collected in 2017 by the CMS experiment at the LHC corresponding to an integrated luminosity of 304 pb-1 are analyzed. The measurement is performed using events with one electron and one muon of opposite sign, and at least two jets. The measured cross section is found to be σ_tt~=~60.3~±5.0~(stat)±2.8~(syst)±0.9~(lumi) pb. To reduce the statistical uncertainty, a combination with the result in the ℓ+jets channel, based on 27.4 pb-1 of data collected in 2015 at the same center-of-mass energy of 5.02 TeV, is then performed, obtaining a value of σ_tt~=~62.6~±4.1~(stat)±3.0~(syst+lumi) pb, with a total uncertainty of 7.9%, in agreement with the standard model.