Yetkin, Elif Aslı2020-11-042020-11-042017-12-14https://hdl.handle.net/11411/2430https://doi.org/10.1103/PhysRevLett.119.242001The first observation of top quark production in proton-nucleus collisions is reported using proton-lead data collected by the CMS experiment at the CERN LHC at a nucleon-nucleon center-of-mass energy of root(S)(NN) = 8.16 TeV. The measurement is performed using events with exactly one isolated electron or muon candidate and at least four jets. The data sample corresponds to an integrated luminosity of 174 nb(-1). The significance of the tt signal against the background-only hypothesis is above 5 standard deviations. The measured cross section is sigma(tt) = 45 +/- 8 nb, consistent with predictions from perturbative quantum chromodynamics.eninfo:eu-repo/semantics/openAccessBOSON PRODUCTIONPPB COLLISIONSArticle2-s2.0-8503859761810.1103/PhysRevLett.119.24200129286735Q1Q1WOS:000417934800002