Observation of Top Quark Production in Proton-Nucleus Collisions
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Tarih
2017
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American Physical Society Sites
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The 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 ? sNN = 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 five standard deviations. The measured cross section is ?tt = 45 ± 8 nb, consistent with predictions from perturbative quantum chromodynamics.
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