Journal
PHYSICAL REVIEW LETTERS
Volume 119, Issue 24, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.119.242001
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- STFC [1707996, ST/H000925/1, 1708249, PP/E000479/1] Funding Source: UKRI
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- Direct For Mathematical & Physical Scien [1606321, 1508869, 1506130] Funding Source: National Science Foundation
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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 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.
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