Observation of Top Quark Production in Proton-Nucleus Collisions

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Sirunyan, A. M.
Turnasyan, A.
Adam, W.
Arribrogi, F.
Asilar, E.
Bergauer, T.
Brandstetter, J.
Brondolin, E.
Dragicevic, M.
Ero, J.
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Amer Physical Soc
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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Physical Review Letters. College Pk: Amer Physical Soc, v. 119, n. 24, 17 p., 2017.