Observation of Top Quark Production in Proton-Nucleus Collisions

(CMS Collaboration)

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39 Scopus citations


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 5 standard deviations. The measured cross section is σtt=45±8 nb, consistent with predictions from perturbative quantum chromodynamics.

Original languageEnglish (US)
Article number242001
JournalPhysical review letters
Issue number24
StatePublished - Dec 14 2017

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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