Observation of Top Quark Production in Proton-Nucleus Collisions


Sirunyan A. M. , Turnasyan A., Adam W., Arribrogi F., Asilar E., Bergauer T., ...More

PHYSICAL REVIEW LETTERS, vol.119, no.24, 2017 (Journal Indexed in SCI) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 119 Issue: 24
  • Publication Date: 2017
  • Doi Number: 10.1103/physrevlett.119.242001
  • Title of Journal : PHYSICAL REVIEW LETTERS

Abstract

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.