Artículos de revistas
Observation of Top Quark Production in Proton-Nucleus Collisions
Fecha
2017-12-14Registro en:
Physical Review Letters, v. 119, n. 24, 2017.
1079-7114
0031-9007
10.1103/PhysRevLett.119.242001
2-s2.0-85038597618
Autor
Yerevan Physics Institute
Institut für Hochenergiephysik
Institute for Nuclear Problems
Universiteit Antwerpen
Vrije Universiteit Brussel
Université Libre de Bruxelles
Ghent University
Université Catholique de Louvain
Centro Brasileiro de Pesquisas Fisicas
Universidade do Estado do Rio de Janeiro (UERJ)
Universidade Estadual Paulista (UNESP)
Universidade Federal do ABC (UFABC)
Bulgaria Academy of Sciences
University of Sofia
Beihang University
Institute of High Energy Physics
Peking University
Tsinghua University
Universidad de Los Andes
Mechanical Engineering and Naval Architecture
Faculty of Science
Institute Rudjer Boskovic
University of Cyprus
Charles University
Universidad San Francisco de Quito
Egyptian Network of High Energy Physics
National Institute of Chemical Physics and Biophysics
University of Helsinki
Helsinki Institute of Physics
Lappeenranta University of Technology
Université Paris-Saclay
IPHC UMR 7178
CNRS/IN2P3
Institut de Physique Nucléaire de Lyon
Georgian Technical University
Tbilisi State University
I. Physikalisches Institut
III. Physikalisches Institut A
III. Physikalisches Institut B
Deutsches Elektronen-Synchrotron
University of Hamburg
Institut für Experimentelle Kernphysik
NCSR Demokritos
National and Kapodistrian University of Athens
National Technical University of Athens
University of Ioánnina
Eötvös Loránd University
Wigner Research Centre for Physics
Institute of Nuclear Research ATOMKI
University of Debrecen
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HBNI
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Bhabha Atomic Research Centre
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Institución
Resumen
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.