Artículos de revistas
Measurement of the jet mass distribution and top quark mass in hadronic decays of boosted top quarks in pp collisions at √s = 13 TeV
Fecha
2020-05-22Registro en:
Physical Review Letters, v. 124, n. 20, 2020.
1079-7114
0031-9007
10.1103/PhysRevLett.124.202001
2-s2.0-85086052956
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)
Bulgarian Academy of Sciences
University of Sofia
Beihang University
Tsinghua University
Institute of High Energy Physics
Peking University
Zhejiang University
Universidad de Los Andes
Universidad de Antioquia
Mechanical Engineering and Naval Architecture
Faculty of Science
Institute Rudjer Boskovic
University of Cyprus
Charles University
Escuela Politecnica Nacional
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
Institut Polytechnique de Paris
IPHC UMR 7178
CNRS/IN2P3
Institut de Physique Nucléaire de Lyon
Georgian Technical University
Tbilisi State University
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III. Physikalisches Institut A
III. Physikalisches Institut B
Deutsches Elektronen-Synchrotron
University of Hamburg
Karlsruher Institut fuer Technologie
NCSR Demokritos
National and Kapodistrian University of Athens
National Technical University of Athens
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Wigner Research Centre for Physics
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University College Dublin
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Institución
Resumen
A measurement is reported of the jet mass distribution in hadronic decays of boosted top quarks produced in pp collisions at √s = 13 TeV. The data were collected with the CMS detector at the LHC and correspond to an integrated luminosity of 35.9 fb−1. The measurement is performed in the lepton þ jets channel of tt events, where the lepton is an electron or muon. The products of the hadronic top quark decay t → bW → bqq¯0 are reconstructed as a single jet with transverse momentum larger than 400 GeV. The t¯t cross section as a function of the jet mass is unfolded at the particle level and used to extract a value of the top quark mass of 172.6 ± 2.5 GeV. A novel jet reconstruction technique is used for the first time at the LHC, which improves the precision by a factor of 3 relative to an earlier measurement. This highlights the potential of measurements using boosted top quarks, where the new technique will enable future precision measurements.