Search for pair production of vectorlike quarks in the fully hadronic final state

CMS Collaboration

doi:10.1103/PhysRevD.100.072001

Search for pair production of vectorlike quarks in the fully hadronic final state

CMS Collaboration

Yerevan Physics Institute
Institut für Hochenergiephysik
Vienna University of Technology
Institute for Nuclear Problems of Belarusian State University
University of Antwerp
Université Paris-Saclay
c/o DESY
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University of Louvain
Centro Brasileiro de Pesquisas Fisicas
Rua São Francisco de Xavier
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Universidade Federal do Rio Grande do Sul
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São Paulo State University
Federal University of ABC (UFABC)
Institute for Nuclear Research and Nuclear Energy Bulgarian Academy of Sciences
University of Sofia
Beihang University
Institute of High Energy Physics, Chinese Academy of Sciences
University of Chinese Academy of Sciences
State Key Laboratory of Nuclear Physics and Technology
Tsinghua University
Universidad de Los Andes, Colombia
Universidad de Antioquia
Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture, University of Split
Faculty of Science, University of Split
Ruđer Bošković Institute
Institute for Theoretical and Experimental Physics
University of Cyprus
Charles University
Joint Institute for Nuclear Research, Dubna
Escuela Politecnica Nacional
Universidad San Francisco de Quito
Egyptian Network of High Energy Physics
British University in Egypt
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National Institute of Chemical Physics and Biophysics, Tallinn
University of Helsinki
Helsinki Institute of Physics
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European Organization for Nuclear Research
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Eötvös Loránd University
University of Debrecen
Wigner Research Centre for Physics
Institute of Nuclear Research ATOMKI
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Indian Institute of Science
National Institute of Science Education and Research
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Panjab University
University of Delhi
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University of Visva-Bharati
Indian Institute of Technology Madras
Bhabha Atomic Research Centre
Tata Institute of Fundamental Research, Mumbai
Indian Institute of Science Education and Research (IISER)
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ENEA Climate Modeling and Impacts
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Istituto Nazionale di Fisica Nucleare, Sezione di Firenze
University of Florence
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University of Florida
Imperial College London
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Abstract

The results of two searches for pair production of vectorlike T or B quarks in fully hadronic final states are presented, using data from the CMS experiment at a center-of-mass energy of 13 TeV. The data were collected at the LHC during 2016 and correspond to an integrated luminosity of 35.9 fb-1. A cut-based analysis specifically targets the bW decay mode of the T quark and allows for the reconstruction of the T quark candidates. In a second analysis, a multiclassification algorithm, the "boosted event shape tagger," is deployed to label candidate jets as originating from top quarks, and W, Z, and H. Candidate events are categorized according to the multiplicities of identified jets, and the scalar sum of all observed jet momenta is used to discriminate signal events from the quantum chromodynamics multijet background. Both analyses probe all possible branching fraction combinations of the T and B quarks and set limits at 95% confidence level on their masses, ranging from 740 to 1370 GeV. These results represent a significant improvement relative to existing searches in the fully hadronic final state.

Original language	English
Article number	072001
Journal	Physical Review D
Volume	100
Issue number	7
DOIs	https://doi.org/10.1103/PhysRevD.100.072001
Publication status	Published - 8 Oct 2019
Externally published	Yes

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10.1103/PhysRevD.100.072001

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@article{4e9bda66326b4387b56552709d857f01,

title = "Search for pair production of vectorlike quarks in the fully hadronic final state",

abstract = "The results of two searches for pair production of vectorlike T or B quarks in fully hadronic final states are presented, using data from the CMS experiment at a center-of-mass energy of 13 TeV. The data were collected at the LHC during 2016 and correspond to an integrated luminosity of 35.9 fb-1. A cut-based analysis specifically targets the bW decay mode of the T quark and allows for the reconstruction of the T quark candidates. In a second analysis, a multiclassification algorithm, the {"}boosted event shape tagger,{"} is deployed to label candidate jets as originating from top quarks, and W, Z, and H. Candidate events are categorized according to the multiplicities of identified jets, and the scalar sum of all observed jet momenta is used to discriminate signal events from the quantum chromodynamics multijet background. Both analyses probe all possible branching fraction combinations of the T and B quarks and set limits at 95\% confidence level on their masses, ranging from 740 to 1370 GeV. These results represent a significant improvement relative to existing searches in the fully hadronic final state.",

author = "\{CMS Collaboration\} and Sirunyan, \{A. M.\} and A. Tumasyan and W. Adam and F. Ambrogi and T. Bergauer and J. Brandstetter and M. Dragicevic and J. Er{\"o} and \{Escalante Del Valle\}, A. and M. Flechl and R. Fr{\"u}hwirth and M. Jeitler and N. Krammer and I. Kr{\"a}tschmer and D. Liko and T. Madlener and I. Mikulec and N. Rad and J. Schieck and R. Sch{\"o}fbeck and M. Spanring and D. Spitzbart and W. Waltenberger and Wulz, \{C. E.\} and M. Zarucki and V. Drugakov and V. Mossolov and \{Suarez Gonzalez\}, J. and Darwish, \{M. R.\} and \{De Wolf\}, \{E. A.\} and \{Di Croce\}, D. and X. Janssen and J. Lauwers and A. Lelek and M. Pieters and \{Rejeb Sfar\}, H. and \{Van Haevermaet\}, H. and \{Van Mechelen\}, P. and \{Van Putte\}, S. and \{Van Remortel\}, N. and F. Beaudette and \{Granier de Cassagnac\}, R. and M. Nguyen and C. Ochando and P. Paganini and R. Salerno and A. Zabi and A. Zghiche and \{De Wit\}, A. and A. Cappati",

note = "Publisher Copyright: {\textcopyright} 2019 CERN.",

year = "2019",

month = oct,

day = "8",

doi = "10.1103/PhysRevD.100.072001",

language = "English",

volume = "100",

journal = "Physical Review D",

issn = "2470-0010",

publisher = "American Physical Society",

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TY - JOUR

T1 - Search for pair production of vectorlike quarks in the fully hadronic final state

AU - CMS Collaboration

AU - Sirunyan, A. M.

AU - Tumasyan, A.

AU - Adam, W.

AU - Ambrogi, F.

AU - Bergauer, T.

AU - Brandstetter, J.

AU - Dragicevic, M.

AU - Erö, J.

AU - Escalante Del Valle, A.

AU - Flechl, M.

AU - Frühwirth, R.

AU - Jeitler, M.

AU - Krammer, N.

AU - Krätschmer, I.

AU - Liko, D.

AU - Madlener, T.

AU - Mikulec, I.

AU - Rad, N.

AU - Schieck, J.

AU - Schöfbeck, R.

AU - Spanring, M.

AU - Spitzbart, D.

AU - Waltenberger, W.

AU - Wulz, C. E.

AU - Zarucki, M.

AU - Drugakov, V.

AU - Mossolov, V.

AU - Suarez Gonzalez, J.

AU - Darwish, M. R.

AU - De Wolf, E. A.

AU - Di Croce, D.

AU - Janssen, X.

AU - Lauwers, J.

AU - Lelek, A.

AU - Pieters, M.

AU - Rejeb Sfar, H.

AU - Van Haevermaet, H.

AU - Van Mechelen, P.

AU - Van Putte, S.

AU - Van Remortel, N.

AU - Beaudette, F.

AU - Granier de Cassagnac, R.

AU - Nguyen, M.

AU - Ochando, C.

AU - Paganini, P.

AU - Salerno, R.

AU - Zabi, A.

AU - Zghiche, A.

AU - De Wit, A.

AU - Cappati, A.

PY - 2019/10/8

Y1 - 2019/10/8

N2 - The results of two searches for pair production of vectorlike T or B quarks in fully hadronic final states are presented, using data from the CMS experiment at a center-of-mass energy of 13 TeV. The data were collected at the LHC during 2016 and correspond to an integrated luminosity of 35.9 fb-1. A cut-based analysis specifically targets the bW decay mode of the T quark and allows for the reconstruction of the T quark candidates. In a second analysis, a multiclassification algorithm, the "boosted event shape tagger," is deployed to label candidate jets as originating from top quarks, and W, Z, and H. Candidate events are categorized according to the multiplicities of identified jets, and the scalar sum of all observed jet momenta is used to discriminate signal events from the quantum chromodynamics multijet background. Both analyses probe all possible branching fraction combinations of the T and B quarks and set limits at 95% confidence level on their masses, ranging from 740 to 1370 GeV. These results represent a significant improvement relative to existing searches in the fully hadronic final state.

AB - The results of two searches for pair production of vectorlike T or B quarks in fully hadronic final states are presented, using data from the CMS experiment at a center-of-mass energy of 13 TeV. The data were collected at the LHC during 2016 and correspond to an integrated luminosity of 35.9 fb-1. A cut-based analysis specifically targets the bW decay mode of the T quark and allows for the reconstruction of the T quark candidates. In a second analysis, a multiclassification algorithm, the "boosted event shape tagger," is deployed to label candidate jets as originating from top quarks, and W, Z, and H. Candidate events are categorized according to the multiplicities of identified jets, and the scalar sum of all observed jet momenta is used to discriminate signal events from the quantum chromodynamics multijet background. Both analyses probe all possible branching fraction combinations of the T and B quarks and set limits at 95% confidence level on their masses, ranging from 740 to 1370 GeV. These results represent a significant improvement relative to existing searches in the fully hadronic final state.

U2 - 10.1103/PhysRevD.100.072001

DO - 10.1103/PhysRevD.100.072001

M3 - Article

AN - SCOPUS:85074320825

SN - 2470-0010

VL - 100

JO - Physical Review D

JF - Physical Review D

IS - 7

M1 - 072001

ER -

Search for pair production of vectorlike quarks in the fully hadronic final state

Abstract

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