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Search for heavy particles decaying into a top-quark pair in the fully hadronic final state in pp collisions at s =13 TeV with the ATLAS detector

M., Aaboud ; Åkesson, T. LU orcid ; Bocchetta, S. LU ; Bryngemark, L. LU ; Corrigan, E. LU ; Doglioni, C. LU ; Gregersen, K. LU ; Hansen, E. LU ; Hedberg, V. LU and Jarlskog, G. LU , et al. (2019) In Physical Review D 99(9).
Abstract
A search for new particles decaying into a pair of top quarks is performed using proton-proton collision data recorded with the ATLAS detector at the Large Hadron Collider at a center-of-mass energy of s=13 TeV corresponding to an integrated luminosity of 36.1 fb-1. Events consistent with top-quark pair production and the fully hadronic decay mode of the top quarks are selected by requiring multiple high transverse momentum jets including those containing b-hadrons. Two analysis techniques, exploiting dedicated top-quark pair reconstruction in different kinematic regimes, are used to optimize the search sensitivity to new hypothetical particles over a wide mass range. The invariant mass distribution of the two reconstructed top-quark... (More)
A search for new particles decaying into a pair of top quarks is performed using proton-proton collision data recorded with the ATLAS detector at the Large Hadron Collider at a center-of-mass energy of s=13 TeV corresponding to an integrated luminosity of 36.1 fb-1. Events consistent with top-quark pair production and the fully hadronic decay mode of the top quarks are selected by requiring multiple high transverse momentum jets including those containing b-hadrons. Two analysis techniques, exploiting dedicated top-quark pair reconstruction in different kinematic regimes, are used to optimize the search sensitivity to new hypothetical particles over a wide mass range. The invariant mass distribution of the two reconstructed top-quark candidates is examined for resonant production of new particles with various spins and decay widths. No significant deviation from the Standard Model prediction is observed and limits are set on the production cross-section times branching fraction for new hypothetical Z′ bosons, dark-matter mediators, Kaluza-Klein gravitons and Kaluza-Klein gluons. By comparing with the predicted production cross sections, the Z′ boson in the topcolor-assisted-technicolor model is excluded for masses up to 3.1-3.6 TeV, the dark-matter mediators in a simplified framework are excluded in the mass ranges from 0.8 to 0.9 TeV and from 2.0 to 2.2 TeV, and the Kaluza-Klein gluon is excluded for masses up to 3.4 TeV, depending on the decay widths of the particles. © 2019 CERN, for the ATLAS Collaboration. (Less)
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author collaboration
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review D
volume
99
issue
9
article number
092004
publisher
American Physical Society
external identifiers
  • scopus:85071718240
ISSN
2470-0010
DOI
10.1103/PhysRevD.99.092004
language
English
LU publication?
yes
id
176ef89d-fee7-49aa-b315-f20d95741c84
date added to LUP
2022-04-05 18:38:33
date last changed
2023-04-02 22:44:33
@article{176ef89d-fee7-49aa-b315-f20d95741c84,
  abstract     = {{A search for new particles decaying into a pair of top quarks is performed using proton-proton collision data recorded with the ATLAS detector at the Large Hadron Collider at a center-of-mass energy of s=13 TeV corresponding to an integrated luminosity of 36.1 fb-1. Events consistent with top-quark pair production and the fully hadronic decay mode of the top quarks are selected by requiring multiple high transverse momentum jets including those containing b-hadrons. Two analysis techniques, exploiting dedicated top-quark pair reconstruction in different kinematic regimes, are used to optimize the search sensitivity to new hypothetical particles over a wide mass range. The invariant mass distribution of the two reconstructed top-quark candidates is examined for resonant production of new particles with various spins and decay widths. No significant deviation from the Standard Model prediction is observed and limits are set on the production cross-section times branching fraction for new hypothetical Z′ bosons, dark-matter mediators, Kaluza-Klein gravitons and Kaluza-Klein gluons. By comparing with the predicted production cross sections, the Z′ boson in the topcolor-assisted-technicolor model is excluded for masses up to 3.1-3.6 TeV, the dark-matter mediators in a simplified framework are excluded in the mass ranges from 0.8 to 0.9 TeV and from 2.0 to 2.2 TeV, and the Kaluza-Klein gluon is excluded for masses up to 3.4 TeV, depending on the decay widths of the particles. © 2019 CERN, for the ATLAS Collaboration.}},
  author       = {{M., Aaboud and Åkesson, T. and Bocchetta, S. and Bryngemark, L. and Corrigan, E. and Doglioni, C. and Gregersen, K. and Hansen, E. and Hedberg, V. and Jarlskog, G. and Kalderon, C. and Kellermann, E. and Konya, B. and Lytken, E. and Mankinen, K. and Marcon, C. and Mjörnmark, J. and Mullier, G. and Poettgen, R. and Poulsen, T. and Smirnova, O. and L., Zwalinski}},
  issn         = {{2470-0010}},
  language     = {{eng}},
  number       = {{9}},
  publisher    = {{American Physical Society}},
  series       = {{Physical Review D}},
  title        = {{Search for heavy particles decaying into a top-quark pair in the fully hadronic final state in pp collisions at s =13 TeV with the ATLAS detector}},
  url          = {{http://dx.doi.org/10.1103/PhysRevD.99.092004}},
  doi          = {{10.1103/PhysRevD.99.092004}},
  volume       = {{99}},
  year         = {{2019}},
}