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Article: 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
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 |
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Authors | |
Issue Date | 2019 |
Publisher | American Physical Society. The Journal's web site is located at http://journals.aps.org/prd/ |
Citation | Physical Review D: covering particles, fields, gravitation, and cosmology, 2019, v. 99 n. 9, article no. 092004, p. 1-38 How to Cite? |
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 root 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. |
Persistent Identifier | http://hdl.handle.net/10722/271266 |
ISSN | 2023 Impact Factor: 4.6 2023 SCImago Journal Rankings: 1.587 |
ISI Accession Number ID |
DC Field | Value | Language |
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dc.contributor.author | ATLAS Collaboration | - |
dc.contributor.author | Lo, CY | - |
dc.contributor.author | Orlando, N | - |
dc.contributor.author | Paredes Hernandez, DK | - |
dc.contributor.author | Tu, Y | - |
dc.contributor.author | Pizzimento, L | - |
dc.date.accessioned | 2019-06-24T01:06:35Z | - |
dc.date.available | 2019-06-24T01:06:35Z | - |
dc.date.issued | 2019 | - |
dc.identifier.citation | Physical Review D: covering particles, fields, gravitation, and cosmology, 2019, v. 99 n. 9, article no. 092004, p. 1-38 | - |
dc.identifier.issn | 2470-0010 | - |
dc.identifier.uri | http://hdl.handle.net/10722/271266 | - |
dc.description.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 root 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. | - |
dc.language | eng | - |
dc.publisher | American Physical Society. The Journal's web site is located at http://journals.aps.org/prd/ | - |
dc.relation.ispartof | Physical Review D: covering particles, fields, gravitation, and cosmology | - |
dc.rights | This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. | - |
dc.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 | - |
dc.type | Article | - |
dc.identifier.email | Orlando, N: norlando@hku.hk | - |
dc.identifier.email | Paredes Hernandez, DK: dparedes@hku.hk | - |
dc.identifier.email | Tu, Y: yanjuntu@hku.hk | - |
dc.identifier.authority | Tu, Y=rp01971 | - |
dc.description.nature | published_or_final_version | - |
dc.identifier.doi | 10.1103/PhysRevD.99.092004 | - |
dc.identifier.scopus | eid_2-s2.0-85071718240 | - |
dc.identifier.hkuros | 298045 | - |
dc.identifier.volume | 99 | - |
dc.identifier.issue | 9 | - |
dc.identifier.spage | article no. 092004, p. 1 | - |
dc.identifier.epage | article no. 092004, p. 38 | - |
dc.identifier.isi | WOS:000468219700001 | - |
dc.publisher.place | United States | - |
dc.identifier.issnl | 2470-0010 | - |