Search for pair production of up-type vector-like quarks and for four-top-quark events in final states with multiple b-jets with the ATLAS detector (2018)
- Authors:
- Autor USP: LEITE, MARCO AURELIO LISBOA - IF
- Unidade: IF
- DOI: 10.1007/jhep07(2018)089
- Subjects: COLISÕES DE ÍONS PESADOS RELATIVÍSTICOS; ESPALHAMENTO; LHC
- Keywords: BEYOND STANDARD MODEL; HADRON-HADRON SCATTERING (EXPERIMENTS); VECTOR-LIKE QUARKS
- Agências de fomento:
- Language: Inglês
- Abstract: A search for pair production of up-type vector-like quarks (T) with a significant branching ratio into a top quark and either a Standard Model Higgs boson or a Z boson is presented. The same analysis is also used to search for four-top-quark production in several new physics scenarios. The search is based on a dataset of pp collisions at √ s = 13 TeV recorded in 2015 and 2016 with the ATLAS detector at the CERN Large Hadron Collider and corresponds to an integrated luminosity of 36.1 fb−1 . Data are analysed in the lepton+jets final state, characterised by an isolated electron or muon with high transverse momentum, large missing transverse momentum and multiple jets, as well as the jets+Emiss T final state, characterised by multiple jets and large missing transverse momentum. The search exploits the high multiplicity of jets identified as originating from b-quarks, and the presence of boosted, hadronically decaying top quarks and Higgs bosons reconstructed as large-radius jets, characteristic of signal events. No significant excess above the Standard Model expectation is observed, and 95% CL upper limits are set on the production cross sections for the different signal processes considered. These cross-section limits are used to derive lower limits on the mass of a vector-like T quark under several branching ratio hypotheses assuming contributions from T → W b, Zt, Ht decays. The 95% CL observed lower limits on the T quark mass range between 0.99 TeV and 1.43 TeV for all possible values of the branching ratios into the three decay modes considered, significantly extending the reach beyond that of previous searches. Additionally, upper limits on anomalous four-topquark production are set in the context of an effective field theory model, as well as in an universal extra dimensions model.
- Imprenta:
- Source:
- Título: Journal of High Energy Physics
- ISSN: 1029-8479
- Volume/Número/Paginação/Ano: v. 2018, n. 89, p. 1-68, 2018
- Este periódico é de acesso aberto
- Este artigo NÃO é de acesso aberto
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ABNT
AABOUD, M et al. Search for pair production of up-type vector-like quarks and for four-top-quark events in final states with multiple b-jets with the ATLAS detector. Journal of High Energy Physics, v. 2018, n. 89, p. 1-68, 2018Tradução . . Disponível em: https://doi.org/10.1007/jhep07(2018)089. Acesso em: 24 jan. 2026. -
APA
Aaboud, M., Donadelli, M., Rosa Navarro, J. L. L., & Leite, M. A. L. (2018). Search for pair production of up-type vector-like quarks and for four-top-quark events in final states with multiple b-jets with the ATLAS detector. Journal of High Energy Physics, 2018( 89), 1-68. doi:10.1007/jhep07(2018)089 -
NLM
Aaboud M, Donadelli M, Rosa Navarro JLL, Leite MAL. Search for pair production of up-type vector-like quarks and for four-top-quark events in final states with multiple b-jets with the ATLAS detector [Internet]. Journal of High Energy Physics. 2018 ; 2018( 89): 1-68.[citado 2026 jan. 24 ] Available from: https://doi.org/10.1007/jhep07(2018)089 -
Vancouver
Aaboud M, Donadelli M, Rosa Navarro JLL, Leite MAL. Search for pair production of up-type vector-like quarks and for four-top-quark events in final states with multiple b-jets with the ATLAS detector [Internet]. Journal of High Energy Physics. 2018 ; 2018( 89): 1-68.[citado 2026 jan. 24 ] Available from: https://doi.org/10.1007/jhep07(2018)089 - Search for the Higgs boson produced in association with a W boson and decaying to four b-quarks via two spin-zero particles in pp collisions at 13 TeV with the ATLAS detector
- Search for supersymmetry at 's POT. 1/2' = 13 TeV in final states with jets and two same-sign leptons or three leptons with the ATLAS detector
- Search for single production of vector-like quarks decaying into Wb in pp collisions at 's POT. 1/2'= 8 TeV with the ATLAS detector
- Measurement of the charged-particle multiplicity inside jets from 's POT. 1/2'= 8 TeV pp collisions with the ATLAS detector
- Search for charged Higgs bosons decaying via 'H' POT. ±''SETA''tau' POT. ±''nü' IND. 'tau' in the 'tau'+jets and 'tau'+lepton final states with 36 'fb POT. −1' of pp collision data recorded at 's POT. 1/2'=13 TeV with the ATLAS experiment
- Correlated long-range mixed-harmonic fluctuations measured in pp, p+'PB' and low-multiplicity 'PB'+'PB' collisions with the ATLAS detector
- Search for higgs boson decays to beyond-the-standard-model light bosons in four-lepton events with the ATLAS detector at 's POT. 1/21=13 TeV
- Measurement of the nuclear modification factor for high-'p IND. T' charged hadrons in p+'PB' collisions with the ATLAS detector
- Search for photonic signatures of gauge-mediated supersymmetry in 13 TeV pp collisions with the ATLAS detector
- Measurement of the inclusive cross-sections of single top-quark and top-antiquark 'tau'-channel production in pp collisions at 's POT. 1/2' = 13 TeV with the ATLAS detector
Informações sobre o DOI: 10.1007/jhep07(2018)089 (Fonte: oaDOI API)
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