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dc.date.accessioned 2021-09-27T17:30:48Z
dc.date.available 2021-09-27T17:30:48Z
dc.date.issued 2018-07-12
dc.identifier.uri http://sedici.unlp.edu.ar/handle/10915/125678
dc.description.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+EmissT 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 → Wb, 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-top-quark production are set in the context of an effective field theory model, as well as in an universal extra dimensions model. en
dc.language en es
dc.subject Beyond Standard Model es
dc.subject Hadron-Hadron scattering (experiments) es
dc.subject vector-like quarks es
dc.title 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 en
dc.type Articulo es
sedici.identifier.other doi:10.1007/jhep07(2018)089 es
sedici.identifier.issn 1029-8479 es
sedici.creator.person Alconada Verzini, María Josefina es
sedici.creator.person Alonso, Francisco es
sedici.creator.person Arduh, Francisco Anuar es
sedici.creator.person Dova, María Teresa es
sedici.creator.person Hoya, Joaquín es
sedici.creator.person Monticelli, Fernando Gabriel es
sedici.creator.person Wahlberg, Hernán Pablo es
sedici.creator.corporate The ATLAS Collaboration es
sedici.description.note La lista completa de autores que integran el documento puede consultarse en el archivo. es
sedici.subject.materias Ciencias Exactas es
sedici.subject.materias Física es
sedici.description.fulltext true es
mods.originInfo.place Facultad de Ciencias Exactas es
mods.originInfo.place Instituto de Física La Plata es
sedici.subtype Articulo es
sedici.rights.license Creative Commons Attribution 4.0 International (CC BY 4.0)
sedici.rights.uri http://creativecommons.org/licenses/by/4.0/
sedici.description.peerReview peer-review es
sedici.relation.journalTitle Journal of High Energy Physics es
sedici.relation.journalVolumeAndIssue vol. 2018, no. 7 es


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Creative Commons Attribution 4.0 International (CC BY 4.0) Excepto donde se diga explícitamente, este item se publica bajo la siguiente licencia Creative Commons Attribution 4.0 International (CC BY 4.0)