A search for t¯t resonances using lepton-plus-jets events in proton-proton collisions at √s = 8 TeV with the ATLAS detector

Autores
Alconada Verzini, María Josefina; Alonso, Francisco; Arduh, Francisco Anuar; Dova, María Teresa; Monticelli, Fernando Gabriel; Wahlberg, Hernán Pablo; The ATLAS Collaboration
Año de publicación
2015
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
A search for new particles that decay into top quark pairs is reported. The search is performed with the ATLAS experiment at the LHC using an integrated luminosity of 20.3 fb−1 of proton-proton collision data collected at a centre-of-mass energy of √s = 8TeV. The lepton-plus-jets final state is used, where the top pair decays to W+bW−¯b, with one W boson decaying leptonically and the other hadronically. The invariant mass spectrum of top quark pairs is examined for local excesses or deficits that are inconsistent with the Standard Model predictions. No evidence for a top quark pair resonance is found, and 95% confidence-level limits on the production rate are determined for massive states in benchmark models. The upper limits on the cross-section times branching ratio of a narrow Z' boson decaying to top pairs range from 4.2 pb to 0.03 pb for resonance masses from 0.4TeV to 3.0TeV. A narrow leptophobic topcolour Z' boson with mass below 1.8TeV is excluded. Upper limits are set on the cross-section times branching ratio for a broad colour-octet resonance with Γ/m = 15% decaying to t¯t. These range from 4.8 pb to 0.03 pb for masses from 0.4TeV to 3.0TeV. A Kaluza-Klein excitation of the gluon in a Randall-Sundrum model is excluded for masses below 2.2TeV.
Facultad de Ciencias Exactas
Materia
Ciencias Exactas
Física
exotics
hadron-hadron scattering
top physics
proton-proton collisions
Nivel de accesibilidad
acceso abierto
Condiciones de uso
http://creativecommons.org/licenses/by/4.0/
Repositorio
SEDICI (UNLP)
Institución
Universidad Nacional de La Plata
OAI Identificador
oai:sedici.unlp.edu.ar:10915/79052

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network_name_str SEDICI (UNLP)
spelling A search for t¯t resonances using lepton-plus-jets events in proton-proton collisions at √s = 8 TeV with the ATLAS detectorAlconada Verzini, María JosefinaAlonso, FranciscoArduh, Francisco AnuarDova, María TeresaMonticelli, Fernando GabrielWahlberg, Hernán PabloThe ATLAS CollaborationCiencias ExactasFísicaexoticshadron-hadron scatteringtop physicsproton-proton collisionsA search for new particles that decay into top quark pairs is reported. The search is performed with the ATLAS experiment at the LHC using an integrated luminosity of 20.3 fb−1 of proton-proton collision data collected at a centre-of-mass energy of √s = 8TeV. The lepton-plus-jets final state is used, where the top pair decays to W+bW−¯b, with one W boson decaying leptonically and the other hadronically. The invariant mass spectrum of top quark pairs is examined for local excesses or deficits that are inconsistent with the Standard Model predictions. No evidence for a top quark pair resonance is found, and 95% confidence-level limits on the production rate are determined for massive states in benchmark models. The upper limits on the cross-section times branching ratio of a narrow Z' boson decaying to top pairs range from 4.2 pb to 0.03 pb for resonance masses from 0.4TeV to 3.0TeV. A narrow leptophobic topcolour Z' boson with mass below 1.8TeV is excluded. Upper limits are set on the cross-section times branching ratio for a broad colour-octet resonance with Γ/m = 15% decaying to t¯t. These range from 4.8 pb to 0.03 pb for masses from 0.4TeV to 3.0TeV. A Kaluza-Klein excitation of the gluon in a Randall-Sundrum model is excluded for masses below 2.2TeV.Facultad de Ciencias Exactas2015-08-28info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfhttp://sedici.unlp.edu.ar/handle/10915/79052enginfo:eu-repo/semantics/altIdentifier/issn/1029-8479info:eu-repo/semantics/altIdentifier/doi/10.1007/JHEP08(2015)148info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by/4.0/Creative Commons Attribution 4.0 International (CC BY 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-09-29T11:12:04Zoai:sedici.unlp.edu.ar:10915/79052Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-29 11:12:04.637SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv A search for t¯t resonances using lepton-plus-jets events in proton-proton collisions at √s = 8 TeV with the ATLAS detector
title A search for t¯t resonances using lepton-plus-jets events in proton-proton collisions at √s = 8 TeV with the ATLAS detector
spellingShingle A search for t¯t resonances using lepton-plus-jets events in proton-proton collisions at √s = 8 TeV with the ATLAS detector
Alconada Verzini, María Josefina
Ciencias Exactas
Física
exotics
hadron-hadron scattering
top physics
proton-proton collisions
title_short A search for t¯t resonances using lepton-plus-jets events in proton-proton collisions at √s = 8 TeV with the ATLAS detector
title_full A search for t¯t resonances using lepton-plus-jets events in proton-proton collisions at √s = 8 TeV with the ATLAS detector
title_fullStr A search for t¯t resonances using lepton-plus-jets events in proton-proton collisions at √s = 8 TeV with the ATLAS detector
title_full_unstemmed A search for t¯t resonances using lepton-plus-jets events in proton-proton collisions at √s = 8 TeV with the ATLAS detector
title_sort A search for t¯t resonances using lepton-plus-jets events in proton-proton collisions at √s = 8 TeV with the ATLAS detector
dc.creator.none.fl_str_mv Alconada Verzini, María Josefina
Alonso, Francisco
Arduh, Francisco Anuar
Dova, María Teresa
Monticelli, Fernando Gabriel
Wahlberg, Hernán Pablo
The ATLAS Collaboration
author Alconada Verzini, María Josefina
author_facet Alconada Verzini, María Josefina
Alonso, Francisco
Arduh, Francisco Anuar
Dova, María Teresa
Monticelli, Fernando Gabriel
Wahlberg, Hernán Pablo
The ATLAS Collaboration
author_role author
author2 Alonso, Francisco
Arduh, Francisco Anuar
Dova, María Teresa
Monticelli, Fernando Gabriel
Wahlberg, Hernán Pablo
The ATLAS Collaboration
author2_role author
author
author
author
author
author
dc.subject.none.fl_str_mv Ciencias Exactas
Física
exotics
hadron-hadron scattering
top physics
proton-proton collisions
topic Ciencias Exactas
Física
exotics
hadron-hadron scattering
top physics
proton-proton collisions
dc.description.none.fl_txt_mv A search for new particles that decay into top quark pairs is reported. The search is performed with the ATLAS experiment at the LHC using an integrated luminosity of 20.3 fb−1 of proton-proton collision data collected at a centre-of-mass energy of √s = 8TeV. The lepton-plus-jets final state is used, where the top pair decays to W+bW−¯b, with one W boson decaying leptonically and the other hadronically. The invariant mass spectrum of top quark pairs is examined for local excesses or deficits that are inconsistent with the Standard Model predictions. No evidence for a top quark pair resonance is found, and 95% confidence-level limits on the production rate are determined for massive states in benchmark models. The upper limits on the cross-section times branching ratio of a narrow Z' boson decaying to top pairs range from 4.2 pb to 0.03 pb for resonance masses from 0.4TeV to 3.0TeV. A narrow leptophobic topcolour Z' boson with mass below 1.8TeV is excluded. Upper limits are set on the cross-section times branching ratio for a broad colour-octet resonance with Γ/m = 15% decaying to t¯t. These range from 4.8 pb to 0.03 pb for masses from 0.4TeV to 3.0TeV. A Kaluza-Klein excitation of the gluon in a Randall-Sundrum model is excluded for masses below 2.2TeV.
Facultad de Ciencias Exactas
description A search for new particles that decay into top quark pairs is reported. The search is performed with the ATLAS experiment at the LHC using an integrated luminosity of 20.3 fb−1 of proton-proton collision data collected at a centre-of-mass energy of √s = 8TeV. The lepton-plus-jets final state is used, where the top pair decays to W+bW−¯b, with one W boson decaying leptonically and the other hadronically. The invariant mass spectrum of top quark pairs is examined for local excesses or deficits that are inconsistent with the Standard Model predictions. No evidence for a top quark pair resonance is found, and 95% confidence-level limits on the production rate are determined for massive states in benchmark models. The upper limits on the cross-section times branching ratio of a narrow Z' boson decaying to top pairs range from 4.2 pb to 0.03 pb for resonance masses from 0.4TeV to 3.0TeV. A narrow leptophobic topcolour Z' boson with mass below 1.8TeV is excluded. Upper limits are set on the cross-section times branching ratio for a broad colour-octet resonance with Γ/m = 15% decaying to t¯t. These range from 4.8 pb to 0.03 pb for masses from 0.4TeV to 3.0TeV. A Kaluza-Klein excitation of the gluon in a Randall-Sundrum model is excluded for masses below 2.2TeV.
publishDate 2015
dc.date.none.fl_str_mv 2015-08-28
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Articulo
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://sedici.unlp.edu.ar/handle/10915/79052
url http://sedici.unlp.edu.ar/handle/10915/79052
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/issn/1029-8479
info:eu-repo/semantics/altIdentifier/doi/10.1007/JHEP08(2015)148
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by/4.0/
Creative Commons Attribution 4.0 International (CC BY 4.0)
eu_rights_str_mv openAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by/4.0/
Creative Commons Attribution 4.0 International (CC BY 4.0)
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:SEDICI (UNLP)
instname:Universidad Nacional de La Plata
instacron:UNLP
reponame_str SEDICI (UNLP)
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instname_str Universidad Nacional de La Plata
instacron_str UNLP
institution UNLP
repository.name.fl_str_mv SEDICI (UNLP) - Universidad Nacional de La Plata
repository.mail.fl_str_mv alira@sedici.unlp.edu.ar
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