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

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...

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Detalles Bibliográficos
Autores principales: Alconada Verzini, María Josefina, Alonso, Francisco, Arduh, Francisco Anuar, Dova, María Teresa, Monticelli, Fernando Gabriel, Wahlberg, Hernán Pablo, The ATLAS Collaboration
Formato: Articulo
Lenguaje:Inglés
Publicado: 2015
Materias:
Ciencias Exactas
Física
exotics
hadron-hadron scattering
top physics
proton-proton collisions
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/79052
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-79052
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Exactas
Física
exotics
hadron-hadron scattering
top physics
proton-proton collisions
spellingShingle Ciencias Exactas
Física
exotics
hadron-hadron scattering
top physics
proton-proton collisions
Alconada Verzini, María Josefina
Alonso, Francisco
Arduh, Francisco Anuar
Dova, María Teresa
Monticelli, Fernando Gabriel
Wahlberg, Hernán Pablo
The ATLAS Collaboration
A search for t¯t resonances using lepton-plus-jets events in proton-proton collisions at √s = 8 TeV with the ATLAS detector
topic_facet Ciencias Exactas
Física
exotics
hadron-hadron scattering
top physics
proton-proton collisions
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.
format Articulo
Articulo
author Alconada Verzini, María Josefina
Alonso, Francisco
Arduh, Francisco Anuar
Dova, María Teresa
Monticelli, Fernando Gabriel
Wahlberg, Hernán Pablo
The ATLAS Collaboration
author_facet Alconada Verzini, María Josefina
Alonso, Francisco
Arduh, Francisco Anuar
Dova, María Teresa
Monticelli, Fernando Gabriel
Wahlberg, Hernán Pablo
The ATLAS Collaboration
author_sort Alconada Verzini, María Josefina
title A search for t¯t resonances using lepton-plus-jets events in proton-proton collisions at √s = 8 TeV with the ATLAS detector
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 search for t¯t resonances using lepton-plus-jets events in proton-proton collisions at √s = 8 tev with the atlas detector
publishDate 2015
url http://sedici.unlp.edu.ar/handle/10915/79052
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