Search for pair production of heavy top-like quarks decaying to a high-p T W boson and a b quark in the lepton plus jets final state at √s=7 TeV with the ATLAS detector

A search is presented for production of a heavy up-type quark (t ′ ) together with its antiparticle, assuming a significant branching ratio for subsequent decay into a W boson and a b quark. The search is based on 4.7 fb −1 of pp collisions at s=7 TeV recorded in 2011 with the ATLAS detector at the...

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Publicado: 2013
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03702693_v718_n4-5_p1284_Aad
http://hdl.handle.net/20.500.12110/paper_03702693_v718_n4-5_p1284_Aad
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling paper:paper_03702693_v718_n4-5_p1284_Aad2023-06-08T15:37:09Z Search for pair production of heavy top-like quarks decaying to a high-p T W boson and a b quark in the lepton plus jets final state at √s=7 TeV with the ATLAS detector A search is presented for production of a heavy up-type quark (t ′ ) together with its antiparticle, assuming a significant branching ratio for subsequent decay into a W boson and a b quark. The search is based on 4.7 fb −1 of pp collisions at s=7 TeV recorded in 2011 with the ATLAS detector at the CERN Large Hadron Collider. Data are analyzed in the lepton + jets final state, characterized by a high-transverse-momentum isolated electron or muon, large missing transverse momentum and at least three jets. The analysis strategy relies on the substantial boost of the W bosons in the t ′ t¯ ′ signal when m t ′ ≳400 GeV. No significant excess of events above the Standard Model expectation is observed and the result of the search is interpreted in the context of fourth-generation and vector-like quark models. Under the assumption of a branching ratio BR(t ′ →Wb)=1, a fourth-generation t ′ quark with mass lower than 656 GeV is excluded at 95% confidence level. In addition, in light of the recent discovery of a new boson of mass ∼126 GeV at the LHC, upper limits are derived in the two-dimensional plane of BR(t ′ →Wb) versus BR(t ′ →Ht), where H is the Standard Model Higgs boson, for vector-like quarks of various masses. © 2012 CERN 2013 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03702693_v718_n4-5_p1284_Aad http://hdl.handle.net/20.500.12110/paper_03702693_v718_n4-5_p1284_Aad
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description A search is presented for production of a heavy up-type quark (t ′ ) together with its antiparticle, assuming a significant branching ratio for subsequent decay into a W boson and a b quark. The search is based on 4.7 fb −1 of pp collisions at s=7 TeV recorded in 2011 with the ATLAS detector at the CERN Large Hadron Collider. Data are analyzed in the lepton + jets final state, characterized by a high-transverse-momentum isolated electron or muon, large missing transverse momentum and at least three jets. The analysis strategy relies on the substantial boost of the W bosons in the t ′ t¯ ′ signal when m t ′ ≳400 GeV. No significant excess of events above the Standard Model expectation is observed and the result of the search is interpreted in the context of fourth-generation and vector-like quark models. Under the assumption of a branching ratio BR(t ′ →Wb)=1, a fourth-generation t ′ quark with mass lower than 656 GeV is excluded at 95% confidence level. In addition, in light of the recent discovery of a new boson of mass ∼126 GeV at the LHC, upper limits are derived in the two-dimensional plane of BR(t ′ →Wb) versus BR(t ′ →Ht), where H is the Standard Model Higgs boson, for vector-like quarks of various masses. © 2012 CERN
title Search for pair production of heavy top-like quarks decaying to a high-p T W boson and a b quark in the lepton plus jets final state at √s=7 TeV with the ATLAS detector
spellingShingle Search for pair production of heavy top-like quarks decaying to a high-p T W boson and a b quark in the lepton plus jets final state at √s=7 TeV with the ATLAS detector
title_short Search for pair production of heavy top-like quarks decaying to a high-p T W boson and a b quark in the lepton plus jets final state at √s=7 TeV with the ATLAS detector
title_full Search for pair production of heavy top-like quarks decaying to a high-p T W boson and a b quark in the lepton plus jets final state at √s=7 TeV with the ATLAS detector
title_fullStr Search for pair production of heavy top-like quarks decaying to a high-p T W boson and a b quark in the lepton plus jets final state at √s=7 TeV with the ATLAS detector
title_full_unstemmed Search for pair production of heavy top-like quarks decaying to a high-p T W boson and a b quark in the lepton plus jets final state at √s=7 TeV with the ATLAS detector
title_sort search for pair production of heavy top-like quarks decaying to a high-p t w boson and a b quark in the lepton plus jets final state at √s=7 tev with the atlas detector
publishDate 2013
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03702693_v718_n4-5_p1284_Aad
http://hdl.handle.net/20.500.12110/paper_03702693_v718_n4-5_p1284_Aad
_version_ 1768545331104972800

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