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Abstract:

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

Registro:

Documento: Artículo
Título: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
Autor:Aad, G. et al.
Este artículo contiene 2906 autores, consultelos en el artículo en formato pdf.
Filiación: Este artículo contiene 2906 autores con sus filiaciones, consultelas en el artículo en formato pdf.
Año:2013
Volumen:718
Número:4-5
Página de inicio:1284
Página de fin:1302
DOI: http://dx.doi.org/10.1016/j.physletb.2012.11.071
Título revista:Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Título revista abreviado:Phys Lett Sect B Nucl Elem Part High-Energy Phys
ISSN:03702693
CODEN:PYLBA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03702693_v718_n4-5_p1284_Aad

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Citas:

---------- APA ----------
(2013) . 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. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 718(4-5), 1284-1302.
http://dx.doi.org/10.1016/j.physletb.2012.11.071
---------- CHICAGO ----------
Aad, G. "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" . Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 718, no. 4-5 (2013) : 1284-1302.
http://dx.doi.org/10.1016/j.physletb.2012.11.071
---------- MLA ----------
Aad, G. "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" . Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol. 718, no. 4-5, 2013, pp. 1284-1302.
http://dx.doi.org/10.1016/j.physletb.2012.11.071
---------- VANCOUVER ----------
Aad, G. 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. Phys Lett Sect B Nucl Elem Part High-Energy Phys. 2013;718(4-5):1284-1302.
http://dx.doi.org/10.1016/j.physletb.2012.11.071