A search for tt resonances with the ATLAS detector in 2.05 fb −1 of proton-proton collisions at √ s =7 TeV

The ATLAS Collaboration

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

A search for top quark pair resonances in final states containing at least one electron or muon has been performed with the ATLAS experiment at the CERN Large Hadron Collider. The search uses a data sample corresponding to an integrated luminosity of 2.05 fb−1, which was recorded in 2011 at a proton-proton centre-of-mass energy of 7 TeV. No evidence for a resonance is found and limits are set on the production cross-section times branching ratio to tt for narrow and wide resonances. For narrow Z′ bosons, the observed 95 % Bayesian credibility level limits range from 9.3 pb to 0.95 pb for masses in the range of mZ′ = 500 GeV to mZ ′= 1300 GeV. The corresponding excluded mass region for a leptophobic topcolour Z′ boson (Kaluza-Klein gluon excitation in the Randall-Sundrum model) is mZ < 880 GeV (mgKK < 1130 GeV).

Original languageEnglish
Article number2083
JournalEuropean Physical Journal C
Volume72
Issue number7
DOIs
Publication statusPublished - Jul 26 2012

Fingerprint

Bosons
Protons
Detectors
collisions
protons
detectors
bosons
Colliding beam accelerators
center of mass
muons
Luminance
luminosity
quarks
Electrons
cross sections
excitation
electrons
Experiments
energy

All Science Journal Classification (ASJC) codes

  • Engineering (miscellaneous)
  • Physics and Astronomy (miscellaneous)

Cite this

A search for tt resonances with the ATLAS detector in 2.05 fb −1 of proton-proton collisions at √ s =7 TeV. / The ATLAS Collaboration.

In: European Physical Journal C, Vol. 72, No. 7, 2083, 26.07.2012.

Research output: Contribution to journalArticle

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abstract = "A search for top quark pair resonances in final states containing at least one electron or muon has been performed with the ATLAS experiment at the CERN Large Hadron Collider. The search uses a data sample corresponding to an integrated luminosity of 2.05 fb−1, which was recorded in 2011 at a proton-proton centre-of-mass energy of 7 TeV. No evidence for a resonance is found and limits are set on the production cross-section times branching ratio to tt for narrow and wide resonances. For narrow Z′ bosons, the observed 95 {\%} Bayesian credibility level limits range from 9.3 pb to 0.95 pb for masses in the range of mZ′ = 500 GeV to mZ ′= 1300 GeV. The corresponding excluded mass region for a leptophobic topcolour Z′ boson (Kaluza-Klein gluon excitation in the Randall-Sundrum model) is mZ < 880 GeV (mgKK < 1130 GeV).",
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