TY  - JOUR
T1  - A search for \(t\overline t\) resonances with the ATLAS detector in 2.05 fb\(^{−1}\) of proton-proton collisions at √s=7 TeV
JF  - European Physical Journal C
N2  - 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 \(t\overline t\) 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 m Z′=500 GeV to m\(_{Z′}\)=1300 GeV. The corresponding excluded mass region for a leptophobic topcolour Z′ boson (Kaluza-Klein gluon excitation in the Randall-Sundrum model) is m\(_{Z′}\)<880 GeV (m\(_{gKK}\)<1130 GeV).
KW  - dilepton invariant mass
KW  - dilepton channel
KW  - jet channel
KW  - top quark mass
KW  - heavy flavour quark
KW  - reconstructed mass spectrum
KW  - muon channel
KW  - single top production
KW  - electron energy deposition
KW  - multijet background
KW  - non-prompt lepton
KW  - light quark jet
KW  - jet sample
KW  - pair invariant mass
KW  - event selcetion cut
Y1  - 2012
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-127959
VL  - 72
IS  - 2083
ER  -