A search for ttbar resonances with the ATLAS detector in 2.05 fb^-1 of proton-proton collisions at sqrt(s) = 7 TeV

ATLAS Collaboration, Wahid Bhimji, Philip Clark, Robert Harrington, Victoria Martin

Research output: Contribution to journalArticlepeer-review

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 ttbar for narrow and wide resonances. For narrow Z' bosons, the observed 95% 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_{g_KK} <1130 GeV).
Original languageEnglish
Pages (from-to)2083
Number of pages2083
JournalEuropean Physical Journal C
VolumeC72
DOIs
Publication statusPublished - 2012

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