6533b857fe1ef96bd12b380f
RESEARCH PRODUCT
A search for t (t)over-bar resonances with the ATLAS detector in 2.05 fb(-1) of proton-proton collisions at root s=7 TeV
Atlas CollaborationVasiliki MitsouJuan A. Fuster VerdúAntonio Ferrer SoriaSusana Cabrera UrbánCarmen García GarcíaMaría Victoria Castillo GiménezEmilio Higón RodríguezSalvador Martí GarcíaEduardo Ros MartínezSantiago González De La HozJosé Salt CairolsJuan Antonio Valls FerrerMohammed KaciLuca FioriniYesenia Hernández JiménezCarlos Lacasta LlácerMiguel Villaplana Pérezsubject
Acceleradors de partículesHigh Energy Physics::ExperimentFísica nuclearNuclear ExperimentPartícules (Física nuclear)description
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 (t) over bar 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).
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2012-01-01 |