A search for resonance in the lepton plus jets channel with ATLAS using 14 fb−1 of proton-proton collisions at √s = 8 TeV
LPSC, Université Joseph Fourier Grenoble 1, CNRS/IN2P3, Institut Polytechnique de Grenoble 53, rue des Martyrs 38026 Grenoble Cedex, France
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Published online: 26 November 2013
The search for resonances allows the investigation of a wide range of physics beyond the Standard Model. For a high mass resonance, the top quark is produced with a transverse momentum that is large, compared to its mass, and the decay of such a highly boosted top often leads to a topology that differs in several respects from that encountered when the top quarks are produced approximately at rest. The search is performed with the ATLAS experiment at the LHC using an integrated luminosity of 14 fb−1 of proton-proton collisions data collected at center-of-mass energy √s = 8 TeV. No evidence for a resonance is found and 95% CL limits on the production rate are determined for massive states in two benchmark models. A narrow leptophobic topcolor Z’ boson with a mass below 1.8 TeV is excluded and a Kaluza-Klein excitation of the gluon in a Randall-Sundrum model is excluded for masses below 2.0 TeV.
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