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Aad, G.; Abbott, B.; Adomeit, Stefanie; Becker, S.; Biebel, Otmar
(2016):
Search for the production of single vector-like and excited quarks in the Wt final state in pp collisions at root s=8 TeV with the ATLAS detector.
In: Journal of High Energy Physics, Nr. 2, 10
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![[img]](https://epub.ub.uni-muenchen.de/38054/1.hassmallThumbnailVersion/10.1007_JHEP02%282016%29110.pdf)  Vorschau |
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Abstract
A search for vector-like quarks and excited quarks in events containing a top quark and a W boson in the final state is reported here. The search is based on 20.3 fb(-1) of proton-proton collision data taken at the LHC at a centre-of-mass energy of 8 TeV recorded by the ATLAS detector. Events with one or two leptons, and one, two or three jets are selected with the additional requirement that at least one jet contains a b-quark. Single-lepton events are also required to contain at least one large-radius jet from the hadronic decay of a high-PT W boson or a top quark. No significant excess over the expected background is observed and upper limits on the cross-section times branching ratio for different vector-like quark and excited-quark model masses are derived. For the excited-quark production and decay to Wt with unit couplings, quarks with masses below 1500 GeV are excluded and coupling-dependent limits are set.
