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    Rights statement: ©2016 The Author. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). Funded by SCOAP3.

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Search for single production of a vector-like quark via a heavy gluon in the 4b final state with the ATLAS detector in pp collisions at √s= 8 TeV

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  • ATLAS Collaboration
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<mark>Journal publication date</mark>10/07/2016
<mark>Journal</mark>Physics Letters B
Volume758
Number of pages20
Pages (from-to)249-268
<mark>State</mark>Published
<mark>Original language</mark>English

Abstract

A search is performed for the process pp →G∗→BH¯b/¯BHb →Hb¯b→b¯bb¯b, predicted in composite Higgs scenarios, where G∗ is a heavy colour octet vector resonance and BH a vector-like quark of charge −1/3. The data were obtained from pp collisions at a centre-of-mass energy of 8 TeV corresponding to an integrated luminosity of 19.5 fb−1, recorded by the ATLAS detector at the LHC. The largest background, multijet production, is estimated using a data-driven method. No significant excess of events with respect to Standard Model predictions is observed, and upper limits on the production cross section times branching ratio are set. Comparisons to the predictions from a specific benchmark model are made, resulting in lower mass limits in the two-dimensional mass plane of mG∗ vs. mBH.