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

Barton, Adam Edward and Beattie, Michael and Borissov, Guennadi and Bouhova-Thacker, Evelina Vassileva and Cheatham, Susan and Dearnaley, William and Fox, Harald and Grimm, Kathryn Ann Tschann and Henderson, Robert Charles William and Hughes, Gareth and Jones, Roger William Lewis and Kartvelishvili, Vakhtang and Long, Robin Eamonn and Love, Peter Allan and Muenstermann, Daniel Matthias Alfred and Skinner, Malcolm and Smizanska, Maria and Walder, James William and Wharton, Andy (2016) 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. Physics Letters B, 758. pp. 249-268. ISSN 0370-2693

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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.

Item Type: Journal Article
Journal or Publication Title: Physics Letters B
Uncontrolled Keywords: /dk/atira/pure/subjectarea/asjc/3100/3106
Subjects:
Departments: Faculty of Science and Technology > Physics
ID Code: 79722
Deposited By: ep_importer_pure
Deposited On: 24 May 2016 08:46
Refereed?: Yes
Published?: Published
Last Modified: 18 Oct 2019 00:42
URI: https://eprints.lancs.ac.uk/id/eprint/79722

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