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

ATLAS Collaboration

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Abstract

A search is performed for the process ppG BHb¯/B¯HbHbb¯ → bbbb¯, predicted in composite Higgs scenarios, where Gis 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-ofmass 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.
Original languageEnglish
Pages (from-to)249–268
JournalPhysics Letters B
Volume758
Early online date3 May 2016
DOIs
Publication statusPublished - 10 Jul 2016

Bibliographical note

36 pages, 4 figures, 5 tables, submitted to PLB, All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/EXOT-2014-19

Keywords

  • hep-ex

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