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 √s̅ = 8 TeV

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Abstract

A search is performed for the process pp → G* → B_{H}b̅ / B̅_{H}b → Hbb̅ → bb̅bb̅ predicted in composite Higgs scenarios, where G* is a heavy colour octet vector resonance and B_{H} 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 m_{G*} vs. m_B_.H.

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Keywords

Proton-proton interactions, Quarks, Large Hadron Collider (France and Switzerland), Standard Model, Jets (Nuclear physics), Branching ratios (Nuclear physics)

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Rights

CC BY 4.0 (Attribution), ©2016 The Authors

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