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A search is performed for the process $pp \to G^* \to B_H\bar b/\bar B_H b\to H b \bar b \to b\bar bb\bar b$, predicted in composite Higgs scenarios,where $G^*$ is a heavy colour octet vector resonance and $B_H$ a vector-likequark of charge $-1/3$. The data were obtained from $pp$ collisions at acentre-of-mass energy of 8 TeV corresponding to an integrated luminosity of19.5 fb$^{-1}$, recorded by the ATLAS detector at the LHC. The largestbackground, multijet production, is estimated using a data-driven method. Nosignificant excess of events with respect to Standard Model predictions isobserved, and upper limits on the production cross section times branchingratio are set. Comparisons to the predictions from a specific benchmark modelare made, resulting in lower mass limits in the two-dimensional mass plane of$m_{G^*}$ vs. $m_{B_H}$.

physics letters b

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 $\sqrt{s}  = 8$ TeV