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A 3 sigma excess has been recently announced by ATLAS in events with Z-peakeddilepton pairs, jets, and large transverse missing energy. We interpret thisfinding in the context of composite Higgs / RS theories. We find that compositeHiggs theories with custodial symmetry protection to the $Zb\bar{b}$ couplingpredict a significant contribution to $ZZbb$ (and to $hhbb$) final statescoming from heavy gluon decays to pairs of bottom-partner vector-like quarks.The heavy gluon to vector-like quarks signal is largely accepted by the ATLASselection if one of the $Z$ boson in the $ZZbb$ final state decays leptonicallyand the other to neutrinos. For a bottom partner of $\sim$900 GeV, we find thatthe ATLAS excess can be reproduced by composite Higgs models, in anexperimentally allowed parameter space, for heavy gluon masses roughly in arange 1.87 - 2.15 TeV and for heavy gluon couplings to light quarks within$\sim(0.3-0.65) g_S$. We briefly discuss the implication of this result forfuture experimental tests.

Z-peaked excess from heavy gluon decays to vector-like quarks