Four top quarks and the t(t)over-bar forward-backward asymmetry

New color octet vectors below the TeV scale could explain the anomalous t (t) over bar forward-backward asymmetry observed at the Tevatron experiments, while being consistent with the current LHC data. These models generally lead to four-top final states at the LHC at observable levels. We compute the four-top production cross section at the LHC in a model with a massive color octet vector as a function its mass, its width, and its coupling to the top quark. Octet masses in the vicinity of the t (t) over bar threshold are generally excluded by present limits on the production of same-sign dileptons and trileptons. Masses above 650 GeV are allowed, quite independently of the couplings, but they can be probed with the luminosity of 5 fb(-1) already collected at the LHC, up to around 800 GeV. The four-top production cross section is increased by a factor similar to 2 with root s = 8 TeV and by up to almost 2 orders of magnitude with root s = 14 TeV, thus greatly increasing the reach for massive gluons after the LHC energy upgrade.