J. A. Aguilar-Saavedra, Jose Santiago
New colour octet vectors below the TeV scale could explain the anomalous t
tbar 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 colour octet
vector as a function its mass, its width and its coupling to the top quark.
Octet masses in the vicinity of the t tbar 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
~ 2 with sqrt{s}=8 TeV and by up to almost two orders of magnitude with
sqrt{s}=14 TeV, thus greatly increasing the reach for massive gluons after the
LHC energy upgrade.
View original:
http://arxiv.org/abs/1112.3778
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