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We repurpose the recent ATLAS search for same-sign top quarks in data with1.0 fb$^{-1}$ in the context of a search for production of four top quarks.Using the null results of that search, we place limits on the four-top-quarkproduction cross section of about 1 pb. These limits are larger than theexpected Standard Model rate for four-top-quark production, but are alreadystrong enough to place interesting constraints on models which enhance thatrate. We interpret these results in the context of models in which theright-handed top quark is composite and find limits on the compositeness scaleof about 700 GeV.

Limits on Four-Top Production from the ATLAS Same-sign Top-quark Search