Triple-Top Signal of New Physics at the LHC arXiv:1001.0221v3 [hep-ph] 1 Dec 2010 $^{1}$Department of Physics, Vernon Barger $^{1}$, Wai-Yee Keung$^{2}$, Brian Yencho1 University of Wisconsin, Madison, WI 53706 $^{2}$Department of Physics, University of Illinois, Chicago, IL 60607 Abstract We present leading-order (LO) cross sections for the production of three top quarks ( tt ¯ t , t ¯ t t ) at the Large Hadron Collider (LHC). We find a total LO cross section for triple-top production in the Standard Model of σ ≈ 2 fb at √ s = 14 TeV and we give examples of two new physics models which have a significant enhancement to this channel. In the Minimal Supersymmetric Standard Model (MSSM), there are regions of parameter space where the decays of gluino pairs into final states including three tops has a cross section σ ≈ 41 fb. In a leptophobic Z ′ model featuring right-handed couplings of the u -quark to the top, we find σ ≈ 28 fb. With efficient identification and reconstruction of the top quarks, the triple-top signal could potentially provide evidence for new physics at the LHC. 1