Abstract
We explore the four top signal $ t\bar{t}t\bar{t} $ at the 7TeV Large Hadron Collider as a probe of physics beyond the standard model. Enhancement of the corresponding cross-section with respect to the Standard Model value can probe the electroweak symmetry breaking sector or test extra dimensional models with heavy Kaluza-Klein gluons and quarks. We perform a detailed analysis including background and detector simulation in the specific case of a universal extra-dimensional model with two extra dimensions compactified using the geometry of the real projective plane. For masses around 600 GeV, a discovery is possible for an effective cross section above 210 fb (36 fb) for 1/fb (10/fb) of integrated luminosity. This implies a branching ratio in tops of the (1, 1) heavy photon above 13% (5%). Furthermore, the 4-top signal from the (2, 0) and (0, 2) tiers can be discovered with an integrated luminosity of 3.5/fb. The results of our simulation can be easily adapted to other models since the background processes are identical. Concerning the signal, typical production mechanisms for the $ t\bar{t}t\bar{t} $ signal are similar even if cross-section values may vary considerably depending on the model and the spectrum of the new particles.
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