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We present a study of four top quark production at the LHC in the StandardModel Effective Field Theory (SMEFT). The analysis is performed at thetree-level, including all terms from the mixed QCD-EW-coupling cross-sectionexpansion and all the relevant dimension-six SMEFT operators. We find severalcases in which formally subleading terms give rise to significantcontributions. Moreover, we obtain limits on the SMEFT Wilson coefficients(WCs), including different collider setups, FCC-hh and HL-LHC, using asimplified chi-square fit. Through the latter, we also assessed the importanceof including differential information in the fit.

Complete study of four top quark production at the LHC in the SMEFT