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2 Long Lived Particle Searches

A search for pair production of vector-like quarks, both up-type (T) and down-type (B), as well as for four-top-quark production (see Figure 3), was presented [5]. Data were analysed in the lepton-plus-jets final state, characterised by an isolated electron or muon with high transverse momentum, large missing transverse momentum and multiple jets. Dedicated analyses were performed targeting three cases: a T quark with significant branching ratio to a W boson and a b-quark (TT →Wb + X), and both a T quark and a B quark with significant branching ratio to a Higgs boson and a third-generation quark (TT → Ht+X and BB→ Hb + X respectively (see Figure 4 for examples)). No significant excess of events above the Standard Model expectation was observed, and 95% CL lower limits were derived on the masses of the vector-like T and B quarks under several branching ratio hypotheses assuming contributions from T → Wb, Zt, Ht