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Abstract
This talk highlights the latest results of heavy quark searches from the ATLAS collaboration, mainly on resonance searches and vector-like quarks (VLQs) searches. Searches for it resonances using lepton-plus-jets events in proton-proton collisions at center-of-mass energy of 8 and 13 TeV are presented. Limits are set for BSM particles such as topcolor-assisted technicolor Z'TC, Kaluza-Klein (K-K) gluons gKK and K-K excitations of graviton GKK in the Randall-Sundrum model of extra dimensions. VLQs arise naturally in many models such as Little Higgs and Composite Higgs and typically couple preferably to the third generation SM quarks and weak bosons. Limits are set for vector-like bottom (B) and top (T) quarks decay to lepton-plus-jets final states via Hb+X and Ht+X channels in two analyses using 8 and 13 TeV datasets from ATLAS.
Highlights
There are two main categories of heavy quark searches at ATLAS [1]
The following sections focus on the two ttresonance searches using the lepton-plus-jet final state
The topcolor-assisted technicolor Z has been excluded from 0.7 TeV to 2.7 TeV at 95% confidence level (CL) and the corresponding limit plot is shown in figure 6
Summary
There are two main categories of heavy quark searches at ATLAS [1]. Firstly, there are modelagnostic searches in which we look for resonances such as X → tt, tb or single t+ETmiss. ATLAS has several searches for resonances with different final states. TeV, there is a ttresonance search using the lepton-plus-jet final state looking for Z [5].
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