Speaker
Description
Many theories beyond the Standard Model predict new phenomena, such as $Z'$ and vector-like quarks, in final states containing bottom- or top-quarks. It is challenging to reconstruct and identify the decay products and model the major backgrounds. Nevertheless, such final states offer great potential to reduce the Standard Model backgrounds due to their characteristic decay signature. The latest search in the two quark final states using the full Run-2 ( $139$ fb$^{−1}$) proton-proton collision data collected at a center-of-mass energy of $\sqrt{s} = 13$ TeV with the ATLAS detector will be presented. In particular, this presentation will summarize the recent results of dijet and top-antitop resonance searches in the hadronic top-quark final state. This talk will also highlight associated improvements coming from deep learning-based $b$-quark and top-quark identification techniques. Furthermore, the interpretations of these results in the context of $s$-channel dark matter mediator models will be discussed.
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