SEARCHES FOR RARE TOP QUARK DECAY AND BSM TOP INTERACTIONS

Run 2 of the LHC has witnessed the observation of many rare top quark production processes predicted by the Standard Model and has boosted searches for flavour- changing-neutral-current interactions of the top quark, that are heavily suppressed in the SM. In this contribution the highlights are shown of searches by the ATLAS experiment for rare FCNC top quark decays that are suppressed in the SM and BMS processes involving top quarks. Results are presented of searches for flavour-changing-neutral-current processes involving top quarks. Searches in the full run 2 data set have been performed for tqg, tqgamma, tqZ and tqH interactions, with bounds exceeding previous limits by large factors.