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The factor of four increase in the LHC luminosity, from $0.5\times10^{34}\,\textrm{cm}^{-2}\textrm{s}^{-1}$ to $2.0\times10^{34}\textrm{cm}^{-2}\textrm{s}^{-1}$, and the corresponding increase inpile-up collisions during the 2015-2018 data-taking period, presented achallenge for ATLAS to trigger on missing transverse momentum. The output datarate at fixed threshold typically increases exponentially with the number ofpile-up collisions, so the legacy algorithms from previous LHC data-takingperiods had to be tuned and new approaches developed to maintain the hightrigger efficiency achieved in earlier operations. A study of the triggerperformance and comparisons with simulations show that these changes resultedin event selection efficiencies of >98% for this period, meeting and in somecases exceeding the performance of similar triggers in earlier run periods,while at the same time keeping the necessary bandwidth within acceptablelimits.

Performance of the missing transverse momentum triggers for the ATLAS detector during Run-2 data taking