Performance of the missing transverse momentum triggers for the ATLAS detector during Run-2 data taking
The factor of four increase in the LHC luminosity, from 0.5 × 1034 cm−2s−1 to 2.0 × 1034cm−2s−1, and the corresponding increase in pile-up collisions during the 2015–2018 data-taking period, presented a challenge for the ATLAS trigger, particularly for thosealgorithms that select events with missing transverse momentum.