$E_{\text{T}}^{\text{miss}}$ performance in the ATLAS detector using 2015-2016 LHC p-p collisions

The reconstruction and calibration algorithms used to measure missing transverse momentum ($E_{\text{T}}^{\text{miss}}$) with the ATLAS detector utilise energy deposits within the calorimeter and tracks reconstructed in the inner detector and the muon spectrometer. The performance of the $E_{\text{T}}^{\text{miss}}$ reconstruction algorithms is evaluated using data collected in proton--proton collisions in 2015 and 2016 at a centre-of-mass energy of $13$ TeV. Results are shown for a data sample corresponding to an integrated luminosity of $36~$fb$^{-1}$. The performance of $E_{\text{T}}^{\text{miss}}$ built with jets reconstructed using a particle flow algorithm is presented and compared to that built with calorimeter jets. Various strategies are used to suppress effects arising from additional proton--proton interactions, called pileup. The tracking and vertexing information is used to distinguish contributions from pileup entering the $E_{\text{T}}^{\text{miss}}$ calculation. The modelling of $E_{\text{T}}^{\text{miss}}$ in simulated events containing a $Z$ boson decaying to two charged leptons (electrons or muons) is compared to data, and estimates of the systematic uncertainties in the $E_{\text{T}}^{\text{miss}}$ measurements are presented.