Expected performance of missing transverse momentum reconstruction for the ATLAS detector at $\sqrt{s}= 13~\text{TeV}$

This document summarises the expected performance of the missing transverse momentum reconstruction for early Run 2 data in the ATLAS detector. The performance of the missing transverse momentum reconstruction is evaluated using Monte Carlo simulations of proton-proton collisions at a centre-of-mass energy of 13 TeV. Different missing transverse momentum definitions using calorimeter energy deposits and tracks reconstructed by the ATLAS Inner Detector are compared in a variety of event topologies. Estimates of the systematic uncertainty on measurements of ETmiss are described.