{T}}^{\text {miss}} $) in proton-proton collisions, at a center-of-mass energy of 13 TeV. This is
a challenging task involving many detector inputs, combining fully calibrated electrons,
muons, photons, hadronically decaying $\tau $-leptons, hadronic jets, and soft activity from
remaining tracks. Possible double counting of momentum is avoided by applying a signal
ambiguity resolution procedure which rejects detector inputs that have already been used …