Testing ATLAS Z +MET excess with LHC Run 2

The atlas collaboration reported a 3σ excess in the search of events containing on-z dilepton, jets, and large missing momentum (met) in the 8 tev lhc run. motivated by this excess, many models of new physics have been proposed. recently, the atlas and cms collaborations reported new results for similar z+met channels in the 13 tev run. in this paper, we comprehensively discuss the consistency between the proposed models and the lhc results of run 1 and run 2. we find that in models with heavy gluino production, there is generically some tension between the 8 tev and 13 tev results. on the other hand, models with light squark production provide relatively better fitting to both results.