first physics run. The left plots in Fig. \[fig:signalMETplots\] show that the same energy-dependent timing window used in Section \[sec:bkgdtiming\] preserves MET distributions for simulated SUSY events with high efficiency.

The impact of the timing filter for QCD dijet events was also studied. The QCD dijet process was generated by Pythia for a range of hard scattering scales $15\GeVc < \hat{p}_T < 3\TeVc$ with same center-of-mass and luminosity assumptions as the SUSY sample. While these events have no inherent MET, mismeasurements and dead material will result in the reconstruction of some MET in these events, particularly for events with large total transverse energy. The results for the QCD dijet sample are shown in the right column of Fig. \[fig:signalMETplots\] and indicate that the MET distribution is maintained by the filtering process. It is important to note that this filter is not intended to remove QCD backgrounds, which are inherently in-time. The point of the comparison is to verify that an increase in MET is not inadvertently created by the filtering process.

In order to apply the time filter to analysis of physics processes, actual performance of the filter will have to be rederived on collision data using processes such as 