[@Cacciari:2011ma]. The jet energies are corrected to account for the contribution from pileup interactions and to compensate for variations in the detector response [@Cacciari:2011ma; @pileup]. To mitigate issues related to noise in the ECAL endcaps that led to significantly worse modeling of the distribution, particularly for events with large values of in 2017 data, PF candidates that are clustered in jets in $2.65 < \abs{\eta} < 3.14$ with uncorrected $\pt<50\GeV$ are not used in the calculation of in 2017 data and simulation. Disagreements between the distributions in data and simulation ranging up to $>$100% for $50 < \ptmiss < 170\GeV$ in DY+jets events, in which large values of arise mainly from mismeasurements, are reduced by this modification of the calculation. The modified distributions in simulated events and data agree within uncertainties.

Jets in the search are required to have their axes within the tracker volume of $\abs{\eta} < 2.4$. For the [$\tauh\tauh$]{}analysis, we use jets with $\pt>30\GeV$, while for the [$\ell\tauh$]{}analyses, we veto events containing jets with $\pt>20$to provide efficient background rejection. Jets are required to be separated in $\eta$ and azimuthal angle ($\phi$) by ${\ensuremath{\Delta R}\xspace}\equiv \sqrt{\smash[b]{(\Delta\eta)^2 + (\Delta\phi)^2} } > 0.4$ from electron, muon, or candidates in order 