One important part of a W' search is to have a correct determination of the MET in the event. This MET is supposed to relate to the undetectable nuetrino in the event. Three different sources of MET are investigated for use in this W' search.

• recoMETs_htMetIC5 (Calo Towers) : AOD object which should sum over all jets in event (using iterative cone 5 jets)
• recoCaloMETs_metOpt (Jets) : AOD object which finds missing energy from Calo towers, with optimized threshold
• Personal : By hand summing over all jets in the events (using iterative cone 5 jets)

All of these MET objects then have the muon's energy added to them before creating a final MET object. How well the MET objects match the nuetrino is determined by both the magnitude and direction of the MET. Both are necessary to obtain an accurate transverse mass.

• Measured MET minus nuetrino Pt for different MET sources:
  

MET source	RMS
Calo Towers	29.51
Jets	27.51
Personal	29.08

• MET phi minus nuetrino phi for different MET sources:
  

MET source	RMS
Calo Towers	0.09993
Jets	0.09173
Personal	0.09947

All three methods give roughly equal performance. The jets algorithm is used for analysis in W'.