To simply study the impact of hot tower on the jet finding, I pick up 50 runs ( 0.6M events)  to see the difference of the jet and W yields before and after masking out the towers.

Belo plots show the differences of the eta-phi distribution and pt distribution of the reconstructed jets. 

Below plot shows the comparison of the events counting distribution for W reconstruction step by step.  The reconstructed jets are used for background rejection.  The jet distribution and their pT will impact the sign-pT balance. In below plot, the bin "noAway" shows the count after the sign-Pt balance cuts,  ONE events different between before and after the masking.