Some N-1 plots from the electron sample when using the cuts Hajrah suggested on Thursday. The signal over sqrt(signal+background) is overlaid, with the "star" series showing the s/sqrt(s+b) if you take everything to the right of it and the "dot" everything to the left. Both s/sqrt(s+b) use the right axis while the histograms use the left. It should make sense if you look at the plots.
Di-electron mass
Di-jet mass
Recoil mass
cos(theta) of the Z
I didn't bother with a plot for "number of electrons" because it doesn't show anything.
It looks like the lower di-electron mass could go up a bit, everything else looks spot on. I'm not suggesting we should necessarily change it, keeping the muon and electron channel cuts is probably more important for now and the likelihood cut should take up the slack. As Roberval mentioned though, the 2 fermion background might require us to tighten the di-lepton mass cut.
For reference here are the cuts:
number of electrons >= 2
70 < di-electron mass < 110
100 < di-jet mass < 140
cos(theta) of the Z candidate < 0.9
117 < recoil mass < 150
1 comment:
I have checked 4fermion events but there is not a single entry coming after the cuts. For 2 fermions I will hopefully be able to get samples in some days so will be able to find how many are passing the cuts. But i suspect that they will not be many or may be 0.
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