If time allows I will think of a smart way to perform the background separation using the information from the plot below. But the idea is there.
Wednesday, August 20, 2008
Neutrino effect on dijet mass
I still did not cross check the effect of neutrinos in the dijet mass yet. In confirming so, we can take advantage of that to separate the ZH events from the ZZ background. The ZH events for dijet mass values below about 110 GeV should have more missing energy than the ZZ events with dijet mass above about 92 GeV. This range, 92 < dijet mass < 110, contains most of the overlapping between the two processes. Then instead of cutting on the dijet mass at 96 GeV we cut on the missing ET-dijet mass plane. By just applying the cut, obtained "by eye", shown in the plot 10% of the signal was recovered whereas 10% more background events were cut when compared with the case where just a dijet mass cut is applied (see previous post).
If time allows I will think of a smart way to perform the background separation using the information from the plot below. But the idea is there.
If time allows I will think of a smart way to perform the background separation using the information from the plot below. But the idea is there.
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2 comments:
The thing that worries me about the neutrinos is not the overall selection efficiency but the bias in Higgs decay modes - heavy flavour jets have more neutrinos than gluon jets so H->bb is more likely to fail the dijet mass cut.
Joel, thanks for the comment. I did not think of that. You are right. And similarly for H->cc, but with the problem of low branching ratio.
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