Model Independent Search for Deviations from the Standard Model ...

112 Results and Interpretation
Anattemptcanbemadeatthispoint,furtherinvestigationsshouldclarifythisdiscrepancy
found by the Search Alsorithm. Again, only a distinct mis-measurement of the muon or
of the jet E T could lead to fake MET of this magnitude (≈ 200 GeV). As the selection
cuts for both objects (muons and jets) are very tight, a mis-measurement of this amount is
very unlikely and thus worrying. The Monte Carlo simulation should model these quality
selection cuts properly.
events / 5 GeV
10
1
Event Class: 1ν1µ2j+X
p = 0.001
~
P = 0.14
-1
10
-2
10
events / 5 GeV
10
1
Event Class: 1ν1µ2j+X
460 480 500 520 540 560 580 600
sum of p T
[GeV]
-5
p = 1×10
~
P = 0.006
events / 5 GeV
10
1
Event Class: 1ν1µ2j
-6
p = 5×10
~
P < 0.001
-1
10
-1
10
-2
10
-2
10
160 180 200 220 240 260 280 300 320 340
MET [GeV]
160 180 200 220 240 260 280 300 320 340
MET [GeV]
Figure 9.6: Results of the Search Algorithm in the 1ν 1µ 2j(+X) inclusive and exclusive event
classes.
1ν 1µ 1e 2j(+X) inclusive and exclusive event class:
Inthiseventclassbothinclusivedistributionsandtheexclusive MET distributionshowan
data excess of three events in a narrow region (≈ 30 GeV), illustrated in Figure 9.7. This
excess is very interesting as t¯t → 2l 2jets is the most important contributor in this exotic
event class. Next to this, QCD is the only Standard Model process able to produce such a
combinationofparticles. SUSYparticlesarealsoexpectedtoproduceleptoncombinations
with unlike avour, i.e. electron and muon, so this event class is promising for the search
for New Physics. The p-values of these three distributions are all very low (p < 0.005) ,
but only the inclusive sum of p T distribution is below the three sigma line. All General