Measurement of the Z boson cross-section in - Harvard University ...

Chapter 6: Event Selection 176
Fraction of events
Number of vertices In data In simulation Event weight
0 - - 1
1 0.5848 0.1538 3.8027
2 0.3032 0.2956 1.0260
3 0.0907 0.2773 0.3270
4 0.01729 0.1666 0.1038
5 0.00374 0.0726 0.0514
6 0.000192 0.0250 0.0077
7 0.000048 0.00709 0.00675
8 0. 0.00165 0.
9 0. 0.00034 0.
Table 6.2: Fraction of events with N vertices in Monte Carlo and data for N =1− 9.
The last column shows the weights that we use to correct the Monte Carlo. The
weight for the 0-vertex case is set to 1, since the fraction of events in data without a
reconstructed vertex is negligibly small.
Selection Number of events Relative eff. Absolute eff.
Total Events 299249 - -
L1 MU6 256943 85.9% 85.9%
Vertex 256422 99.8% 85.7%
High pT muon 232787 90.8% 77.8%
2 combined muons 142226 61.1% 47.5%
|η| < 2.4 135505 95.3% 45.3%
pT >20 GeV, MS pT >10 GeV, 116938 86.3% 39.1%
dpT