2 The CDF Experiment at Fermilab Contents - Harvard University ...
2 The CDF Experiment at Fermilab Contents - Harvard University ...
2 The CDF Experiment at Fermilab Contents - Harvard University ...
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Section 2: Supersymmetry 43<br />
Figure 21: detector - event z vertex plane for the second jet and 6 E T<br />
- 2nd jet plane.<br />
We use the Z resonance d<strong>at</strong>a because there is little background under the Z peak in<br />
the <strong>CDF</strong> d<strong>at</strong>a. <strong>The</strong> shape of the kinem<strong>at</strong>ic distributions (P T of the boson, jet E T , jet<br />
, 6E T , as well as other event topology rel<strong>at</strong>ed variables) in the Monte Carlo are in good<br />
agreement with the shapes observed in the d<strong>at</strong>a. To use the same normaliz<strong>at</strong>ion scheme in<br />
the W plus jets processes (i.e. using the Z d<strong>at</strong>a) we examine the r<strong>at</strong>io of the<br />
in the d<strong>at</strong>a. Figure<br />
W !e+2 jets<br />
Z!ee+2 jets<br />
22 shows the raw r<strong>at</strong>io in the d<strong>at</strong>a and the r<strong>at</strong>io after applying the<br />
Acceptance(A) efficiency() for the selection of the Zs and the Ws.<br />
Also we use lepton universality, namely the r<strong>at</strong>io of<br />
W !e+2 jets<br />
W !+2 jets<br />
to valid<strong>at</strong>e the normaliz<strong>at</strong>ion<br />
scheme in the W ! + 2 jets QCD predictions. Fig. 23 shows this r<strong>at</strong>io in the<br />
raw d<strong>at</strong>a and after the Acceptance(A) efficiency() applied.
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