2 The CDF Experiment at Fermilab Contents - Harvard University ...

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40 Section 2: CDF Physics Analysis Figure 19: 6E T ditributions (I) online trigger sample (II) after rst stage cleanup requirements applied (III) after second stage cleanup requirements applied.
Section 2: Supersymmetry 41 multijet event. We developed a `tomographic' cleanup algorithm to reject the events with the second most energetic jet pointing to a crack and being collinear with the missing energy vector. We refer to this procedure as \jet verication" and it is a a crucial element for improving the reach of this analysis. In the diagram of Fig. 20 a side view of quarter of the detector is drawn and the cracks where the jets might escape detection are shown. One expects in the case of jets being lost in the cracks the events to be distributed in the vs zvertex plane as shown in the bottom diagram of Fig. 20. Indeed in Fig. 21 we see this behavior in the data where the second jet falls in a detector boundary and the 6E T is collinear with the second jet. We reject the events that fall in the high density stripes on both the 2nd jet detector -event z vertex plane and the 6 E T - 2nd jet (in radians) plane. The following requirements are designed to have good W/Z/top background rejection eciency, they make use of the kinematic and topological characteristics of the SUSY signal and eliminate residual QCD mismeasurements: at least 3 jets 6E T 60 GeV 2nd jet H T = ET 3rd jet + ET + 6E T : :200 GeV . None of the two leading jets should be purely electromagnetic No azimuthal correlation between the direction of the rst two jets and the 6E T . After this selection the signal eciency for a high squark gluino mass point in the SUSY parameter space is 15%. This signies an improvement over the Run Ia CDF seach (eciency in the range of 1-5%) and over the Run Ib D0 search (in the range 1-10%). W, Z Background Normalization In order to get a precise estimate of the W/Z QCD associated background with a neglidgable systematic dependance on the renormalization and factorization scale we normalize the Monte Carlo prediction for Z ! + 3 jets and W ! + 2 jets rates using the data rates of Z ! e + e , + 2 jets.
Page 1 and 2: 1 2 The CDF Experiment at Fermilab
Page 3 and 4: Section 2: CDF 3 of Run I data. Rec
Page 5 and 6: Section 2: CDF Hardware Projects 5
Page 7 and 8: Section 2: Central Outer Tracker 7
Page 21 and 22: Section 2: DAQ for the Silicon Vert
Page 27 and 28: Section 2: Central Muon Extension 2
Page 33: Section 2: Central Muon Extension 3
Page 36 and 37: 36 Section 2: CDF 2.3 Run I Physics
Page 38 and 39: 38 Section 2: CDF Physics Analysis
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90 Section 2: CDF Physics Analysis
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Section 2: B Mixing and CP Violatio
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Section 2: B Mixing and CP Violatio
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Section 2: CDF 97 multijet trigger
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Section 2: CDF 99 The Jet Pseudora
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Section 2: CDF 101 while the proble
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Section 2: CDF 103 Talks at Confere
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Section 2: CDF 105 References [1] T
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