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

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68 Section 2: CDF Physics Analysis Figure 33: The pp ! WW cross section measured by CDF at 1:8 TeV compared to theory predictions. W + production. Another interesting diboson process is W production. CDF has measured the cross section of this process using the leptonic decay mode of the W [19], but no serious eort has been made in the more challenging hadronic channel. Here the data sample is the high E T photon sample, and the primary backgrounds are + 2 jet production and fake photons from neutral hadrons. Hall and Dorigo have begun looking at the Run I data to determine if it is feasible to observe W 's in this sample. If a signal is found its peak position can be used to set the energy scale for the calorimetry. Also any experience we can gain with hadronic W decays will be useful in other related analyses. Trileptons, and Same-Sign Dileptons. The appearance of WW and WZ events in purely leptonic nal states is interesting, too. Schmitt identied events with three leptons (`trileptons') or two leptons with the same sign (`same-sign dileptons') as sensitivechannels for higgs bosons of intermediate mass (M h > 135 GeV). This comes about through pp ! Wh followed by h ! WW () , which dominates for M h > 135 GeV. If all three W 's decay to leptons, then a very clean topology results. (This topology has been studied already in the context of a search for associated chargino and neutralino production.) Schmitt has developed an eective set of selection criteria. Some examples of his cuts are shown in Fig. 34 A second clean topology arises when the two W 's with the same charge decay leptonically with the third decaying hadronically. This topology is called the `same-sign dilepton' topology, and due to the higher rate, is more powerful than the trilepton topology. Schmitt
Section 2: Di-Boson Production 69 completed feasibility studies which showed that the reach of the TeVatron for higgs searches could be signicantly increased [17] on the basis of these channels. His results have been used to derive luminosity requirements as a function of the Higgs mass, shown in Fig. 35. The main backgrounds for the intermediate mass higgs search are WW and WZ production, so a measurement of the rate and a study of the kinematic properties is extremely important. Since the decays of W and Z bosons are well know, signals in these channels would provide a powerful check on the study of the hadronic samples described above.
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1 2 The CDF Experiment at Fermilab
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Section 2: CDF 3 of Run I data. Rec
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