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

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62 Section 2: CDF Physics Analysis Table 6: source of error W ! e W ! statistics 65 100 energy scale M Z E=p M Z M 75 80 85 20 P W T & recoil model 40 40 parton distribution functions 15 15 higher order QED corrections 20 10 energy resolution 25 20 trigger & selection bias { 15+10 backgrounds 5 25 total systematic (w/o scale) 54 57 total uncertainty 113 117 143 117 Uncertainties in the W mass measurement, in MeV. \Energy" refers to the calorimeter measurement for electrons, and to the track momentum measurement for muons. In the electron channel the scale is being set by the Z mass and so the total uncertainty is 113 MeV
Section 2: Z Decays to bb 63 2.3.4 Study of the decay Z ! bb (Dr. Dorigo) While decays of Z bosons to b-quark pairs have been studied for some years at LEP and SLC, they have never been observed in pp collisions. The extraction of a signal in Run I data is therefore interesting. The knowledge gained will prove invaluable for designing advanced dedicated triggers for Run II. These events would help calibrate the absolute energy scale for b-quark jets, substantially reducing one of the critical sources of systematic uncertainty in the top quark mass measurement. CDF PRELIMINARY Events per 10 GeV/c 2 120 Selected Sample 100 — Unbinned Likelihood Fit 80 – – Background 60 … Z → bb Signal 40 20 0 0 20 40 60 80 100 120 140 160 180 200 Dijet Invariant Mass (GeV/c 2 ) Events per 10 GeV/c 2 5000 4000 3000 2000 1000 Background Sample — Unbinned Likelihood Fit 0 0 20 40 60 80 100 120 140 160 180 200 Dijet Invariant Mass (GeV/c 2 ) Figure 32: Top: the Z peak in the signal sample; bottom: a signal-depleted sample is used to extract the background shape. Dorigo extracted a signal for Z ! b b signal using kinematic tools and b-quark tagging for his Ph.D. thesis with Padova University (see Fig. 32). Starting from a dataset of about ve
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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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