CDF Blessed Top Group Results and Plots for Winter 2003 |
ttbar cross section measurement in the dilepton channel (e,mu) |
| Caption | Thumbnails | Caption | Thumbnails |
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| Dphi vs Met distribution of the dilepton data events (symbols) overlapped with the distribution from tt MC dilepton events (yellow dots). The plot is done for events with two isolated leptons, outside the Z mass range ( for ee and mmumu) and with two or more jets (Et>10 GeV, |eta|<2). | |
Dphi vs Met distribution of the dilepton data events (symbols) overlapped with the distribution from tt MC dilepton events (yellow dots). The plot is done after all cuts are applied. There are five remaining candidates. | |
| Ht distribution of the dilepton candidate events superimposed with the Ht distribution from tt MC. Ht cut is Ht>200 GeV. | |
Dilepton invariant mass distribution for the five candidate events superimposed with the same distribution from tt MC. | |
| Pt(l1) vs Pt(l2) for the five candidate events and tt MC. Note: for electrons we use Et and for muons Pt. | |
Met for the five dilepton candidates and tt MC | |
| 2D deltaphi between the leptons vs Met for the five candidates and tt MC | |
Summary table of backgrounds and signal expectations along with the number of observed events in data. | |
| Summary table of backgrounds and signal expectations along with the number of observed events in data. | |
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ttbar cross section measurement in the l+jets channel (e,mu) |
| Caption | Thumbnails | Caption | Thumbnails |
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| Positively tagged data events (dots), along with the various background contributions to the tagged W+jets sample. Method II background estimate is used |  |
Positively tagged data events (dots), along with the total background +/-1sigma error (filled box). Method II background estimate is used |  |
| Positively tagged data events (dots), along with the total background (including the measured tt contribution) +/-1sigma error (filled box). Method II background estimate is used |  |
Data vs simulation comparisons of b-tag related variables in tagged events with 3 or more jets. Each entry in the histogram represents one tagged jet. The following variables are compared (clockwise): pT, pseudo-ctau and number of good tracks in the sec. vertex and its mass. |  |
| Comparison of the observed and expected SVX tags in the Z+jets sample |  |
The number of observed positively tagged events and the background summary. The corrected total refers to the background estimate after removing the tt contribution to the W+jets sample |  |
| Comparison of the RunI and RunII cross section measurement compared with theory prediction |  |
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Top Mass reconstruction in pre-tagged l+jets events (e,mu) |
| Caption | Thumbnails | Caption | Thumbnails |
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| Signal (Mtt=175 GeV) and Background (Vecbos) templates for pre-tagged l+4jets events |  |
Fitter Input versus Output |  |
| Systematic table (pre-tag l+4jets events) |  |
Reconstructed mass distribution of pre-tagged l+4jets events |  |
| Error distribution |  |
Reconstructed mass distribution of tagged l+3.5jets events |  |
Event Displays |
| Run/Event | COT | Lego | Svx | kin. info | |||||
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| Dilepton e-mu Run/Event 143257/760520 |  |
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| Dilepton e-e Run/Event 153374/276742 |  |
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| Dilepton mu-mu Run/Event 154654/7344016 |  |
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| Dilepton e-mu Run/Event 155114/478702 |  |
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| Dilepton e-mu Run/Event 156484/3099305 |  |
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| mu+4jets Run/Event 153693/799494 |  |
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SecVtx Performances |
| Caption | Thumbnails | Caption | Thumbnails |
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| Positive and negative tag rates as a function of Et(a) and (taggable) track multiplicity (b) in the combined jet sample. The rates have been integrated over SumEt, as well as the track multiplicity (upper plot) and Et (lower plot) |  |
Table of systematic uncertainties on the mistag rate matrix |  |
| Efficiency to tag a bjet as a function of jet Et (top). The jet is required to be fiducial (not taggable). Ratio of b tagging efficiency in data and MC as a function of jet Et, i.e. "scale factor" (bottom) |  |
Comparison of data and realistic MonteCarlo |  |
| Positive and negative tag rates in the Jet50 sample (top). Positive tag rate excess as a function of jet Et in the Jet50 sample (middle). Ratio of positive tag rate in data and MC for the Jet50 sample (bottom) |  |
Positive tag rate excess as a function of jet Et in the Jet50 sample compard with Pythia dijet MC |  |
| Tagging efficiency for taggable jet in tt MC as a function of jet Et |  |
Tagging efficiency for taggable jet in tt MC as a function of jet Et (top). Fraction of taggable b jets in tt events as a function of jet Et |  |