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

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100 Section 2: CDF Godparenting The task of \godparenting" a CDF draft publication is a large responsibility and requires major eort. In the view of the collaboration, the validity of the result rests as much with the godparents as with the authors. The Harvard group often contributes by serving as godparents. Schmitt Study of inclusive leptons and dimuon invariant mass distributions. Recent studies of inclusive leptons in heavy quark jets have shown poor agreement with the simulation. There is much work to be done to get at the source of the discrepancies and to evaluate their signicance. Dorigo Properties of Jets in Top Decays. This analysis is controversial and has not yet materialized in the form of a draft paper. It is based on the work documented in the Ph.D. thesis of Ptohos. Dorigo started godparenting in December 1998. A key piece of the analysis relied on Kolmogorov-Smirnov tests between the top jets and control samples. Dorigo validated these comparisons with his own code. He also reviewed the technical aspects of the b-tagging and how its eciency is estimated from the data, which is also a key point. This estimate has been very dicult to obtain and impacts on the measurement ofthe tt cross section. The godparent report is nearly nished and the authors can begin writing a draft. Spiropulu Tests in Perturbative QCD in W Boson plus Jets Events. This analysis has been performed by a competent group. Spiropulu has analyzed a similar sample of events are part of the background studies for her 6E T +Jets analysis, and so she can provide a more \inside" viewpoint onthis analysis. Schmitt W mass measurement. This analysis was plagued by diculties in setting the energy scale for the electrons. The exhaustive studies by Gordon had shown that there was no simple, easy explanation for the discrepancies between the so-called \E/p method" and the \M Z method" (see Section 2.3.3). Excellent work in modeling and calibration had been completed, and also the muon channel was well advanced. Schmitt was invited to join a group of four godparents who advanced this analysis from inaction to publication. It was decided that the scale would be set using the Z mass,
Section 2: CDF 101 while the problems of the electron energy scale, themselves very interesting, would be an important part of the publication. Burkett Measurement of the B 0 B 0 Oscillation Frequency Using `D + Pairs and Lepton Flavor Tags. Burkett comments on the analysis and is responsible for the clarity and style of the writing. Franklin Measurement of the W asymmetry. Franklin is an expert in W physics at the Tevatron and was a chief critic of some aspects of this analysis. This result is very important in the determination of proton structure functions, which in turn are important for the W mass measurement and many other electroweak studies. Dorigo A Measurement of the Dijet Mass Dierential Cross Section in pp collisions at p s = 1:8 TeV. Dorigo started godparenting this paper in October 1998. This paper looked initially to be in good shape as the analysis relies largely on established techniques. Dorigo, however, studied a weak assumption on the location of the primary vertex, demonstrating that it was wrong 10% of the time. Correcting this improved the estimate of the selection eciency as a function of dijet mass. Dorigo's criticisms of the statistical method has spurred an improved chisquare method which is still under development. Once this is nished a draft should be ready within a month.
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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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36 Section 2: CDF 2.3 Run I Physics
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38 Section 2: CDF Physics Analysis
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