Download or read book Search for Top Pair Production in the Dilepton Decay Channel with Tau Lepton at the CDF Experiment written by Stéphane Tourneur and published by . This book was released on 2006 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt: The search for top quark decays with tau leptons in p/pbar collisions at sqrt(s)=1.96 TeV using the CDF detector has two main goals: To observe one of the last top decay channels yet to be observed and to search for possible excesses over the standard model expectations. The signal is tiny and difficult to extract from a high background dominated by Z->TauTau+2 jets events, and W+3 jets in which a jet is misidentified as a hadronic tau. One of the main original of this work is the development of a rigorous estimation method of the tricky W+jets background in an environment characterized by a high missing transverse energy, one electron or muon, and one hadronic tau. The analysis makes use of two successive data samples with 350/pb and 1/fb of integrated luminosity. After a thorough control of the method, a 92\% signal evidence is established with 1/fb of data. The relative excess of the top in tau signal is also constrained down to R