8 research outputs found

    Search for anomalous kinematics in tt dilepton events at CDF II

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    We report on a search for anomalous kinematics of tt¯ dilepton events in pp¯ collisions at √s=1.96  TeV using 193  pb−1 of data collected with the CDF II detector. We developed a new a priori technique designed to isolate the subset in a data sample revealing the largest deviation from standard model (SM) expectations and to quantify the significance of this departure. In the four-variable space considered, no particular subset shows a significant discrepancy, and we find that the probability of obtaining a data sample less consistent with the SM than what is observed is 1.0%-4.5%

    Search for anomalous kinematics in t(t)over-bar Dilepton events at CDF II

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    We report on a search for anomalous kinematics of ttbar dilepton events in ppbar collisions at sqrt{s}=1.96 TeV using 193 {pb}^{-1} of data collected with the CDF II detector. We developed a new a priori technique designed to isolate the subset in a data sample revealing the largest deviation from standard model (SM) expectations and to quantify the significance of this departure. In the four-variable space considered, no particular subset shows a significant discrepancy and we find that the probability of obtaining a data sample less consistent with the SM than what is observed is 1.0-4.5%.Comment: 14 pages, 2 figure

    Measurement of the cross section for prompt diphoton production in pp¯ collisions at √s=1.96 TeV

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    We report a measurement of the rate of prompt diphoton production in pp¯ collisions at √s=1.96  TeV using a data sample of 207  pb−1 collected with the upgraded Collider Detector at Fermilab. The background from nonprompt sources is determined using a statistical method based on differences in the electromagnetic showers. The cross section is measured as a function of the diphoton mass, the transverse momentum of the diphoton system, and the azimuthal angle between the two photons and is found to be consistent with perturbative QCD predictions
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