10 research outputs found

    Measurement of b hadron lifetimes in exclusive decays containing a J/psi in p-pbar collisions at sqrt(s)=1.96TeV

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    We report on a measurement of bb-hadron lifetimes in the fully reconstructed decay modes B^+ -->J/Psi K+, B^0 --> J/Psi K*, B^0 --> J/Psi Ks, and Lambda_b --> J/Psi Lambda using data corresponding to an integrated luminosity of 4.3 fb1{\rm fb}^{-1}, collected by the CDF II detector at the Fermilab Tevatron. The measured lifetimes are τ\tauB^+ = 1.639±0.009(stat)±0.009(syst) ps1.639 \pm 0.009 ({\rm stat}) \pm 0.009 {\rm (syst) ~ ps}, τ\tauB^0 = 1.507±0.010(stat)±0.008(syst) ps1.507 \pm 0.010 ({\rm stat}) \pm 0.008 {\rm (syst) ~ ps} and τ\tauLambda_b = 1.537±0.045(stat)±0.014(syst) ps1.537 \pm 0.045 ({\rm stat}) \pm 0.014 {\rm (syst) ~ ps}. The lifetime ratios are τ\tauB^+/τ\tauB^0 = 1.088±0.009(stat)±0.004(syst)1.088 \pm 0.009 ({\rm stat})\pm 0.004 ({\rm syst}) and τ\tauLambda_b/τ\tauB^0 = 1.020±0.030(stat)±0.008(syst)1.020 \pm 0.030 ({\rm stat})\pm 0.008 ({\rm syst}). These are the most precise determinations of these quantities from a single experiment.Comment: revised version. accepted for PRL publicatio

    Measurement of ZZ production in leptonic final states at {\surd}s of 1.96 TeV at CDF

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    In this paper we present a precise measurement of the total ZZ production cross section in pp collisions at {\surd}s= 1.96 TeV, using data collected with the CDF II detector corresponding to an integrated luminosity of approximately 6 fb-1. The result is obtained by combining separate measurements in the four-charged (lll'l'), and two-charged-lepton and two-neutral-lepton (llvv) decay modes of the Z. The combined measured cross section for pp {\to} ZZ is 1.64^(+0.44)_(-0.38) pb. This is the most precise measurement of the ZZ production cross section in 1.96 TeV pp collisions to date.Comment: submitted to Phys. Rev. Let

    Cardiovascular Magnetic Resonance in Marfan syndrome

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    Search for High Mass Resonances Decaying to Muon Pairs in root s=1.96 TeV p(p)over-bar Collisions

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    We present a search for a new narrow, spin-1, high mass resonance decaying to mu(+)mu(-) + X, using a matrix-element-based likelihood and a simultaneous measurement of the resonance mass and production rate. In data with 4.6 fb(-1) of integrated luminosity collected by the CDF detector in p (p) over bar collisions at root s = 1960 GeV, the most likely signal cross section is consistent with zero at 16% confidence level. We therefore do not observe evidence for a high mass resonance and place limits on models predicting spin-1 resonances, including M > 1071 GeV/c(2) at 95% confidence level for a Z' boson with the same couplings to fermions as the Z boson

    Measurement of b Hadron Lifetimes in Exclusive Decays Containing a J/Psi in p(p)over-bar Collisions at root s=1.96 TeV

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    We report on a measurement of b-hadron lifetimes in the fully reconstructed decay modes B+-> J/psi K+, B-0 -> J/psi K*(892)(0), B-0 -> J/psi K-s(0), and Lambda(0)(b)-> J/psi Lambda(0) using data corresponding to an integrated luminosity of 4.3 fb(-1), collected by the CDF II detector at the Fermilab Tevatron. The measured lifetimes are tau(B+)=[1.639 +/- 0.009(stat)+/- 0.009(syst)]ps, tau(B-0)=[1.507 +/- 0.010(stat)+/- 0.008(syst)]ps, and tau(Lambda(0)(b))=[1.537 +/- 0.045(stat)+/- 0.014(syst)]ps. The lifetime ratios are tau(B+)/tau(B-0)=[1.088 +/- 0.009(stat)+/- 0.004(syst)] and tau(Lambda(0)(b))/tau(B-0)=[1.020 +/- 0.030(stat)+/- 0.008(syst)]. These are the most precise determinations of these quantities from a single experiment

    Design for environment: a state-of-the-art review

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    Estimating The Probability Of Informed Trading: A Bayesian Approach

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    The collection of a large number of BB hadron decays to hadronic final states at the CDF II detector is possible due to the presence of a trigger that selects events based on track impact parameters. However, the nature of the selection requirements of the trigger introduces a large bias in the observed proper decay time distribution. A lifetime measurement must correct for this bias and the conventional approach has been to use a Monte Carlo simulation. The leading sources of systematic uncertainty in the conventional approach are due to differences between the data and the Monte Carlo simulation. In this paper we present an analytic method for bias correction without using simulation, thereby removing any uncertainty between data and simulation. This method is presented in the form of a measurement of the lifetime of the BB^{-} using the mode B -> D0 pi. The BB^- lifetime is measured as τB\tau_{B^-} = 1.663 ±\pm 0.023 ±\pm 0.015 ps, where the first uncertainty is statistical and the second systematic. This new method results in a smaller systematic uncertainty in comparison to methods that use simulation to correct for the trigger bias
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