[en] This paper presents recent results in QCD and diffraction physics obtained by the DO experiment at the Fermilab Tevatron pp-bar collider at s=1.96 TeV. The data used correspond to an integrated luminosity up to 150 pb^-1. The different measurements are jet inclusive and dijet cross sections, dijet azimuthal decorrelation, diffractively produced Z bosons and elastic scattering study

[en] A prospective analysis for the discovery of a light Higgs boson in the Compact Muon Solenoid (CMS) experiment at the Large Hadron Collider (LHC) is presented. The associated production channels WH and ZH of a Higgs boson decaying into a photon pair are studied using a full detector simulation. The method of analysis here employed should permit the utilization of real data once they become available in order to optimize the analysis performance and to estimate background rates. Minimizing in this way reliance on simulated data should allow a significant reduction in systematic errors. One year of LHC running at high luminosity (integrated luminosity of 100 fb^-1) should allow an observation at 3σ of the Standard Model Higgs boson from the LEP lower limit of 114.4 GeV/c² up to 146 GeV/c². Three years of running at high luminosity should allow a 5σ discovery from the LEP lower limit up to 148 GeV/c². In the context of supersymmetric models, the dominant gluon fusion Higgs boson production process could be strongly suppressed. This light Higgs gluophobic scenario could occur when the mixing in the stop sector is maximal. In such a case, the associated production channels WH and ZH may be recovery channels. (research note from collaboration)

[en] The authors report a measurement of the B_s⁰ lifetime in the semileptonic decay channel B_s⁰ → D_s^-μ⁺νX (and its charge conjugate), using approximately 0.4 fb^-1 of data collected with the D0 detector during 2002-2004. They have reconstructed 5176 D_s^- μ⁺ signal events, where the D_s^- is identified via the decay D_s⁰ → φπ^-, followed by φ → K⁺K^-. Using these events, they have measured the B_s⁰ lifetime to be τ(B_s⁰) = 1.398 ± 0.044 (stat)_-0.025^+0.028(syst) ps. This is the most precise measurement of the B_s⁰ lifetime to date

[en] We present a search for electroweak production of single top quarks in the s-channel (p(bar p) → t(bar b) + X) and t-channel (p(bar p) → tq(bar b) + X) modes. We have analyzed 230 pb^-1 of data collected with the D0 detector at the Fermilab Tevatron collider at a center-of-mass energy of √s = 1.96 TeV. Two separate analysis methods are used: neural networks and a cut-based analysis. No evidence for a single top quark signal is found. We set 95% confidence level upper limits on the production cross sections using Bayesian statistics, based on event counts and binned likelihoods formed from the neural network output. The limits from the neural network (cut-based) analysis are 6.4 pb (10.6 pb) in the s-channel and 5.0 pb (11.3 pb) in the t-channel

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[en] The Compact Muon Solenoid (CMS) is one of the experiments at the Large Hadron Collider (LHC) under construction at CERN. Its inner tracking system consist of the world largest Silicon Strip Tracker (SST). In total it implements 24,244 silicon sensors covering an area of 206 m². To construct a large system of this size and ensure its functionality for the full lifetime of 10 years under LHC condition, the CMS collaboration developed an elaborate design and a detailed quality assurance program. This paper describes the strategy and shows first results on sensor qualification

[en] The D0 experiment enjoyed a very successful data-collection run at the Fermilab Tevatron collider between 1992 and 1996. Since then, the detector has been upgraded to take advantage of improvements to the Tevatron and to enhance its physics capabilities. We describe the new elements of the detector, including the silicon microstrip tracker, central fiber tracker, solenoidal magnet, preshower detectors, forward muon detector, and forward proton detector. The uranium/liquid-argon calorimeters and central muon detector, remaining from Run I, are discussed briefly. We also present the associated electronics, triggering, and data acquisition systems, along with the design and implementation of software specific to D0

[en] A search for the production of neutral Higgs bosons Φ decaying into τ⁺τ^- final states in p(bar p) collisions at a center-of-mass energy of 1.96 TeV is presented. The data, corresponding to an integrated luminosity of approximately 325 pb^-1, were collected by the D0 experiment at the Fermilab Tevatron Collider. Since no excess compared to the expectation from standard model processes is found, limits on the production cross section times branching ratio are set. The results are combined with those obtained from the D0 search for Φb((bar b)) → b(bar b)b((bar b)) and are interpreted in the minimal supersymmetric standard model