48 research outputs found

    Measurement of the production cross section for W-bosons in association with jets in pp collisions at s=7 TeV with the ATLAS detector

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    This Letter reports on a first measurement of the inclusive W + jets cross section in proton-proton collisions at a centre-of-mass energy of 7 TeV at the LHC, with the ATLAS detector. Cross sections, in both the electron and muon decay modes of the W-boson, are presented as a function of jet multiplicity and of the transverse momentum of the leading and next-to-leading jets in the event. Measurements are also presented of the ratio of cross sections sigma (W + >= n)/sigma(W + >= n - 1) for inclusive jet multiplicities n = 1-4. The results, based on an integrated luminosity of 1.3 pb(-1), have been corrected for all known detector effects and are quoted in a limited and well-defined range of jet and lepton kinematics. The measured cross sections are compared to particle-level predictions based on perturbative QCD. Next-to-leading order calculations, studied here for n <= 2, are found in good agreement with the data. Leading-order multiparton event generators, normalized to the NNLO total cross section, describe the data well for all measured jet multiplicitie

    Charged-particle multiplicities in pp interactions at root s=900 GeV measured with the ATLAS detector at the LHC ATLAS Collaboration

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    The first measurements from proton–proton collisions recorded with the ATLAS detector at the LHC are presented. Data were collected in December 2009 using a minimum-bias trigger during collisions at a centre-of-mass energy of 900 GeV. The charged-particle multiplicity, its dependence on transverse momentum and pseudorapidity, and the relationship between mean transverse momentum and charged-particle multiplicity are measured for events with at least one charged particle in the kinematic range |η|500 MeVpT>500 MeV. The measurements are compared to Monte Carlo models of proton–proton collisions and to results from other experiments at the same centre-of-mass energy. The charged-particle multiplicity per event and unit of pseudorapidity at η=0η=0 is measured to be 1.333±0.003(stat.)±0.040(syst.)1.333±0.003(stat.)±0.040(syst.), which is 5–15% higher than the Monte Carlo models predict

    Significance of Peripheral Bronchography on Coin Lesion

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    Selective Plating of LCP

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    Für den Werkstoff LCP (Liquid Crystal Polymer) wurde ein Verfahren zur selektiven Metallisierung mittels außenstromloser Kupferabscheidung entwickelt. Im Vortrag wird die Beschichtungsstrategie von LCP im Vergleich zu Polyamid diskutiert sowie die Anforderungen an den Beschichtungsprozess dargestellt. Der neu entwickelte Prozess erlaubt die selektive Beschichtung von MIDs, die durch 2-Komponenten-Spritzguß hergestellt werden. Eine zusätzliche nasschemische Aktivierung der Vorspritzlinge ist nicht erforderlich

    Animal Studies as for the Problem of the Bronchial Fistula

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    Results of PRE- and Postoperative Functional Evaluation in Tracheal Stenosis

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