31 research outputs found

    Lernen aus problematischen Kinderschutzverläufen. Machbarkeitsexpertise zur Verbesserung des Kinderschutzes durch systematische Fehleranalyse

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    Fehler und Irrtümer Einzelner sind Herausforderungen an Systeme, nicht dumm zu bleiben, sondern Rahmenbedingungen zu verändern. Die vorliegende Expertise zur Verbesserung von Kinderschutz durch systematische Fehleranalyse nähert sich der Problematik zunächst über die mediale Rezeption von Fehlern und Problemfällen, also über die in der Öffentlichkeit wahrgenommene Spitze des Eisberges. Dann wird in einem zweiten Abschnitt die Methodik der Fehleranalyse aus anderen Anwendungsbereichen in Industrie und Management (z. B. Luft- und Raumfahrt, Reaktorsicherheit, Medizin) dargestellt, um schließlich internationale Vorbilder für entsprechende Fehleranalysen im Kinderschutz und in der Jugendhilfe zu erörtern. Qualitative Interviews zur Praktikerperspektive im Kinderschutz, zu Leitungsfragen und schließlich Gespräche zum Management sind eine weitere Erkenntnisquelle dieses Gutachtens. Anschließend werden die dargelegten Befunde interpretiert und in Schlussfolgerungen und Empfehlungen für ein deutsches Projekt zur Fehleranalyse übergeführt

    Search for dark matter produced in association with bottom or top quarks in √s = 13 TeV pp collisions with the ATLAS detector

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    A search for weakly interacting massive particle dark matter produced in association with bottom or top quarks is presented. Final states containing third-generation quarks and miss- ing transverse momentum are considered. The analysis uses 36.1 fb−1 of proton–proton collision data recorded by the ATLAS experiment at √s = 13 TeV in 2015 and 2016. No significant excess of events above the estimated backgrounds is observed. The results are in- terpreted in the framework of simplified models of spin-0 dark-matter mediators. For colour- neutral spin-0 mediators produced in association with top quarks and decaying into a pair of dark-matter particles, mediator masses below 50 GeV are excluded assuming a dark-matter candidate mass of 1 GeV and unitary couplings. For scalar and pseudoscalar mediators produced in association with bottom quarks, the search sets limits on the production cross- section of 300 times the predicted rate for mediators with masses between 10 and 50 GeV and assuming a dark-matter mass of 1 GeV and unitary coupling. Constraints on colour- charged scalar simplified models are also presented. Assuming a dark-matter particle mass of 35 GeV, mediator particles with mass below 1.1 TeV are excluded for couplings yielding a dark-matter relic density consistent with measurements

    Measurements of top-quark pair differential cross-sections in the eμe\mu channel in pppp collisions at s=13\sqrt{s} = 13 TeV using the ATLAS detector

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    Measurement of the W boson polarisation in ttˉt\bar{t} events from pp collisions at s\sqrt{s} = 8 TeV in the lepton + jets channel with ATLAS

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    Search for single production of vector-like quarks decaying into Wb in pp collisions at s=8\sqrt{s} = 8 TeV with the ATLAS detector

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    Search for dark matter in association with a Higgs boson decaying to bb-quarks in pppp collisions at s=13\sqrt s=13 TeV with the ATLAS detector

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    Measurement of the bbb\overline{b} dijet cross section in pp collisions at s=7\sqrt{s} = 7 TeV with the ATLAS detector

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    Measurement of the charge asymmetry in top-quark pair production in the lepton-plus-jets final state in pp collision data at s=8TeV\sqrt{s}=8\,\mathrm TeV{} with the ATLAS detector

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    Measurement of jet fragmentation in Pb+Pb and pppp collisions at sNN=2.76\sqrt{{s_\mathrm{NN}}} = 2.76 TeV with the ATLAS detector at the LHC

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    Charged-particle distributions at low transverse momentum in s=13\sqrt{s} = 13 TeV pppp interactions measured with the ATLAS detector at the LHC

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