45 research outputs found

    Precise determination of the mass of the Higgs boson and tests of compatibility of its couplings with the standard model predictions using proton collisions at 7 and 8 TeV

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    Search for the standard model Higgs boson produced in association with a top-quark pair in pp collisions at the LHC

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    This is the pre-print version of the final published paper that is available from the link below.A search for the standard model Higgs boson produced in association with a top-quark pair is presented using data samples corresponding to an integrated luminosity of 5.0 fb-1 (5.1 fb-1) collected in pp collisions at the center-of-mass energy of 7TeV (8TeV). Events are considered where the top-quark pair decays to either one lepton+jets (tt→lvqq’bb) or dileptons [tt→l(+)vl(-)vbb], l being an electron or a muon. The search is optimized for the decay mode H → bb. The largest background to the ttH signal is top-quark pair production with additional jets. Artificial neural networks are used to discriminate between signal and background events. Combining the results from the 7TeV and 8TeV samples, the observed (expected) limit on the cross section for Higgs boson production in association with top quark pairs for a Higgs boson mass of 125 GeV is 5.8 (5.2) times the standard model expectatio

    Measurement of the hadronic activity in events with a Z and two jets and extraction of the cross section for the electroweak production of a Z with two jets in pp collisions at s=7 \sqrt{s}=7 TeV

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    Search for t t ¯ tt \mathrm{t}\overline{\mathrm{t}} resonances in highly boosted lepton+jets and fully hadronic final states in proton-proton collisions at s = 13 s=13 \sqrt{s}=13 TeV

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    Syrian refugees in Turkey

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    Migration Policy CentreThis report provides an overview of Syrian migration to Turkey since the start of the revolt in Syria in March 2011. The number of displaced Syrians crossing the border into Turkey has dramatically risen with the escalating use of violence employed by the Syrian regime ito suppress the revolt. According to the United Nations Refugee Agency, 182,621 Syrian refugees were living in Turkey mid-February 2013 (http://data.unhcr.org/syrianrefugees/regional.php). With the influx of huge numbers of Syrians into Turkey, anti-immigrant, anti-Arab discourses have surfaced among the Turkish public. Furthermore, due to the Turkish governments’ openly hostile position to the Syrian regime, Syrian migration became closely linked with Turkish domestic politics and foreign policy. Those individuals and political bodies critical of the Turkish government assumed an anti-immigrant position accusing displaced Syrians of being armed, sectarian rebels. Therefore, analyzing the Syrian migrant community in Turkey means contextualizing it within the political framework of the host-society.The MPC is co-financed by the European University Institute and the European Unio

    Polybrominated Diphenyl Ethers in Marine Ecosystems of the American Continents: Foresight from Current Knowledge

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    The physics and physiology of storage

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