9 research outputs found

    Observation of ttˉ\bar{t}H Production

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    The observation of Higgs boson production in association with a top quark-antiquark pair is reported, based on a combined analysis of proton-proton collision data at center-of-mass energies of s√=7, 8, and 13 TeV, corresponding to integrated luminosities of up to 5.1, 19.7, and 35.9fb−1, respectively. The data were collected with the CMS detector at the CERN LHC. The results of statistically independent searches for Higgs bosons produced in conjunction with a top quark-antiquark pair and decaying to pairs of W bosons, Z bosons, photons, τ leptons, or bottom quark jets are combined to maximize sensitivity. An excess of events is observed, with a significance of 5.2 standard deviations, over the expectation from the background-only hypothesis. The corresponding expected significance from the standard model for a Higgs boson mass of 125.09 GeV is 4.2 standard deviations. The combined best fit signal strength normalized to the standard model prediction is 1.26+0.31−0.26

    Search for t(t)over-barH production in the H -> b(b)over-bar decay channel with leptonic t(t)over-bar decays in proton-proton collisions at root s=13 TeV

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    A search has been performed for heavy resonances decaying to ZZ or ZW in 2l2q final states, with two charged leptons (l = e, mu) produced by the decay of a Z boson, and two quarks produced by the decay of a W or Z boson. The analysis is sensitive to resonances with masses in the range from 400 to 4500 GeV. Two categories are defined based on the merged or resolved reconstruction of the hadronically decaying vector boson, optimized for high- and low-mass resonances, respectively. The search is based on data collected during 2016 by the CMS experiment at the LHC in proton-proton collisions with a center-of-mass energy of root s = 13 TeV, corresponding to an integrated luminosity of 35.9 fb(-1). No excess is observed in the data above the standard model background expectation. Upper limits on the production cross section of heavy, narrow spin-1 and spin-2 resonances are derived as a function of the resonance mass, and exclusion limits on the production of W' bosons and bulk graviton particles are calculated in the framework of the heavy vector triplet model and warped extra dimensions, respectively.A search has been performed for heavy resonances decaying to ZZ or ZW in 2l2q final states, with two charged leptons (l = e, mu) produced by the decay of a Z boson, and two quarks produced by the decay of a W or Z boson. The analysis is sensitive to resonances with masses in the range from 400 to 4500 GeV. Two categories are defined based on the merged or resolved reconstruction of the hadronically decaying vector boson, optimized for high- and low-mass resonances, respectively. The search is based on data collected during 2016 by the CMS experiment at the LHC in proton-proton collisions with a center-of-mass energy of root s = 13 TeV, corresponding to an integrated luminosity of 35.9 fb(-1). No excess is observed in the data above the standard model background expectation. Upper limits on the production cross section of heavy, narrow spin-1 and spin-2 resonances are derived as a function of the resonance mass, and exclusion limits on the production of W' bosons and bulk graviton particles are calculated in the framework of the heavy vector triplet model and warped extra dimensions, respectively.A search is presented for the associated production of a standard model Higgs boson with a top quark-antiquark pair (ttH), in which the Higgs boson decays into a b quark-antiquark pair, in proton-proton collisions at a centre-of-mass energy =13 TeV. The data correspond to an integrated luminosity of 35.9 fb(-1) recorded with the CMS detector at the CERN LHC. Candidate ttH events are selected that contain either one or two electrons or muons from the t decays and are categorised according to the number of jets. Multivariate techniques are employed to further classify the events and eventually discriminate between signal and background. The results are characterised by an observed tH signal strength relative to the standard model cross section, = sigma/sigma(SM), under the assumption of a Higgs boson mass of 125 GeV. A combined fit of multivariate discriminant distributions in all categories results in an observed (expected) upper limit on of 1.5 (0.9) at 95% confidence level, and a best fit value of 0.72 +/- 0.24(stat) +/- 0.38(syst), corresponding to an observed (expected) signal significance of 1.6 (2.2) standard deviations above the background-only hypothesis.Peer reviewe

    Search for ttˉ\bar{t}H production in the H → bbˉ\bar{b} decay channel with leptonic ttˉ\bar{t} decays in proton-proton collisions at s=13 \sqrt{s}=13 TeV

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    A search is presented for the associated production of a standard model Higgs boson with a top quark-antiquark pair (tt ¯ H tt¯H ), in which the Higgs boson decays into a b quark-antiquark pair, in proton-proton collisions at a centre-of-mass energy s √ =13 s=13 TeV. The data correspond to an integrated luminosity of 35.9 fb−1 recorded with the CMS detector at the CERN LHC. Candidate tt ¯ H tt¯H events are selected that contain either one or two electrons or muons from the tt ¯ tt¯ decays and are categorised according to the number of jets. Multivariate techniques are employed to further classify the events and eventually discriminate between signal and background. The results are characterised by an observed tt ¯ H tt¯H signal strength relative to the standard model cross section, μ = σ/σSM, under the assumption of a Higgs boson mass of 125 GeV. A combined fit of multivariate discriminant distributions in all categories results in an observed (expected) upper limit on μ of 1.5 (0.9) at 95% confidence level, and a best fit value of 0.72 ± 0.24(stat) ± 0.38(syst), corresponding to an observed (expected) signal significance of 1.6 (2.2) standard deviations above the background-only hypothesis

    Transformationstechniken und intermediale Zitate in Karasiks und Mazzucchellis Paul Austers Stadt aus Glas

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    Aust RM. Transformationstechniken und intermediale Zitate in Karasiks und Mazzucchellis Paul Austers Stadt aus Glas. In: Trabert F, Stuhlfauth M, Johannes W, eds. Graphisches Erzählen. Neue Perspektiven auf Literatur-Comics,. Biefeld; 2015

    Patient safety from a paramedic point of view

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    Search for ttH\mathrm{t\overline{t}}H production in the HbbH\to\mathrm{b\overline{b}} decay channel with leptonic tt\mathrm{t\overline{t}} decays in proton-proton collisions at s=\sqrt{s}= 13 TeV

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    A search is presented for the associated production of a standard model Higgs boson with a top quark-antiquark pair (tt\mathrm{t\overline{t}}H), in which the Higgs boson decays into a b quark-antiquark pair, in proton-proton collisions at a centre-of-mass energy s=\sqrt{s}= 13 TeV. The data correspond to an integrated luminosity of 35.9 fb1^{-1} recorded with the CMS detector at the CERN LHC. Candidate tt\mathrm{t\overline{t}}H events are selected that contain either one or two electrons or muons from the ttˉt\bar{t} decays and are categorised according to the number of jets. Multivariate techniques are employed to further classify the events and eventually discriminate between signal and background. The results are characterised by an observed tt\mathrm{t\overline{t}}H signal strength relative to the standard model cross section, μ=σ/σSM\mu = \sigma/\sigma_{\mathrm{_{SM}}}, under the assumption of a Higgs boson mass of 125 GeV. A combined fit of multivariate discriminant distributions in all categories results in an observed (expected) upper limit on μ\mu of 1.5 (0.9) at 95% confidence level, and a best fit value of 0.72±\pm0.24 (stat) ±\pm0.38 (syst), corresponding to an observed (expected) signal significance of 1.6 (2.2) standard deviations above the background-only hypothesis
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