304 research outputs found

    Influência do super-resfriamento nas ligas cu-al-ni com efeito de memória de forma

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    Nesse trabalho foi avaliada a microestrutura da liga 83%Cu – 13%Al – 4%Ni (porcentagem em peso) em 3 condições experimentais: a) estado bruto de fusão, b) estado bruto de fusão temperada e c) solidificada com fluxo. A liga no estado bruto de fusão apresentou grãos contendo partículas precipitadas no interior dos grãos, sem a presença de martensíta e o contorno desses grãos foi definido pelas partículas segregadas, enquanto a liga no estado bruto de fusão temperada apresentou grãos com a presença de martensíta e contornos sem precipitados. A liga solidificada com fluxo apresentou grãos com a presença de martensíta e sem precipitado

    Search for supersymmetry in events with a photon, a lepton, and missing transverse momentum in pp collisions at root s=8 TeV

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    Observation of top quark pairs produced in association with a vector boson in pp collisions at s=8 √s=8TeV

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    Measurements of the cross sections for top quark pairs produced in association with a W or Z boson are presented, using 8 TeV pp collision data corresponding to an integrated luminosity of 19.5 fb −1 , collected by the CMS experiment at the LHC. Final states are selected in which the associated W boson decays to a charged lepton and a neutrino or the Z boson decays to two charged leptons. Signal events are identified by matching reconstructed objects in the detector to specific final state particles from t t ¯ W tt¯W or t t ¯ Z tt¯Z decays. The t t ¯ W tt¯W cross section is measured to be 382 − 102 + 117 fb with a significance of 4.8 standard deviations from the background-only hypothesis. The t t ¯ Z tt¯Z cross section is measured to be 242 − 55 + 65 fb with a significance of 6.4 standard deviations from the background-only hypothesis. These measurements are used to set bounds on five anomalous dimension-six operators that would affect the t t ¯ W tt¯W and t t ¯ Z tt¯Z cross sections

    Angular analysis of the decay B-0 -> K*(0)mu(+)mu(-) from pp collisions at root s=8 TeV

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    Erratum to: Search for third-generation scalar leptoquarks in the tτ channel in proton-proton collisions at √s=8TeV

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    Combined search for anomalous pseudoscalar HW couplings in VH(H -> b(b)over-bar) production and H -> VV decay

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    Search for a charged Higgs boson in pp collisions at root s=8 TeV

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    Search for a massive resonance decaying into a Higgs boson and a W or Z boson in hadronic final states in proton-proton collisions at s√=8 TeV

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    A search for a massive resonance decaying into a standard-model-like Higgs boson (H) and a W or Z boson is reported. The analysis is performed on a data sample corresponding to an integrated luminosity of 19.7 fb1^{-1}, collected in proton-proton collisions at a centre-of-mass energy of 8TeV with the CMS detector at the LHC. Signal events, in which the decay products of Higgs, W, or Z bosons at high Lorentz boost are contained within single reconstructed jets, are identified using jet substructure techniques, including the tagging of b hadrons. This is the first search for heavy resonances decaying into HW or HZ resulting in an all-jet final state, as well as the first application of jet substructure techniques to identify H → WW* → 4q decays at high Lorentz boost. No significant signal is observed and limits are set at 95% confidence level on the production cross sections of W` and Z` in a model with mass-degenerate charged and neutral spin-1 resonances. Resonance masses are excluded for W0 in the interval [1.0, 1.6]TeV, for Z` in the intervals [1.0, 1.1] and [1.3, 1.5]TeV, and for mass-degenerate W` and Z` in the interval [1.0, 1.7]TeV
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