19 research outputs found

    Search for dark mesons decaying to top and bottom quarks in proton-proton collisions at √s = 13 TeV with the ATLAS detector

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    A search for dark mesons originating from strongly-coupled, SU(2) dark favor symmetry conserving models and decaying gaugephobically to pure Standard Model final states containing top and bottom quarks is presented. The search targets fully hadronic final states and final states with exactly one electron or muon and multiple jets. The analyzed data sample corresponds to an integrated luminosity of 140 fb−1 of proton-proton collisions collected at √s = 13 TeV with the ATLAS detector at the Large Hadron Collider. No significant excess over the Standard Model background expectation is observed and the results are used to set the first direct constraints on this type of model. The two-dimensional signal space of dark pion masses mπD and dark rho-meson masses mρD is scanned. For mπD /mρD = 0.45, dark pions with masses mπD < 940 GeV are excluded at the 95% CL, while for mπD /mρD = 0.25 masses mπD < 740 GeV are excluded

    Combination of searches for Higgs boson decays into a photon and a massless dark photon using pp collisions at √s = 13 TeV with the ATLAS detector

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    A combination of searches for Higgs boson decays into a visible photon and a massless dark photon (H → γγd) is presented using 139 fb−1 of proton-proton collision data at a centre-of-mass energy of √s = 13 TeV recorded by the ATLAS detector at the Large Hadron Collider. The observed (expected) 95% confidence level upper limit on the Standard Model Higgs boson decay branching ratio is determined to be B(H → γγd) < 1.3% (1.5)%. The search is also sensitive to higher-mass Higgs bosons decaying into the same final state. The observed (expected) 95% confidence level limit on the cross-section times branching ratio ranges from 16 fb (20 fb) for mH = 400 GeV to 1.0 fb (1.5 fb) for mH = 3 TeV. Results are also interpreted in the context of a minimal simplified model

    Pneumoperitoneum in association with perforated appendicitis in a Brazilian Amazon woman. Case report

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    Radiographic findings of free air in the peritoneal cavity secondary to perforation of a acutely inflamed appendix are extremely rare. It accounts for about 0-7% of all patients with pneumoperitoneum. We report on a 58-years-old Brazilian Amazon woman presenting a 1- week history of abdominal pain, tenderness and distension associated with asthenia and without passage of stool or gas. Abdominal percussion revealed a tympanic sound located on the right hypocondrium. Plain chest radiography revealed a large amount of free air beneath the right leaf of the diaphram. The patient was taken immediately to the operation room and, during surgery, a gangrenous appendix with an apex perforation was verified. Appendectomy was performed as routinely. The patient evolved with pneumonia and septic shock that responded well to intravenous antibiotics and vasoactive drugs. She was discharged to home on the twenty-first post-operative day in good clinical conditions. This case highlights that perforated acute appendicitis is rarely associated with pneumoperitoneum, but it must be considered in the differential diagnosis of patients presenting right abdominal pain and free intraperitoneal air

    ASSISTÊNCIA DE ENFERMAGEM E AS SEQÜELAS NEUROLÓGICAS DO SARAMPO

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    As seqĂŒelas neurolĂłgicas do sarampo podem ocorrer como conseqĂŒĂȘncia de encefalites ou constituir o quadro chamado pan-encefalite esclerosante sub-aguda (PEESA). As encefalites sĂŁo letais em cerca de 15 a 18% dos casos, causando danos permanentes (motores e/ou mentais) em aproximadamente 25% dos pacientes. A PEESA Ă© sempre letal. Enfatiza-se as conseqĂŒĂȘncias sociais e econĂŽmicas destes problemas. Sugere-se assistĂȘncia de enfermagem de acordo com os nĂ­veis de prevenção de Leave 11 & Clark.The neurological sequelae after measles can be encephalitis or subacute sclerosing pan-encephalitis (SSPE). The encephalitis is lethal in 15-18% of the patients, that can rest handiccaped at 25%. The SSPE is always lethal. The social and economical consequences of these problems are emphaised. It is suggested nursing care by Leavell & Clark levels of prevention
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