10 research outputs found

    Search for excited quarks in the y+jet final state in proton-proton collisions at s=8 TeV

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    A search for excited quarks decaying into the γ+jet final state is presented. The analysis is based on data corresponding to an integrated luminosity of 19.7 fb −1 collected by the CMS experiment in proton–proton collisions at s=8 TeV at the LHC. Events with photons and jets with high transverse momenta are selected and the γ+jet invariant mass distribution is studied to search for a resonance peak. The 95% confidence level upper limits on the product of cross section and branching fraction are evaluated as a function of the excited quark mass. Limits on excited quarks are presented as a function of their mass and coupling strength; masses below 3.5 TeV are excluded at 95% confidence level for unit couplings to their standard model partners

    Genetic and antigenic analysis of Babesia bigemina isolates from five geographical regions of Brazil

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    A molecular epidemiological study was performed with Babesia bigemina isolates from five geographical regions of Brazil. The genetic analysis was done with random amplification of polymorphic DNA (RAPD), repetitive extragenic palindromic elements-polymerase chain reaction (REP-PCR) and enterobacterial repetitive intergenic consensus sequences-polymerase chain reaction (ERIC-PCR) that showed genetic polymorphism between these isolates and generated fingerprinting. In RAPD, ILO872 and ILO876 primers were able to detect at least one fingerprinting for each B. bigemina isolate. The amplification of B. bigemina DNA fragments by REP-PCR and ERIC-PCR gave evidence for the presence in this haemoprotozoan of the sequences described previously in microorganisms of the bacterial kingdom. For the first time it was demonstrated that both techniques can be used for genetic analysis of a protozoan parasite, although the ERIC-PCR was more discriminatory than REP-PCR. The dendogram with similarity coefficient among isolates showed two clusters and one subcluster. The Northeastern and Mid-Western isolates showed the greatest genetic diversity, while the Southeastern and Southern isolates were the closest. The antigenic analysis was done through indirect fluorescent antibody technique and Western blotting using a panel of monoclonal antibodies directed against epitopes on the merozoite membrane surface, rhoptries and membrane of infected erythrocytes. As expected, the merozoite variable surface antigens, major surface antigen (MSA)-1 and MSA-2 showed antigenic diversity. However, B cell epitopes on rhoptries and infected erythrocytes were conserved among all isolates studied. In this study it was possible to identify variable and conserved antigens, which had already been described as potential immunogens. Considering that an attenuated Babesia clone used as immunogen selected populations capable of evading the immunity induced by this vaccine, it is necessary to evaluate more deeply the cross-protection conferred by genetically more distant Brazilian B. bigemina isolates and make an evaluation of the polymorphism degree of variable antigens such as MSA-1 and MSA-2

    Precarização do trabalho docente e seus efeitos sobre as práticas curriculares Teacher's work precarization and curriculum practices

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    Este artigo trata do comprometimento da função cultural da escola básica brasileira, como fruto de determinadas condições econômicas e sociais que incidem sobre seu trabalho, tornando-o frágil e insuficiente. Também expõe e analisa dados sobre a precária situação do trabalho docente e suas conseqüências sobre as práticas curriculares que têm origem na legislação educacional vigente no país.<br>This paper show how the cultural function of the Brazilian basic school is jeopardized by the economic and social conditions that make its work it fragile and insufficient. It presents and analyses some results on the precariousness of the teacher's work situation and its consequences on the curriculum practices, which have their origin in the educational laws existing in Brazil

    Search for new physics in events with same-sign dileptons and jets in pp collisions at root s = 8 TeV (vol 01, pg 163, 2014)

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    Made available in DSpace on 2015-06-25T12:55:21Z (GMT). No. of bitstreams: 0 Previous issue date: 2015Made available in DSpace on 2015-11-26T15:18:27Z (GMT). No. of bitstreams: 2 2-s2.0-84921407514.pdf: 236271 bytes, checksum: e9b67a8637560201105108af720ed1ff (MD5) 2-s2.0-84921407514.pdf.txt: 43801 bytes, checksum: a87aa49408e3fa7bb288c13764b65c79 (MD5) Previous issue date: 20152015111

    Differential cross section measurements for the production of a W boson in association with jets in proton-proton collisions at root s=7 TeV

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    741123

    Search for new resonances decaying via WZ to leptons in proton-proton collisions at root s=8TeV

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    A search is performed in proton-proton collisions at root s=8 TeV for exotic particles decaying via WZ to fully leptonic final states with electrons, muons, and neutrinos. The data set corresponds to an integrated luminosity of 19.5 fb -1 . No significant excess is observed above the expected standard model background. Upper bounds at 95% confidence level are set on the production cross section of a W`boson as predicted by an extended gauge model, and on the W`WZ coupling. The expected and observed mass limits for a W`boson, as predicted by this model, are 1.55 and 1.47 TeV, respectively. Stringent limits are also set in the context of low-scale technicolor models under a range of assumptions for the model parameters

    Search for physics beyond the standard model in final states with a lepton and missing transverse energy in proton-proton collisions at sqrt(s) = 8 TeV

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    see paper for full list of authorsA search for new physics in proton-proton collisions having final states with an electron or muon and missing transverse energy is presented. The analysis uses data collected in 2012 with the CMS detector, at an LHC center-of-mass energy of 8 TeV, and corresponding to an integrated luminosity of 19.7 inverse femtobarns. No significant deviation of the transverse mass distribution of the charged lepton-neutrino system from the standard model prediction is found. Mass exclusion limits of up to 3.28 TeV at a 95% confidence level for a W' boson with the same couplings as that of the standard model W boson are determined. Results are also derived in the framework of split universal extra dimensions, and exclusion limits on Kaluza-Klein W[KK,2] states are found. The final state with large missing transverse energy also enables a search for dark matter production with a recoiling W boson, with limits set on the mass and the production cross section of potential candidates. Finally, limits are established for a model including interference between a left-handed W' boson and the standard model W boson, and for a compositeness model

    Search For New Resonances Decaying Via Wz To Leptons In Proton-proton Collisions At √s=8tev

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    7408310

    Search for new physics in events with same-sign dileptons and jets in pp collisions at root s=8 TeV

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    2014
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