Prospects for early discoveries in final states with dileptons, jets and no missing energy: LRSM and Lepto-Quarks

Final states with high pT leptons and jets are predicted by many Beyond the Standard Model(BSM) scenarios including Grand Unification Theories, Left-Right- Symmetry and Technicolor. Studies based on fully simulated data samples containing two or more high pT leptons, jets and no missing energy have been performed in view of searching for BSM physics with a few hundred inverse picobarns of early ATLAS data. The prospects for an early discovery of first and second generation leptoquark pairs, and of right-handed W and heavy neutrinos will be shown

One Loop Effects in Various Dimensions and D-Branes

We calculate some one loop corrections to the effective action of theories in $d$ dimensions that arise on the dimensional reduction of a Weyl fermion in $D$ dimensions. The terms that we are interested in are of a topological nature. Special attention is given to the effective actions of the super Yang Mills theories that arise on dimensional reduction of the N=1 theory in six dimensions or on the dimensional reduction of the N=1 theory in ten dimensions. In the latter case we suggest an interpretation of the quantum effect as a coupling of the gauge field on the brane to a relative background gauge field.Comment: 18 pages, LaTe

Performance of a C4F8O Gas Radiator Ring Imaging Cherenkov Detector Using Multi-anode Photomultiplier Tubes

We report on test results of a novel ring imaging Cherenkov (RICH) detection system consisting of a 3 meter long gaseous C4F8O radiator, a focusing mirror, and a photon detector array based on Hamamatsu multi-anode photomultiplier tubes. This system was developed to identify charged particles in the momentum range from 3-70 GeV/c for the BTeV experiment

Discutindo a educação ambiental no cotidiano escolar: desenvolvimento de projetos na escola formação inicial e continuada de professores

A presente pesquisa buscou discutir como a Educação Ambiental (EA) vem sendo trabalhada, no Ensino Fundamental e como os docentes desta escola compreendem e vem inserindo a EA no cotidiano escolar., em uma escola estadual do município de Tangará da Serra/MT, Brasil. Para tanto, realizou-se entrevistas com os professores que fazem parte de um projeto interdisciplinar de EA na escola pesquisada. Verificou-se que o projeto da escola não vem conseguindo alcançar os objetivos propostos por: desconhecimento do mesmo, pelos professores; formação deficiente dos professores, não entendimento da EA como processo de ensino-aprendizagem, falta de recursos didáticos, planejamento inadequado das atividades. A partir dessa constatação, procurou-se debater a impossibilidade de tratar do tema fora do trabalho interdisciplinar, bem como, e principalmente, a importância de um estudo mais aprofundado de EA, vinculando teoria e prática, tanto na formação docente, como em projetos escolares, a fim de fugir do tradicional vínculo “EA e ecologia, lixo e horta”.Facultad de Humanidades y Ciencias de la Educació

Lepton energy moments, operator product expansion and the CKM parameter matrix element, V(cb)

We have determined [Special characters omitted.] and [Special characters omitted.] from truncated moments of the lepton energy spectra for both e ± and μ ± . Combining both lepton species, we measured two lepton energy moments: [Special characters omitted.] = 0.6187 ± 0.0014 ± 0.0016 and [Special characters omitted.] = 1.7810 ± 0.0007 ± 0.0009. The extracted values for [Special characters omitted.] and [Special characters omitted.] through order 1/[Special characters omitted.] in the non-perturbative expansion and [Special characters omitted.] in the perturbative one in the MS scheme, are: [Special characters omitted.] = -0.25 ± 0.02 ± 0.05 ± 0.14 and [Special characters omitted.] = 0.39 ± 0.03 ± 0.06 ± 0.12, where the uncertainties are statistical, systematic and theoretical respectively. The theoretical expression needed to extract | V cb | from the measured semileptonic width is evaluated using these HQE parameters. Using the world average for the semileptonic width, we find: [Special characters omitted.] . Finally, the short range mass of the b-quark [Special characters omitted.] is evaluated and found to be 4.82 ± 0.07| exp ± 0.11| th

Search for narrow resonances using the dijet mass spectrum in pp collisions at s√=8 TeV

Results are presented of a search for the production of new particles decaying to pairs of partons (quarks, antiquarks, or gluons), in the dijet mass spectrum in proton-proton collisions at s√=8  TeV. The data sample corresponds to an integrated luminosity of 4.0  fb−1, collected with the CMS detector at the LHC in 2012. No significant evidence for narrow resonance production is observed. Upper limits are set at the 95% confidence level on the production cross section of hypothetical new particles decaying to quark-quark, quark-gluon, or gluon-gluon final states. These limits are then translated into lower limits on the masses of new resonances in specific scenarios of physics beyond the standard model. The limits reach up to 4.8 TeV, depending on the model, and extend previous exclusions from similar searches performed at lower collision energies. For the first time mass limits are set for the Randall–Sundrum graviton model in the dijet channel

Search for new physics in events with opposite-sign leptons, jets, and missing transverse energy in pp collisions at sqrt(s) = 7 TeV

A search is presented for physics beyond the standard model (BSM) in final states with a pair of opposite-sign isolated leptons accompanied by jets and missing transverse energy. The search uses LHC data recorded at a center-of-mass energy sqrt(s) = 7 TeV with the CMS detector, corresponding to an integrated luminosity of approximately 5 inverse femtobarns. Two complementary search strategies are employed. The first probes models with a specific dilepton production mechanism that leads to a characteristic kinematic edge in the dilepton mass distribution. The second strategy probes models of dilepton production with heavy, colored objects that decay to final states including invisible particles, leading to very large hadronic activity and missing transverse energy. No evidence for an event yield in excess of the standard model expectations is found. Upper limits on the BSM contributions to the signal regions are deduced from the results, which are used to exclude a region of the parameter space of the constrained minimal supersymmetric extension of the standard model. Additional information related to detector efficiencies and response is provided to allow testing specific models of BSM physics not considered in this paper