TECHNICAL AND ECONOMIC VIABILITY OF COMMERCIAL PLANTATIONS IN AREAS ACCIDENTS IN SOUTH OF THE ESP\ucdRITO SANTO STATE, BRAZIL

Esta pesquisa objetivou realizar uma an\ue1lise t\ue9cnica e econ\uf4mica da implanta\ue7\ue3o e manuten\ue7\ue3o de plantios de eucalipto em \ue1reas com topografia acidentada no sul do Esp\uedrito Santo. O trabalho foi executado em pequenas propriedades rurais. Foram analisados o rendimento, a produtividade e os custos envolvidos nas atividades. De acordo com os resultados, a opera\ue7\ue3o de capina qu\uedmica manual obteve o maior rendimento (0,191 hectare/hora) e a atividade de replantio obteve o menor (0,008 hectare/hora). Quanto aos custos operacionais, as opera\ue7\uf5es realizadas durante o preparo do solo para o plantio tiveram o maior custo (32%), seguido das atividades de manuten\ue7\ue3o (27%), atividades pr\ue9vias de preparo da \ue1rea (22%) e plantio (19%).This research aimed to carry out a technical and economic analysis of the deployment and maintenance of eucalyptus crops on areas with steep topography, in small farms in south 'Esp\uedrito Santo' state, Brazil. The yield, the productivity of operations and the costs involved in activities were analyzed. According to the results, the operation of chemical weed control manual had the highest yield (0.191 ha hour-1) and the activity of replanting had the lowest (0.008 ha hour-1). Concerned to the operation costs, the operations during the soil preparation for planting had the highest cost (32%), followed by maintenance activities (27%), previous activities of preparation of the area (22%) and plantation (19%)

Measurement of the cross-section and charge asymmetry of WW bosons produced in proton-proton collisions at s=8\sqrt{s}=8 TeV with the ATLAS detector

This paper presents measurements of the $W^+ \rightarrow \mu^+\nu$ and $W^- \rightarrow \mu^-\nu$ cross-sections and the associated charge asymmetry as a function of the absolute pseudorapidity of the decay muon. The data were collected in proton--proton collisions at a centre-of-mass energy of 8 TeV with the ATLAS experiment at the LHC and correspond to a total integrated luminosity of 20.2~\mbox{fb^{-1}}. The precision of the cross-section measurements varies between 0.8% to 1.5% as a function of the pseudorapidity, excluding the 1.9% uncertainty on the integrated luminosity. The charge asymmetry is measured with an uncertainty between 0.002 and 0.003. The results are compared with predictions based on next-to-next-to-leading-order calculations with various parton distribution functions and have the sensitivity to discriminate between them.Comment: 38 pages in total, author list starting page 22, 5 figures, 4 tables, submitted to EPJC. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/STDM-2017-13

Search for chargino-neutralino production with mass splittings near the electroweak scale in three-lepton final states in √s=13 TeV pp collisions with the ATLAS detector

A search for supersymmetry through the pair production of electroweakinos with mass splittings near the electroweak scale and decaying via on-shell W and Z bosons is presented for a three-lepton final state. The analyzed proton-proton collision data taken at a center-of-mass energy of √s=13  TeV were collected between 2015 and 2018 by the ATLAS experiment at the Large Hadron Collider, corresponding to an integrated luminosity of 139  fb−1. A search, emulating the recursive jigsaw reconstruction technique with easily reproducible laboratory-frame variables, is performed. The two excesses observed in the 2015–2016 data recursive jigsaw analysis in the low-mass three-lepton phase space are reproduced. Results with the full data set are in agreement with the Standard Model expectations. They are interpreted to set exclusion limits at the 95% confidence level on simplified models of chargino-neutralino pair production for masses up to 345 GeV