Educando Embaixo D'Água: O Ensino de Arqueologia Subaquática no Brasil (1992-2014)

Resumo: até o início da década de 2000, o único caminho possível para formação em Arqueologia Subaquática era através da pós-graduação. Mas, com a expansão do ensino público federal, a Arqueologia Subaquática ampliou seu raio de ação ao ser inserida na grade de algumas graduações em Arqueologia. Nesse sentido, o artigo propõe apresentar nossa visão sobre o histórico recente desse processo. Palavras-chave: Arqueologia subaquática. Arqueologia marítima. Ensino superior. Graduação em Arqueologia

Scientific diving in Brazil: history, present and perspectives

Scientific diving (SD) is defined as any diving activity that applies scientific procedures to produce subsidies forstudies and technical works in underwater environments. The first report of an underwater scientific study inBrazil dates to the 19th century, in the Abrolhos reefs. Currently, in Brazil, scientific diving has been performedin various areas, from shallow coastal regions to remote and sometimes hard-to-reach places, such as oceanicislands, flooded caves, and icy areas like Antarctica. However, the regulation of SD in Brazil still lacks moreconcrete actions towards an effective and efficient self-regulation that offers physical safety to practitioners andinstitutional safeguards for organizations that use it in their research projects. Thus, this article aims to contributeto a better understanding of this critical issue in Brazil and to serve as a reference and incentive for the trainingof professionals and the development of these activities in the country. It includes: 1) a historical review ofSD; 2) a diagnosis of the training and application of SD in Brazil; 3) the evolution of marine sciences in Brazilfrom the perspective of SD; 4) a review of the use of environmental assessment and underwater conservationtechniques in oceans and internal waters; 5) an analysis of the evolution of scientific diver training in Brazil,including a diagnosis on training; 6) the history and updates of the rules, regulations, and safety of SD. Givenall the potential of diving combined with specific techniques for research, monitoring, and marine and limnicscience in Brazil, we aim to understand the evolution of scientific diving teaching and to outline perspectives inthe country, as it is crucial for the training of qualified scientists capable of performing these underwater tasks.Finally, we present futture plans for the development of this activity in Brazil from the point of view of researchand the labor market

Measurement of single top-quark production in association with a W boson in pp collisions at √s = 13 TeV with the ATLAS detector

The inclusive cross section for the production of a single top quark in association with a W boson is measured using 140 fb−1 of proton-proton collision data collected with the ATLAS detector at √s = 13 TeV. Events containing two charged leptons and at least one jet identified as originating from a b-quark are selected. A multivariate discriminant is constructed to separate the tW signal from the t¯t background. The cross section is extracted using a profile likelihood fit to the signal and control regions and it is measured to be σtW = 75+15 −14 pb, in good agreement with the Standard Model prediction. The measured cross section is used to extract a value for the left-handed form factor at the Wtb vertex times the Cabibbo-Kobayashi-Maskawa matrix element |fLVVtb| of 0.97 0.10

Search for decays of the Higgs boson into a pair of pseudoscalar particles decaying into bb¯τ+τ− using pp collisions at √s = 13 TeV with the ATLAS detector

This paper presents a search for exotic decays of the Higgs boson into a pair of new pseudoscalar particles, H → aa, where one pseudoscalar decays into a b-quark pair and the other decays into a τ-lepton pair, in the mass range 12 ≤ ma ≤ 60 GeV. The analysis uses pp collision data at √s = 13 TeV collected with the ATLAS detector at the LHC, corresponding to an integrated luminosity of 140 fb−1. No significant excess above the Standard Model (SM) prediction is observed. Assuming the SM Higgs boson production cross section, the search sets upper limits at 95% confidence level on the branching ratio of Higgs bosons decaying into bb¯ τ+τ−, B(H → aa → bb¯ τ+τ−), between 2.2% and 3.9% depending on the pseudoscalar mass

Combination of searches for Higgs boson pair production in pp collisions at √s = 13 TeV with the ATLAS detector

This Letter presents results from a combination of searches for Higgs boson pair production using 126–140 fb−1 of proton-proton collision data at √s = 13 TeV recorded with the ATLAS detector. At 95% confidence level (CL), the upper limit on the production rate is 2.9 times the standard model (SM) prediction, with an expected limit of 2.4 assuming no Higgs boson pair production. Constraints on the Higgs boson self-coupling modifier κλ = λHHH=λSM HHH, and the quartic HHVV coupling modifier κ2V = gHHVV=gSM HHVV, are derived individually, fixing the other parameter to its SM value. The observed 95% CL intervals are −1.2 < κλ < 7.2 and 0.6 < κ2V < 1.5, respectively, while the expected intervals are −1.6 < κλ < 7.2 and 0.4 < κ2V < 1.6 in the SM case. Constraints obtained for several interaction parameters within Higgs effective field theory are the strongest to date, offering insights into potential deviations from SM predictions

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

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