Measurement and interpretation of same-sign W boson pair production in association with two jets in pp collisions at s = 13 TeV with the ATLAS detector

This paper presents the measurement of fducial and diferential cross sections for both the inclusive and electroweak production of a same-sign W-boson pair in association with two jets (W±W±jj) using 139 fb−1 of proton-proton collision data recorded at a centre-of-mass energy of √s = 13 TeV by the ATLAS detector at the Large Hadron Collider. The analysis is performed by selecting two same-charge leptons, electron or muon, and at least two jets with large invariant mass and a large rapidity diference. The measured fducial cross sections for electroweak and inclusive W±W±jj production are 2.92 ± 0.22 (stat.) ± 0.19 (syst.)fb and 3.38±0.22 (stat.)±0.19 (syst.)fb, respectively, in agreement with Standard Model predictions. The measurements are used to constrain anomalous quartic gauge couplings by extracting 95% confdence level intervals on dimension-8 operators. A search for doubly charged Higgs bosons H±± that are produced in vector-boson fusion processes and decay into a same-sign W boson pair is performed. The largest deviation from the Standard Model occurs for an H±± mass near 450 GeV, with a global signifcance of 2.5 standard deviations

Combination of searches for heavy spin-1 resonances using 139 fb−1 of proton-proton collision data at s = 13 TeV with the ATLAS detector

A combination of searches for new heavy spin-1 resonances decaying into different pairings of W, Z, or Higgs bosons, as well as directly into leptons or quarks, is presented. The data sample used corresponds to 139 fb−1 of proton-proton collisions at = 13 TeV collected during 2015–2018 with the ATLAS detector at the CERN Large Hadron Collider. Analyses selecting quark pairs (qq, bb, , and tb) or third-generation leptons (τν and ττ) are included in this kind of combination for the first time. A simplified model predicting a spin-1 heavy vector-boson triplet is used. Cross-section limits are set at the 95% confidence level and are compared with predictions for the benchmark model. These limits are also expressed in terms of constraints on couplings of the heavy vector-boson triplet to quarks, leptons, and the Higgs boson. The complementarity of the various analyses increases the sensitivity to new physics, and the resulting constraints are stronger than those from any individual analysis considered. The data exclude a heavy vector-boson triplet with mass below 5.8 TeV in a weakly coupled scenario, below 4.4 TeV in a strongly coupled scenario, and up to 1.5 TeV in the case of production via vector-boson fusion

Combination and summary of ATLAS dark matter searches interpreted in a 2HDM with a pseudo-scalar mediator using 139 fb−1 of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si157.svg"><mml:mrow><mml:msqrt><mml:mrow><mml:mi>s</mml:mi></mml:mrow></mml:msqrt><mml:mo linebreak="goodbreak" linebreakstyle="after">=</mml:mo><mml:mn>13</mml:mn></mml:mrow></mml:math> TeV pp collision data

Results from a wide range of searches targeting different experimental signatures with and without missing transverse momentum ( ) are used to constrain a Two–Higgs-Doublet Model (2HDM) with an additional pseudo-scalar mediating the interaction between ordinary and dark matter (2HDM + a). The analyses use up to 139 fb−1 of proton–proton collision data at a centre-of-mass energy TeV recorded with the ATLAS detector at the Large Hadron Collider during 2015–2018. The results from three of the most sensitive searches are combined statistically. These searches target signatures with large and a leptonically decaying Z boson; large and a Higgs boson decaying to bottom quarks; and production of charged Higgs bosons in final states with top and bottom quarks, respectively. Constraints are derived for several common and new benchmark scenarios in the 2HDM + a

Search for dark photons in rare Z boson decays with the ATLAS detector

A search for events with a dark photon produced in association with a dark Higgs boson via rare decays of the standard model Z boson is presented, using 139     fb − 1 of √ s = 13     TeV proton-proton collision data recorded by the ATLAS detector at the Large Hadron Collider. The dark boson decays into a pair of dark photons, and at least two of the three dark photons must each decay into a pair of electrons or muons, resulting in at least two same-flavor opposite-charge lepton pairs in the final state. The data are found to be consistent with the background prediction, and upper limits are set on the dark photon’s coupling to the dark Higgs boson times the kinetic mixing between the standard model photon and the dark photon, α D ϵ 2 , in the dark photon mass range of [5, 40] GeV except for the Υ mass window [8.8, 11.1] GeV. This search explores new parameter space not previously excluded by other experiments

Combined measurement of the Higgs boson mass from the H → γγ and H → ZZ∗ → 4ℓ decay channels with the ATLAS detector using √s = 7, 8, and 13 TeV pp collision data

A measurement of the mass of the Higgs boson combining the H → Z Z ∗ → 4 ℓ and H → γ γ decay channels is presented. The result is based on 140     fb − 1 of proton-proton collision data collected by the ATLAS detector during LHC run 2 at a center-of-mass energy of 13 TeV combined with the run 1 ATLAS mass measurement, performed at center-of-mass energies of 7 and 8 TeV, yielding a Higgs boson mass of 125.11 ± 0.09 ( stat ) ± 0.06 ( syst ) = 125.11 ± 0.11     GeV . This corresponds to a 0.09% precision achieved on this fundamental parameter of the Standard Model of particle physics

Percepções de casais heterossexuais acerca do uso da camisinha feminina

Objetivou-se, nesta pesquisa exploratório-descritiva, qualitativa, conhecer as percepções de casais heterossexuais jovens, acerca do uso da camisinha feminina e compreender os fatores que propiciam e dificultam seu uso rotineiro. Coletaram-se os dados em outubro e novembro de 2007, por meio de questionário autoaplicável. Utilizou-se o Discurso do Sujeito Coletivo na análise. A idade dos 26 informantes variou entre 20 e 27 anos. Apreendeu-se que conhecem a eficiência desse método, mas reconhecem a dificuldade das mulheres para a negociação. Como limitantes apresentam pequena divulgação e alto custo. Do ato sexual protegido por camisinha feminina emergiram depoimentos discordantes. Uns enfocam o desconforto, dor e aparência grotesca, outros abordam a praticidade, confiabilidade e prazer; no entanto, salientam que a falta de familiaridade e o desconhecimento são fatores que desencadeiam grande parte das dificuldades, evidenciando, assim, a necessidade de implementação de novas estratégias de educação em saúde.This descriptive exploratory, qualitative, research was aimed to know the perception of young heterosexual couples, relating to the use of female condoms and understand the factors that propitiate and make difficult its routine use. The data had been collected in October and November of 2007, through selfadministered survey. The Discourse of the Collective Subject was used in the analysis. The age of the 26 informants vary from 20 to 27 years. It had been learned that they know the efficiency of this method, but they recognize the difficulty of women to the negotiation. As limitations to the use they express the low and the high cost. From the sexual relation protected by female condom emerged conflicting statements. Some focus on the discomfort, pain and grotesque appearance, others approach the practicality, reliability and pleasure, however they stress that the lack of familiarity and knowledge are factors that trigger many of the difficulties, evidencing the necessity of implement new strategies of health education.Esta pesquisa exploratoria-descriptiva, cualitativa, tuvo como objetivo conocer las percepciones de parejas heterosexuales jóvenes acerca del uso del preservativo femenino y comprender los factores que proporcionan y dificultan su uso rutinario. Los datos fueron recogidos en octubre y noviembre de 2007 a través de cuestionario autoaplicable. Fue utilizado el Discurso del Sujeto Colectivo en el análisis. La edad de los/as 26 informantes ha variado entre 20 y 27 años. Se ha aprehendido que conocen la eficiencia de ese método, pero reconocen la dificultad de las mujeres para la negociación. Como limitantes presentan pequeña divulgación y alto costo. Del ato sexual protegido por preservativo femenino emergieron testimonios discordantes. Unos enfocan la incomodidad, dolor y apariencia grotesca, otros abordan la practicidad, confiabilidad y placer, sin embargo resaltan que la falta de familiaridad y el desconocimiento son factores que desencadenan grande parte de las dificultades, evidenciando la necesidad de implementar nuevas estrategias de educación en salud

Tuning the electrocatalytic activity of Pt by structurally ordered PdFe/C for the hydrogen oxidation reaction in alkaline media

Title on author’s file: Pt Skin on Structurally Ordered PdFe/C Intermetallic Nanopar-ticles for Efficient Hydrogen Oxidation Reaction in Alkaline Media202308 bcvcAccepted ManuscriptRGCOthersThe National Natural Science Foundation; the 1000 Young Talent (to Deli Wang); The Innovation Research Funds of Huazhong University of Science and Technology; The Hong Kong Polytechnic UniversityPublishe

Desempenho operacional e custos de um trator na irrigação pós-plantio de eucalipto em campo

O alto investimento em operações agroflorestais mecanizadas implica a definição segura de qual será a máquina mais preconizada para a otimização da operação, vinculada aos menores custos envolvidos. Este estudo teve como objetivo avaliar o desempenho operacional e econômico da operação silvicultural de irrigação pós-plantio de eucalipto a campo. A análise técnica englobou um estudo de tempos e movimentos e, a análise econômica, as variáveis do custo operacional, custo de produção e rendimento energético. Os resultados obtidos evidenciaram que, para áreas de reflorestamento de eucalipto em primeira e terceira rotação, não há uma diferença da capacidade de campo efetiva para a operação de irrigação pós-plantio. Em decorrência do dispêndio com tempos improdutivos, houve uma redução significativa na capacidade de campo operacional e, consequentemente, uma elevação no custo de produção