Search for W′→tb→qqbbW' \rightarrow tb \rightarrow qqbb W ′ → t b → q q b b decays in pppp p p collisions at s\sqrt{s} s = 8 TeV with the ATLAS detector

A search for a massive W′ gauge boson decaying to a top quark and a bottom quark is performed with the ATLAS detector in pp collisions at the LHC. The dataset was taken at a centre-of-mass energy of s√=8 TeVs=8 TeV and corresponds to 20.3 fb −120.3 fb −1 of integrated luminosity. This analysis is done in the hadronic decay mode of the top quark, where novel jet substructure techniques are used to identify jets from high-momentum top quarks. This allows for a search for high-mass W′ bosons in the range 1.5–3.0 TeV TeV. bb-tagging is used to identify jets originating from bb-quarks. The data are consistent with Standard Model background-only expectations, and upper limits at 95 % confidence level are set on the W′→tbW′→tb cross section times branching ratio ranging from 0.16pb0.16pb to 0.33pb0.33pb for left-handed W′W′ bosons, and ranging from 0.10pb0.10pb to 0.21pb0.21pb for W′ bosons with purely right-handed couplings. Upper limits at 95 % confidence level are set on the W′-boson coupling to tb as a function of the W′ mass using an effective field theory approach, which is independent of details of particular models predicting a W′ boson

Factors associated with female sterilization in Brazil

This study aims to investigate factors associated with female sterilization in Brazil. The analysis is innovative because it adds the time of exposure to the risk of sterilization into survival models. The models control for postpartum duration, age at delivery, parity at delivery, type of delivery, place of delivery, region of residence at the time of interview, color/race, and years of schooling at the time of interview. The main contribution of this analysis is to comprehend the effects of different birth intervals (postpartum duration) on the risk of a woman getting sterilized. Data is from the 2006 Brazilian National Survey on Demography and Health of Children and Women (PNDS). The strongest probability that sterilization might occur was observed among women who gave birth at private hospitals and received support from health insurance companies at childbirth. Female sterilization is also executed in combination with childbirth and cesarean section. The findings suggest that years of schooling do not predict the risk of sterilization. The higher chances of getting sterilized among black women are specific to the public sector at higher-order postpartum duration (interval sterilization)

Violence against women, Espírito Santo, Brazil

OBJETIVO Estimar a prevalência e os fatores associados às violências psicológica, física e sexual nas mulheres vítimas de violência perpetrada pelo parceiro íntimo atendidas nos serviços de atenção primária. MÉTODOS Estudo transversal, realizado em 26 unidades de saúde do município de Vitória, no Espírito Santo, de março a setembro de 2014. Foram entrevistadas 991 usuárias de 20 a 59 anos. Para classificar as violências psicológica, física e sexual foi utilizado o instrumento da Organização Mundial de Saúde sobre violência contra a mulher e um questionário foi elaborado para investigar as características sociodemográficas, comportamentais e de história familiar e de vida da mulher. As análises estatísticas utilizadas foram: regressão de Poisson, teste exato de Fisher e Qui-quadrado. RESULTADOS As prevalências observadas foram: psicológica 25,3% (IC95% 22,6–28,2); física 9,9% (IC95% 8,1–11,9) e sexual 5,7% (IC95% 4,3–7,3). A violência psicológica manteve-se associada à escolaridade, situação conjugal, histórico materno de violência por parceiro íntimo, violência sexual na infância e ter feito uso de drogas, enquanto a agressão física esteve relacionada à idade, escolaridade, situação conjugal e a história materna de violência por parceiro íntimo. A violência sexual foi mais frequente nas mulheres de menor renda e que sofreram abuso sexual na infância. CONCLUSÕES As violências psicológica, física e sexual apresentaram alta magnitude entre as mulheres usuárias dos serviços de atenção primária de saúde. Fatores sociodemográficos, comportamentais e experiências pessoal e materna de violência influenciam a ocorrência do fenômeno.OBJECTIVE To estimate the prevalence and factors associated with psychological, physical and sexual violence in women victims of intimate partner violence assisted in the primary care services. METHODS This is a cross-sectional study, conducted in 26 health units in Vitória, State of Espírito Santo, from March to September 2014. We interviewed 991 women aged 20-59 years. To classify the psychological, physical and sexual violence, the World Health Organization instrument on violence against women was used and a questionnaire to investigate the sociodemographic, behavioral characteristics, and the women’s family and life history was developed. The statistical analyzes used were Poisson regression, Fisher’s exact test and Chi-square. RESULTS The prevalence we observed were psychological 25.3% (95%CI 22.6–28.2); physical 9.9% (95%CI 8.1–11.9) and sexual 5.7% (95%CI 4.3–7.3). Psychological violence remained associated with education, marital status, maternal history of intimate partner violence, sexual violence in childhood and drug use, while physical assault was related to age, education, marital status and maternal history of intimate partner violence. Sexual violence occurred the most among women with low income, and victims of sexual violence in childhood. CONCLUSIONS Psychological, physical and sexual violence showed highly frequency among women assisted by primary care services. Sociodemographic and behavioral factors, personal experiences, and maternal violence influence the phenomenon

Differential top-antitop cross-section measurements as a function of observables constructed from final-state particles using pp collisions at s=7\sqrt{s}=7 TeV in the ATLAS detector

See paper for full list of authors – 42 pages plus author list + cover pages (63 pages total), 13 figures, 1 table, submitted to JHEP, All figures including auxiliary tables are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/TOPQ-2013-07/International audienceVarious differential cross-sections are measured in top-quark pair ($t\bar{t}$) events produced in proton-proton collisions at a centre-of-mass energy of $\sqrt{s} = 7$ TeV at the LHC with the ATLAS detector. These differential cross-sections are presented in a data set corresponding to an integrated luminosity of $4.6$ fb$^{-1}$. The differential cross-sections are presented in terms of kinematic variables of a top-quark proxy referred to as the pseudo-top-quark whose dependence on theoretical models is minimal. The pseudo-top-quark can be defined in terms of either reconstructed detector objects or stable particles in an analogous way. The measurements are performed on $t\bar{t}$ events in the lepton+jets channel, requiring exactly one charged lepton and at least four jets with at least two of them tagged as originating from a $b$-quark. The hadronic and leptonic pseudo-top-quarks are defined via the leptonic or hadronic decay mode of the $W$ boson produced by the top-quark decay in events with a single charged lepton. The cross-section is measured as a function of the transverse momentum and rapidity of both the hadronic and leptonic pseudo-top-quark as well as the transverse momentum, rapidity and invariant mass of the pseudo-top-quark pair system. The measurements are corrected for detector effects and are presented within a kinematic range that closely matches the detector acceptance. Differential cross-section measurements of the pseudo-top-quark variables are compared with several Monte Carlo models that implement next-to-leading order or leading-order multi-leg matrix-element calculations

Search for top quark decays t → qH with H → γγ using the ATLAS detector

A search is performed for flavour-changing neutral currents in the decay of a top quark to an up-type (c, u) quark and a Higgs boson, where the Higgs boson decays to two photons. The proton-proton collision data set used corresponds to 4.7 fb-1 at √ = 7TeV and 20.3fb-1 at √ = 8TeV collected by the ATLAS experiment at the LHC. Top quark pair events are searched for in which one top quark decays to qH and the other decays to bW. Both the hadronic and the leptonic decay modes of the W boson are used. No significant signal is observed and an upper limit is set on the t → qH branching ratio of 0.79 at the 95% confidence level. The corresponding limit on the tqH coupling combination λtcH 2 + λtuH 2 is 0.17