Accuracy versus precision in boosted top tagging with the ATLAS detector

Abstract The identification of top quark decays where the top quark has a large momentum transverse to the beam axis, known as top tagging, is a crucial component in many measurements of Standard Model processes and searches for beyond the Standard Model physics at the Large Hadron Collider. Machine learning techniques have improved the performance of top tagging algorithms, but the size of the systematic uncertainties for all proposed algorithms has not been systematically studied. This paper presents the performance of several machine learning based top tagging algorithms on a dataset constructed from simulated proton-proton collision events measured with the ATLAS detector at √ s = 13 TeV. The systematic uncertainties associated with these algorithms are estimated through an approximate procedure that is not meant to be used in a physics analysis, but is appropriate for the level of precision required for this study. The most performant algorithms are found to have the largest uncertainties, motivating the development of methods to reduce these uncertainties without compromising performance. To enable such efforts in the wider scientific community, the datasets used in this paper are made publicly available.</jats:p

Apoio social e saúde: pontos de vista das ciências sociais e humanas Social support and health: standpoints from the social and human sciences

Analisam-se os temas e as abordagens teórico-conceituais do apoio social nos artigos de importantes periódicos internacionais de ciências sociais e de medicina e nacionais de Saúde Coletiva/Saúde Pública no período 1983-2005. Procedeu-se a leitura dos resumos dos 259 textos internacionais e 57 nacionais encontrados classificando e computando as relações do apoio social com a saúde/doença/cuidado. A seguir analisaram-se os conceitos e as abordagens do apoio social do ponto de vista das teorias e dos autores das ciências sociais e humanas, em uma amostra intencional de 56 textos internacionais e 18 nacionais. A literatura internacional respalda-se na psicologia social, nas várias correntes da sociologia e da ciência política e menos na antropologia. A literatura nacional dialoga menos com as teorias psicossociais e mais com as sociológicas e as antropológicas, realçando-se pela abordagem do apoio com a rede social, a solidariedade, as trocas e os valores culturais, deslocando-se da esfera individual e privada para a capacidade de organização da sociedade civil e de ações coletivas. Diferentes correntes norteiam as análises teórico-conceituais do apoio social, sendo a literatura internacional mais antiga, diversificada, empírica e escassa de produção antropológica.<br>This article analyses the themes and conceptual-theoretical approaches of the social support in the literature from important international journals about social sciences and medicine, and in from 1983 to 2005 are analyzed. 259 international and 57 national abstracts was reading for the identification and computing the relations of the social support with health/disease/care. A deeper conceptual analysis about social support and the theories of social science were reported in an intentional sample of 56 international and 18 national texts. The international literature is based on the social psychology, in the several trends of the sociology and of the political science and less in the anthropology. The national literature dialogues less with the psychosocial theories and more with the sociological and anthropological theories. In this latter literature the social support approaches are concerned with social network theories; reciprocity, exchanges and cultural values. It is concluded that different trends guide the conceptual-theoretical analyses of the social support, being the international literature older, wider, more diversified and empirical, but with scarce anthropological production. The national literature is more reflexive them empirical