1,720,958 research outputs found
Search for Z-photon resonances with the ATLAS detector
No full textAn overview of the search for resonances using proton-proton collision data recorded by the ATLAS detector is presented. A search for evidence of an SM Higgs boson undergoing the decay , where or , has been performed, and a brief summary of the most recent public results is given. A search for exotic high mass resonances decaying to a final state has been performed using proton-proton collision data recorded at TeV. Leptonic decays of the boson (, where or ) have been investigated, together with hadronic decay modes (). An overview of the most recent public results is presented
Search for resonances decaying to a Z boson and a photon in the ATLAS Detector using data from the Large Hadron Collider
No full textThis thesis presents a search for resonances in the context of both the Standard Model Higgs boson and exotic high mass particles. The search for evidence of a Standard Model Higgs boson undergoing the decay , where or , is performed using proton-proton collision data recorded by the ATLAS detector at the LHC corresponding to 4.5 fb at a centre-of-mass energy TeV and 20.3 fb at a centre-of-mass energy TeV. No significant excess over the Standard Model prediction is observed and so exclusion limits on the production cross-section of an SM Higgs boson decaying to are set at 95\% confidence level: production of the Higgs boson at predictions is excluded. Refinements to the analysis are presented, making use of an alternative event classification based on the mass of the reconstructed boson to increase the sensitivity and set improved exclusion limits: production of the Higgs boson at predictions is excluded. A search for a new Higgs-like boson, , with high mass and decaying through to an final state, where or , is performed using proton-proton collision data recorded by the ATLAS detector at the LHC corresponding to 3.2 fb at a centre-of-mass energy TeV. No significant excesses above the SM background are observed and so exclusion limits at 95\% confidence level are set on the production cross section times decay branching ratio to for such a boson with mass between 250 GeV and 1.5 TeV
Search for resonances in pp collisions with the ATLAS detector
No full textAn overview of the search for resonances using proton-proton collision data recorded by the ATLAS detector is presented. A search for evidence of a Standard Model Higgs boson undergoing the decay , where or , has been performed, and a brief summary of the most recent public results is given. A search for exotic high mass resonances decaying to a final state has been performed using proton-proton collision data recorded at ~TeV. Leptonic decays of the boson (, where or ) have been investigated, together with hadronic decay modes (). An overview of the most recent public results is presented
Searches for Non-Resonant Double Higgs Production and Projections for the (HL-)LHC
No full textAn overview is presented of the latest searches for non-resonant Higgs boson pair production, performed by the ATLAS and CMS collaborations using around 36fb of data obtained at a centre-of-mass collision energy of 13 TeV. Also presented are studies examining the prospects for investigating Higgs boson pair production with the ATLAS and CMS collaborations in the context of the High-Luminosity LHC, which is expected to provide 3000fb of data at a centre-of-mass collision energy of 14TeV
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
- …
