1,721,092 research outputs found
Measurements of the properties of the Higgs-like boson in the four lepton decay channel with the ATLAS detector
No full textThis poster presents the latest search results and property measurements of the observed Higgs-like boson in the decay channel H → ZZ(∗) → l+l−l′+l′−, where l, l′ = e or µ. Based on the entire dataset collected by the ATLAS experiment at the LHC corresponding to integrated luminosities of 4.6 fb-1 in 2011 at √s = 7 TeV and 20.7 fb-1 in 2012 at √s = 8 TeV, the measurements of the mass, coupling and spin-parity properties of the new particle are shown
Measurement of Properties of the Higgs Boson in Bosonic Decay Channels using the ATLAS Detector
No full textThe paper reports the properties of the Higgs boson measured in bosonic decay channels (H→ZZ∗→4l, H→γγ, H→WW∗→llνν and H→Zγ→llγ) with 25 fb−1 of pp collision data from the LHC run-1 collected by the ATLAS detector. An improved mass measurement, as well as new fiducial and differential cross sections measurements are discussed
ATLAS measurements of Higgs boson properties in bosonic decay channels
No full textA detailed review of the results on the main properties of the Higgs boson in the diphoton, ZZ (with subsequent decays to four leptons), WW (with subsequent decays to lvlv) and Z-photon channels, with the ATLAS detector using approximately 25 fb-1 of pp collision data collected at 7 TeV and 8 TeV in 2011 and 2012, will be given. The measurements discussed will be the mass, couplings properties and main quantum numbers in these channels through various production processes
Electron Performances in ATLAS
No full textProviding an efficient electron reconstruction and identification over a wide energy range (5 GeV – 1 TeV) is of great importance to the Atlas physics program. During 2012 data-taking, a new reconstruction scheme was exploited, to better describe the loss of energy due to Bremsstrahlung in the detector. The existing cut-based identification menus were re-optimized to cope with the harsher pile-up conditions, and new MVA-based menus were developed, achieving almost doubled rejection power. The accuracy with which the MC models the electron efficiency plays an important role in cross-section measurements and various searches for new physics. In order to achieve reliable physics results, the MC samples need to be corrected to reproduce the measured data efficiencies as closely as possible. Precise efficiency measurement in data and MC over the entire ET range is therefore very important, and it is achieved exploiting two complementary samples, Z→ee and J/ψ→ee, and five different analysis
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
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