1,721,320 research outputs found
Extracting jet signals of New Higgs Physics: from traditional analysis to machine learning
No full textThis thesis investigates possible parameter values of, and optimum jet reconstruction for the signals from, the two Higgs doublet model (2HDM). Possible parameter values are investigated by way of recasting a parameter scan published by ATLAS. The original analysis, performed with 36.1 fb−1 of run 2 data, investigated the possibility of observing cascade decays from the 2HDM. The study considered the process A → ZH → l +l −b ¯b (where l = e, µ) in the context of the standard four Yukawa types. A parameter space in the physical basis of the 2HDM is explored, seeking parameter combinations that are not forbidden by theoretical constraints or existing observations, and to which a detector would be sensitive. The existing study is recast in two directions, firstly the possibility of exchanging A and H is investigated. Secondly, the extrapolation to run 3 is calculated. Under exchange of H and A all detectable parameter combinations are forbidden. More promisingly, however, it is seen that run 3 will offer sensitivity to considerable areas of permissible parameter space. It is clear that these decay channels already offer potential for finding the 2HDM at the LHC. Another line of investigation that might compliment this, is the potential to improve sensitivity by better signal reconstruction techniques. In particular, jet reconstruction techniques that might expand sensitivity to cascade decays from the 2HDM ending in a four b-quark final state are sort. Firstly, the challenges of reconstructing these states with existing algorithms is evaluated, and the limitations posed by cuts in the trigger illustrated. A comparison is made between the prevalent anti-kT algorithm and a somewhat unusual algorithm termed variable-R. This finds that variable-R performs this task best, both in terms of mass peak reconstruction, and jet multiplicity. The second investigation into optimum jet construction aims to apply a novel method, spectral clustering, to the jet formation problem. Again, it is driven by an interest in reconstructing cascade decays from the 2HDM. This method proves to be insensitive to infra-red singularities in a practical sense. It is also shown to be very flexible, capable of clustering a range of signal types, without requiring alterations to its parameter settings
Bookreview of M.B. Hall, Henry Oldenburg: Shaping the Royal Society
No full textContains fulltext :
60030.pdf (Publisher’s version ) (Closed access)M.B. Hall Henry Oldenburg: Shaping the Royal Society Oxford: ,200
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Blair Hall, Henry Hall and Pyne Hall, Princeton University, Princeton, New Jersey, circa 1951-1970
No full textBlair Hall, Henry Hall and Pyne Hall, Princeton University, Princeton, New Jersey, circa 1951-1970. Caption reads: "Princeton University. Princeton, Mercer County, New Jersey. This scene shows the dormitories of Blair Hall, center, Henry Hall, left, and Pyne Hall, right. The gates in the foreground were given in memory of M. Hartley Dodge, Jr., Class of 1930." Postcard number: 66557
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe 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
Mapping pp→A→ZH→l<sup>+</sup>l<sup>−</sup>bb¯ and pp→H→ZA→l<sup>+</sup>l<sup>−</sup>bb¯ current and future searches onto 2HDM parameter spaces
No full textBy borrowing the results from a Large Hadron Collider (LHC) analysis performed with 36.1fb−1 of Run 2 data intended to search for A production followed by ZH decay in turn yielding l+l−bb¯ (l=e,μ) final states in the context of the standard four Yukawa types of the 2-Higgs Doublet Model (2HDM), we recast it in terms of sensitivity reaches for the similar process pp→H→ZA→l+l−bb¯. This simple exercise across the two processes, which is possible because the only kinematic difference between these are different widths for the Higgs bosons, in turn affecting minimally the efficiency of an experimental selection, enables us to expand the region of parameter space that can be tested to the case when mH≥mA+mZ. Furthermore, we extrapolate our results to full Run 3 data samples. We conclude that, while the high energy and luminosity stage of the LHC can afford one with increased sensitivity to the 2HDM in general, the recast analysis does not add anything to what already probed through the actual one.</p
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