1,720,968 research outputs found
Probing the tau lepton magnetic moment at future lepton colliders
Full text linkThe anomalous magnetic moments of leptons are excellent candidates not only to test the Standard Model predictions, but also to investigate possible new physics effects. The long-standing discrepancy between the Standard Model prediction and the experimental measure of the muon g − 2 motivates the study of non-standard effects also in the electron and tau g − 2. In our work, we show the potential sensitivity of future lepton colliders (FCC-ee or a high-energy Muon Collider) to probe the tau g − 2. We point out that these facilities can generate processes like the radiative Higgs decay h —> T+T- Y or the Drell-Yan processes l+l- —> T+T- (h) enabling to test the tau g − 2 with a resolution of O (10-5 - 10-4) that is orders of magnitude better than the current LEP sensitivity
Flavour constraints on light spin-1 bosons within a chiral Lagrangian approach
Full text linkWe discuss the construction of the chiral Lagrangian for a light spin-1 boson, here denoted as X, featuring both vector and axial-vector couplings to light u, d, s quarks. Focusing on ∆S = 1 transitions, we show that there are model-independent tree-level contributions to K ± → π ± X, sourced by Standard Model charged currents, which receive an mK2/mX2 enhancement from the emission of a longitudinally polarized X. This flavour observable sets the strongest to date model-independent bound on the diagonal axial-vector couplings of X to u, d, s quarks for mX < mK – mπ, superseding the bounds arising from beam-dump and collider searches
Low-energy flavour probes of light vector bosons
Full text link. - In this work, we construct the chiral Lagrangian for a light spin-1 boson X possessing both vectorial and axial couplings to the light Standard Model quarks u, d, s. We then use it in order to describe the tree-level, model-independent contributions to the Delta S = 1 transition K +/- -> pi +/- X, which is induced by Standard Model charged currents and is possibly enhanced by the emission of a longitudinally polarized X boson. Such a flavour observable is then shown to set the best modelindependent bounds on the diagonal axial couplings of X to light quarks in the mass range allowed by the decay kinematics, improving the currently available constraints from beam-dump experiments and collider searches
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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