1,720,973 research outputs found
Status of ttH and tH searches
No full textThe production of a Higgs boson in association with top quark pairs (ttH) or single top quarks (tH) is the direct way to observe the top-Yukawa coupling at the LHC. In contrast to the production of a Higgs boson via gluon-gluon-fusion or the decay of the Higgs boson into two photons, where the top quark contributes significantly to both processes through loop diagrams, no assumptions on other particles or BSM physics have to be made. This presentation reviews the latest results on searches for ttH and tH production by the ATLAS and CMS collaborations. In order to observe these rare Higgs boson production modes, heavy usage of multivariate analysis techniques is necessary to increase the sensitivity.</p
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
Associated single top production (t+X)
No full textSingle top quark production in association with vector bosons providesa unique way to probe the electroweak sector of the standard model atthe Large Hadron Collider. In this talk the latest experimental results of the ATLAS and CMS Collaborations for these processes are presented.Single top quark production in association with vector bosons provides a unique way to probe the electroweak sector of the standard model at the Large Hadron Collider. In this talk the latest experimental results of the ATLAS and CMS Collaborations for these processes are presented
Top quark mass and cross section at ATLAS and CMS
No full textThe top quark is the heaviest elementary particle known to date and therefore an important topic to study in the context of the standard model at the LHC. In this contribution the latest measurements of top quark production cross sections and the top quark mass at the LHC by the ATLAS and CMS Collaborations are presented
Top quark mass and cross section at ATLAS and CMS
Full text linkThe top quark is the heaviest elementary particle known to date and therefore
an important topic to study in the context of the standard model at the LHC. In
this contribution the latest measurements of top quark production cross
sections and the top quark mass at the LHC by the ATLAS and CMS Collaborations
are presented.Comment: contribution to the 2024 QCD session of the 58th Rencontres de
Morion
Single top t-channel
No full textThe production of single top quarks allows to study the interplay of top quark physics and the electroweak sector of the standard model. Deviations from predictions can be a hint for physics beyond the standard model. The t-channel is the dominant production mode for single top quarks at the LHC. This talk presents the latest measurements from the ATLAS and CMS collaborations.The production of single top quarks allows to study the interplay of top quark physics and the electroweak sector of the standard model. Deviations from predictions can be a hint for physics beyond the standard model. The t-channel is the dominant production mode for single top quarks at the LHC. This talk presents the latest measurements from the ATLAS and CMS collaborations
Cross section measurement of -channel single top quark production in pp collisions at = 13 TeV
No full textThe electroweak production of single-top quarks in the t-channel can be changed by any deviation from the Standard Model, it is therefore an excellent opportunity to search for new physics. In this poster the recent cross-section measurement of the CMS collaboration is presented with the full 2015 dataset of the LHC Run II at a center-of-mass energy of 13 TeV. The cross section and the top/antitop ratio is extracted using a binned maximum likelihood fit to the distribution of a multivariate classifier in events containing one isolated muon in the final state.Single top quarks in the channel are produced though the electroweak force and are therefore an excellent way to probe the electroweak sector of the standard model with top quark physics. The recent cross section measurement of single top -channel production from the CMS collaboration is presented in this poster. The analyzed data was taken during the LHC Run II in 2015 at a center-of-mass energy of . A multivariate classifier is used to distinguish signal and background processes and the cross section is then extracted using a binned maximum-likelihood fit
- …
