1,721,524 research outputs found
Measurement of the Polarisation of the W Boson and Application to Supersymmetry Searches at the Large Hadron Collider
Full text linkThis thesis gives an account of two analyses performed using data from
the Compact Muon Solenoid experiment at the Large Hadron Collider.
The first analysis measures the polarisation of W bosons with large
transverse momentum using 36 pb⁻¹ of data collected in 2010. The second
applies similar techniques to a search for supersymmetry in events
containing a single lepton, jets and missing transverse energy. This analysis
utilises 1.14 fb⁻¹ of data collected up to 2011. Background material
related to the Standard Model, supersymmetry and the experimental
apparatus are reviewed in detail.
The W polarisation measurement is performed in both the W->ev
and W->μv channels. The expected effect, a large dominance of
the left-handed over the right-handed helicity state, is observed with
a significance of 7.8σ for the W⁺ and 5.1σ for the W⁻ in the muon
channel. Similar results are found in the electron channel and for a
combined fit to both lepton channels.
The second analysis conducts a search for supersymmetry in events
containing a single lepton, jets and missing transverse energy. The
search employs techniques developed for the W polarisation measurement
to separate supersymmetry from Standard Model backgrounds. No
deviation from the Standard Model is observed. A detailed statistical
interpretation is performed and used to set limits within the Constrained
Minimal Supersymmetric Standard Model as well as two simplified
models
The CMS Journey to LHC Physics
No full textAn overview of the design, the construction and physics of CMS will be given.
A history of construction, encompassing the R&D and challenges faced over the last decade and a half, will be recalled using selected examples. CMS is currently in the final stages of installation and commissioning is gathering pace. After a short status report of where CMS stands today some of the expected (great) physics to come will be outlined.
* Tea & coffee will be served at 16:00.</i
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
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