1,721,078 research outputs found
Muon Pair Production in e-p Collisions at HERA
No full textCross sections for the production of two isolated muons up to high di-muon masses are measured in ep collisions at HERAwith the H1 detector in a data sample corresponding to an integrated luminosity of 71 pb.1 at a centre of mass energy of ¡Ìs = 319 GeV. The results are in good agreement with Standard Model predictions, the dominant process being photon ̈Cphoton interactions. Additional muons or electrons are searched for in events with two high transverse momentum muons usingthe full data sample corresponding to 114 pb.1, where data at ¡Ìs = 301 GeV and ¡Ìs = 319 GeV are combined. Both thedi-lepton sample and the tri-lepton sample agree well with the predictions
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
Measurement of Dijet Cross Sections in ep Interactions with a Leading Neutron at HERA
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Search for Bosonic Stop Decays in R-Parity Violating Supersymmetry in e^+p Collisions at HERA
No full textA search for scalar top quarks in R-parity violating supersymmetry is performed in e+p collisions at HERA using the H1detector. The data, taken at ãs = 319 GeV and 301 GeV, correspond to an integrated luminosity of 106 pb-1. The resonantproduction of scalar top quarks ̃t in positron quark fusion via an R-parity violating Yukawa coupling λ_ is considered with thesubsequent bosonic stop decay ̃t ̈ ̃bW. The R-parity violating decay of the sbottom quark ̃b ̈d ̄νe and leptonic and hadronicW decays are considered. No evidence for stop production is found in the search for bosonic stop decays nor in a searchfor the direct R-parity violating decay ̃t ̈eq. Mass dependent limits on λ_ are obtained in the framework of the minimalsupersymmetric Standard Model. Stop quarks with masses up to 275 GeV can be excluded at the 95% confidence level for aYukawa coupling of electromagnetic strength
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
Measurement of Anti-Deuteron Production and a Search for Heavy Stable Charged Particles at HERA
No full textThe cross section for anti-deuteron photoproduction is measured at HERA at a mean centre-ofmassenergy of Wãp = 200 GeV in the range 0.2 < pT/M < 0.7 an
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
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