1,720,987 research outputs found
Measurement of the branching ratio and search for a CP violating asymmetry in the eta ---> pi+ pi- e+ e-(gamma) decay at KLOE
No full textWe have studied the eta→pi+pi-e+e-(gamma) decay using about 1.7 fb−1 collected by the KLOE experiment at the DAFNE phi-factory. This corresponds to about 72 millions eta mesons produced in phi radiative decays. We have measured the branching ratio, inclusive of radiative effects, with 4% accuracy: BR(eta→ pi-pi-e+e-(gamma) = (26.8 ± 0.9Stat. ± 0.7Syst.) × 10^−5. We have obtained the first measurement of the CP-odd pipi-ee decay planes angular asymmetry, Aphi = (−0.6±2.5Stat. ±1.8Syst.)×10^−2
Measurement of sigma(e + e- ---> pi+ pi- gamma(gamma) and the dipion contribution to the muon anomaly with the KLOE detector.
No full textWe have measured the cross section σ(e+e− → pi+pi−>γ(γ)) at DAΦNE, the Frascati φ–factory, using events with initial state radiation photons emitted at small angle and inclusive of final state radiation. We present the analysis of a new data set corresponding to an integrated luminosity of 240 pb−1. We have achieved a reduced systematic uncertainty with respect to previously published KLOE results. From the cross section we obtain the pion form factor and the contribution to the muon magnetic anomaly from two-pion states in the mass range 0.592 < Mππ < 0.975 GeV. For the latter we find ∆pipiaμ=(387.2±0.5stat±2.4exp±2.3th)×10−10
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
Measurements of properties of the Higgs-like Particle at 125 GeV by the CMS collaboration
No full textCMS results on the measurement of properties of the Higgs-like particle discovered last summer with a mass near 126 GeV are presented. The results are based on a data samples corresponding to an integrated luminosity of up to 5.1 fb-1 at 7 TeV and up to 19.6 fb-1 at 8 TeV in proton-proton collisions at the LHC. Five decay modes are studied: gamma-gamma, ZZ, WW, tau-tau and bb. The event yields obtained by different analyses targeting specific decay modes and production mechanisms are consistent with those expected for the Standard Model (SM) Higgs boson. The mass of the new boson is measured to be 125.7 +- 0.4 GeV. The best-fit signal strength for all channels combined, expressed in units of the SM Higgs boson cross section, is 0.80 +- 0.14 at the measured mass. A discussion on the consistency of the couplings and the spin-parity properties of the observed boson with those predicted for the SM Higgs boson is presented, updated with the most recent results. No significant deviations are found.CMS results on the measurement of properties of the Higgs-like particle discovered last summer with a mass near 126 GeV are presented. The results are based on a data samples corresponding to an integrated luminosity of up to 5.1 fb-1 at 7 TeV and up to 19.6 fb-1 at 8 TeV in proton-proton collisions at the LHC. Five decay modes are studied: gamma-gamma, ZZ, WW, tau-tau and bb. The event yields obtained by different analyses targeting specific decay modes and production mechanisms are consistent with those expected for the Standard Model (SM) Higgs boson. The mass of the new boson is measured to be 125.7 +- 0.4 GeV. The best-fit signal strength for all channels combined, expressed in units of the SM Higgs boson cross section, is 0.80 +- 0.14 at the measured mass. A discussion on the consistency of the couplings and the spin-parity properties of the observed boson with those predicted for the SM Higgs boson is presented, updated with the most recent results. No significant deviations are found
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