1,721,225 research outputs found
Measurement of the e+e− → π+π−π+π−, K+K−π+π−, K+K−K+K− Cross Sections Using Initial State Radiation at BABAR
No full textFirst results of a study of the e+e− → π+π−π+π−γ process with hard photon emitted from initial state are presented. About 60000 fully reconstructed events have been selected based on 89.3 fb−1 of BABAR data. The invariant mass of the hadronic final state defines the effective collision c.m. energy, and so BABAR ISR data can be compared to the relevant direct e+e− measurements. From obtained 4π mass spectrum we evaluate e+e− → π+π−π+π− cross section for the range of c.m.s. energy from 0.6 to 4.5 GeV. The systematic error of the cross section measurement is 5% and comparable with the best e+e− data. The cross sections for identified 2K2π and 4K final states also have been presented
A case study for the handling of data in a skimming control system
No full textThis work focuses on the architectural, methodological and technological aspect of handling huge amounts of data. In this summary we particularly focus our attention on the description of a special system built to support large scale data access. The work comes from the need to develop a special purpose skimming control system; this system has been designed as a collaboration between the Stanford Linear Accelerator Center (SLAC, USA), and the Istituto Nazionale di Fisica Nucleare (INFN, National Istitute of Nuclear Physic, Padua, Italy). The goal was to provide the handle of more than 10^7 files, representing Physics data collected by the BaBar experiment
Hadronic physics studies at BaBar
No full textA new resonance, Y(4260) with a mass of 4259 +/- 8(-6)(+2) MeV/c(2) and J(PC) = 1(--), discovered by the BaBar experiment shows peculiar behavior in his decay mode. The Lambda(c)(+) baryon mass has been measured, using its decays to Lambda (KSK+)-K-0 and Sigma(0)K(S)(0)K(+), and its value is 2286.46 +/- 0.14 MeV/c(2), the precision is greatly improved w.r.t. PDG value. E' and Q0 decays and production have been studied with results greatly improved w.r.t. PDG
Simulation of different ep reactions in HERWIG
No full textAn overview is given of the available generators for the ep reaction, as they are implemented in the general purpose Monte Carlo HERWIG.
Deep Inelastic Scattering, boson-gluon fusion, J/psi production, photoproduction reactions will be dealt with, focusing on the unique features of the Marchesini-Webber description for the parton cascade development in both time-like and space-like domains.
We will concentrate mainly on the enrgy range of HERA, which will offer the next physics oppotunities for the ep scattering. A comparison with the previous data from the European Muon Collaboration experiment will be also presented
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
Silicon Photomultipliers: Characterization and Radiation Hardnessfor the SuperB Detector
No full textIn this paper measurements of SiPM properties
will be presented: SiPM characteristics of devices produced
by different manufacturers, and a study on radiation damage
induced by neutrons irradiation
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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