1,720,988 research outputs found
Anomalies, U(1)' and the MSSM
Full text linkQuesta Tesi analizza un'estensione del MSSM tramite l'aggiunta di un multipletto vettoriale abeliano anomalo
e contiene alcuni risultati originali riguar- danti la fenomenologia di uno anomalo.
La parte di rassegna presenta un'introduzione sul MSSM e le sue caratteristiche principali, una discussione
sulle anomalie chirali e come cancellarle nel Modello Standard e tramite il meccanismo di Green-Schwarz.
Quindi, vengono presentati i risultati originali. Costruiamo la Lagrangiana per la ``Minimal Anomalous U(1)'Extension of the MSSM'', dove le anomalie sono cancellate con il meccanismo di Green-Scharwz e l'aggiunta dei termini di Chern-Simons, sottolineando
le principali caratteristiche tra il nostro modello e il MSSM.
Il vantaggio di questa scelta rispetto alla standard è che permette valori arbitrari dei numeri quantici dell'extra U(1).
Come primo passo verso lo studio delle collisioni adroniche che producono 4 leptoni nello stato finale
(un segnale chiaro che potrebbe essere studiato a LHC) calcoliamo quindi i decadimenti Z'\to Z_0 \gamma and Z'\to Z_0 Z_0.
Troviamo che i valori più grandi per i tassi di decadimento sono sim 10^{-4} GeV, mentre il numero previsto di eventi
all'anno in LHC è al massimo dell'ordine di 10. Quindi calcoliamo la densità residua predetta dal nostro modello con un
nuovo candidato di materia oscura, l'axino, che è la LSP della teoria. Notiamo che l'accordo con i dati sperimentali
implica l'assunzione che la NLSP sia una particella ``bino-like'' quasi degenere in massa con l'axino.This Thesis reviews an extension of the MSSM by the addition of an anomalous abelian vector multiplet and contains
some original results concerning the phenomenology of an anomalous Z'.
The review part covers an introduction of the MSSM focusing on its main features, a discussion on the chiral
anomalies and how to cancel them in the Standard Model and by the Green-Schwarz mechanism.
Then, the original results are presented. We build the Lagrangian for the Minimal Anomalous U(1)' Extension of the MSSM where
the anomalies are cancelled by the Green-Schwarz mechanism and the addition of Chern-Simons terms,
stressing the main differences between our model and the MSSM.
The advantage of this choice over the standard one is that it allows for arbitrary values of the quantum numbers
of the extra U(1). As a first step towards the study of hadron annihilations producing four leptons in the final
state (a clean signal which might be studied at LHC) we then compute the decays Z'\to Z_0 \g and Z'\to Z_0 Z_0.
We find that the largest values of the decay rate are \sim 10^{-4} GeV, while the expected number of
events per year at LHC is at most of the order of 10.
Then we compute the relic density predicted by our model with a new dark matter candidate, the axino,
which is the LSP of the theory.
We see that agreement with experimental data implies the assumption that the NLSP is a bino-like particle almost
degenerate in mass to the axino
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
A cloud-based approach for analyzing viral propagation of linguistic deviations by social networking: Current challenges and pitfalls for text analysis tools
No full textSocial Networks activities offer rooms a non-trivial testbed for linguistic analysis, introducing significant revolutions into the creation of textual content. Linguistic solecisms, blunders, and generally speaking deviations from standard linguistic norms, are becoming the rule rather than the exception. Social Networks instantly and virally propagate deviations among users, who are increasingly moving away from standard language usage. Performing text analysis on deviated textual documents is a challenging and hard task. In this work, we propose an approach supporting text analysis tasks against a set of deviated textual documents. It exploits a “linguistic blundersonomy”, a taxonomy of linguistic deviations, progressively built by processing textual Big Data provided by social network, in a Cloud-Based environment (SAP-HANA). A preliminary case study for Italian language is presented, showing how the exploitation of a linguistic blundersonomy could improve the precision of a sentiment and opinion mining process, and more generally, of a text analysis process
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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
What's the Matter with Cultural Heritage Tweets? An Ontology - Based Approach for CH Sensitivity Estimation in Social Network Activities
No full textIn 2015, Twitter introduced the hashtag #culturalheritage, thus giving an empirical evidence of the increasing interest of users towards cultural topics and events. In the last years, while an increasing number of studies and initiatives about tweets, in both the academic and business worlds, raised, a lack of quantitative studies devoted to assess their potential and effectiveness for organizations promoting Cultural Heritage was recorded. So, this work describes a quantitative analysis of tweets which combines NLP, semantic technologies, geo-referencing and temporal analysis. The initial set of measures aims to characterize people's interest and sensitivity into CH subjects, geographical density of CH resources, and temporal proximity to CH-related events. Furthermore, in order to evidence the relevance of the obtained results, they are compared to similar measures computed for different but more general topics - such as Medicine - while at the same time entail a certain specificity of interest, which cannot be confused with reactions to common mainstream, glamour or massive-impressive events (earthquakes, political elections, wars, amazing news). This kind of analysis was focused on huge datasets of tweets, issued in a long period of time from geographical areas of Italy having different densities of CH resources, The results encourage and sustain a Business-Intelligence approach which is suitable for both no-profit ad business oriented organizations, such as those involved in the DATABENC District
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