Beyond CP violation: hadronic physics at BaBar

I report on recent studies of hadronic physics performed by the BaBar Collaboration. Emphasis is given to the measurement of the properties of newly discovered charmed hadrons and to the searches for light and heavy pentaquarks.Comment: 14 pages, 20 postscript figues, contributed to the Proceedings of the First APS Topical Group Meeting on Hadron Physics, Fermilab, Batavia, IL (October 24-26, 2004

A Resource Based View of the Information Systems Sourcing Mode

This paper studies the relationships between the choice of a sourcing mode for information systems, the value of the resources used in systems development activities and the presence of those resources at sufficient level within the firm. The objective is to better understand the factors underlying the decision to keep the development of an information system inside the firm or to entrust it to an outside partner. A sourcing model is proposed using the resource-based theory. Two case studies drawn from a larger study are used to illustrate the concepts used in the research model. Data from these two projects illustrate how the model could be used to predict the sourcing mode retained by the managers for each project, given the availability of the necessary resources and the strategic value of the future system. Cette recherche tente de mesurer le lien entre le mode de gestion d'une activité (gestion interne ou impartition) et la valeur de l'activité d'une part, et la présence des ressources requises dans l'entreprise d'autre part. L'objectif est de mieux comprendre les facteurs sous-jacents à une décision d'internalisation ou d'impartition d'une activité. Deux cas sont présentés. Ces cas traitent de développement de systèmes informatiques. Ils permettent d'illustrer le pouvoir explicatif du modèle. Les données illustrent bien comment le modèle proposé peut être utilisé pour prédire le mode de gestion approprié d'une activité de développement de systèmes informatique.Resource-based theory, software development, outsourcing, management of software development projects, Théorie fondée sur les compétences, développement de logiciels, impartition, gestion de projets de développement de systèmes

A Resource-Based Analysis of Outsourcing: Evidence from Case Studies

The central role that information technology plays in the management of companies, the massive investments that are required, and a preoccupation for rationalization explain in good part the renewed interest in the strategies used for information systems sourcing. In-house provision is often seen as the best way to provide an organization with IT services that are well adapted to support its business activities while preserving its trademark processes and know-how. On the other hand, critics argue that a better solution is to outsource those IT activities to specialists, thus permitting the company to focus on its core business. The choice of a sourcing mode has an impact on the ability of the firm to implement its systems and ultimately to compete in its field of business. In order to better understand under what conditions a firm should choose one sourcing mode over another, we argue that it is necessary to analyze the interactions between a firm's competencies and the strategic value of those competencies. This is investigated using evidence from 21 information system projects. The0501n findings were that the best predictor of success and failure, by far, is the fit between the governance mode and the position of the project in the value/availability matrix. Another interesting finding is that no sourcing mode per se seems to lead to successful outcomes. It is always a matter of selecting the appropriate mode for each situation. De plus en plus, les technologies de l'information sont au centre des préoccupations des gestionnaires. Elles commandent des investissements massifs et peuvent être gérées de diverses manières. Traditionnellement, une gestion interne était favorisée pour fournir à l'organisation des services sur mesure et pour protéger des pratiques uniques, permettant à l'organisation de se différencier. Les détracteurs de cette approche soutiennent que l'impartition est un meilleur choix. L'impartition permet à la firme de se concentrer sur ses compétences de bases tout en lui donnant accès à des spécialistes de pointe. Pour mieux comprendre le lien entre les compétences de la firme et l'impartition, 21 projets sont étudiés. Les résultats indiquent que le meilleur prédicteur de succès est l'adéquation entre le mode de gestion et le profil de compétences de la firme.Outsourcing of IT, resource-based theory, IT resources, Impartition, approche centrée sur les resources, étude de cas

A Resource-Based Analysis of IT Oursourcing

This paper studies the relationships between the choice of a sourcing mode for information systems, the value of the resources used in systems development activities and the presence of those resources at sufficient level within the firm. The objective is to better understand the factors underlying the decision to keep the development of an information system inside the firm or to entrust it to an outside partner. A sourcing model is proposed using the resource-based theory. A case study is used to illustrate the concepts used in the research model. Data from this case illustrate how the model could be used to predict the appropriate sourcing mode, given the availability of the necessary resources and their strategic value. Ce document étudie les liens entre le choix d'un mode de gestion (interne ou impartition) et la valeur stratégique des ressources utilisées pour la conduite de l'activité évaluée. Les éléments de base de l'approche des ressources sont présentés et un modèle d'approvisionnement est dérivé de cette approche. Un cas est utilisé pour illustrer les concepts.Resource-based theory, software development, outsourcing, management of software development projects, Théorie fondée sur les compétences, développement de logiciels, impartition, gestion de projets de développement de systèmes

Analytical modeling of demagnetizing effect in magnetoelectric ferrite/PZT/ferrite trilayers taking into account a mechanical coupling

In this paper, we investigate the demagnetizing effect in ferrite/PZT/ferrite magnetoelectric (ME) trilayer composites consisting of commercial PZT discs bonded by epoxy layers to Ni-Co-Zn ferrite discs made by a reactive Spark Plasma Sintering (SPS) technique. ME voltage coefficients (transversal mode) were measured on ferrite/PZT/ferrite trilayer ME samples with different thicknesses or phase volume ratio in order to highlight the influence of the magnetic field penetration governed by these geometrical parameters. Experimental ME coefficients and voltages were compared to analytical calculations using a quasi-static model. Theoretical demagnetizing factors of two magnetic discs that interact together in parallel magnetic structures were derived from an analytical calculation based on a superposition method. These factors were introduced in ME voltage calculations which take account of the demagnetizing effect. To fit the experimental results, a mechanical coupling factor was also introduced in the theoretical formula. This reflects the differential strain that exists in the ferrite and PZT layers due to shear effects near the edge of the ME samples and within the bonding epoxy layers. From this study, an optimization in magnitude of the ME voltage is obtained. Lastly, an analytical calculation of demagnetizing effect was conducted for layered ME composites containing higher numbers of alternated layers (). The advantage of such a structure is then discussed

Radiative and Semileptonic B Decays Involving Higher K-Resonances in the Final States

We study the radiative and semileptonic B decays involving a spin-$J$ resonant $K_J^{(*)}$ with parity $(-1)^J$ for $K_J^*$ and $(-1)^{J+1}$ for $K_J$ in the final state. Using the large energy effective theory (LEET) techniques, we formulate $B \to K_J^{(*)}$ transition form factors in the large recoil region in terms of two independent LEET functions $\zeta_\perp^{K_J^{(*)}}$ and $\zeta_\parallel^{K_J^{(*)}}$, the values of which at zero momentum transfer are estimated in the BSW model. According to the QCD counting rules, $\zeta_{\perp,\parallel}^{K_J^{(*)}}$ exhibit a dipole dependence in $q^2$. We predict the decay rates for $B \to K_J^{(*)} \gamma$, $B \to K_J^{(*)} \ell^+ \ell^-$ and $B \to K_J^{(*)}\nu \bar{\nu}$. The branching fractions for these decays with higher $K$-resonances in the final state are suppressed due to the smaller phase spaces and the smaller values of $\zeta^{K_J^{(*)}}_{\perp,\parallel}$. Furthermore, if the spin of $K_J^{(*)}$ becomes larger, the branching fractions will be further suppressed due to the smaller Clebsch-Gordan coefficients defined by the polarization tensors of the $K_J^{(*)}$. We also calculate the forward backward asymmetry of the $B \to K_J^{(*)} \ell^+ \ell^-$ decay, for which the zero is highly insensitive to the $K$-resonances in the LEET parametrization.Comment: 27 pages, 4 figures, 7 tables;contents and figures corrected, title and references revise

Graded Hecke algebras for disconnected reductive groups

We introduce graded Hecke algebras H based on a (possibly disconnected) complex reductive group G and a cuspidal local system L on a unipotent orbit of a Levi subgroup M of G. These generalize the graded Hecke algebras defined and investigated by Lusztig for connected G. We develop the representation theory of the algebras H. obtaining complete and canonical parametrizations of the irreducible, the irreducible tempered and the discrete series representations. All the modules are constructed in terms of perverse sheaves and equivariant homology, relying on work of Lusztig. The parameters come directly from the data (G,M,L) and they are closely related to Langlands parameters. Our main motivation for considering these graded Hecke algebras is that the space of irreducible H-representations is canonically in bijection with a certain set of "logarithms" of enhanced L-parameters. Therefore we expect these algebras to play a role in the local Langlands program. We will make their relation with the local Langlands correspondence, which goes via affine Hecke algebras, precise in a sequel to this paper.Comment: Theorem 3.4 and Proposition 3.22 in version 1 were not entirely correct as stated. This is repaired in a new appendi

Measurement of the branching fraction B(tau- --> K0 pi- nu) using the BaBar detector

A preliminary measurement of the branching fraction B(tau- --> K0 pi- nu) is made using 384.6 fb-1 of e+e- collision data provided by the PEP-II collider, operating primarily at sqrt(s)=10.58 GeV, and recorded using the BaBar detector. From this we measure: B(tau- --> K0 pi- nu) = (0.840 +/- 0.004 (stat) +/- 0.023 (syst)) %. This result is the most precise measurement to date and is consistent with the world average.Comment: 17 pages, 3 figures, submitted to ICHEP 200

Development of Measures to Assess Dimensions of IS Operation Transactions

Information Systems (IS) researchers often rely on organizational economics models to describe and explain various IS management issues. While those models are found to be useful, measures are yet to be proposed to assess the dimensions of IS transactions. In this paper, we present the results of a study that was a first effort toward this end. The focus of the study was on one type of transaction, IS operations, in a particular management context, that of outsouring. Measures were developed for four critical dimensions of IS operation transactions: asset specificity, measurement problem, origin of the most important investment, and governance mechanism. Data from 250 large Canadian firms were used to assess the measures, using the Partial Least Squares (PLS) technique. L'économie des organisations est souvent mise à contribution par les chercheurs en systèmes d'information (SI). Peu de travaux ont cependant proposé des instruments de mesure des dimensions transactionnelles des opérations de SI. Ce mémoire marque un pas dans cette direction. Nous proposons des instruments de mesure utiles à l'analyse de l'impartition des opérations informatiques. Quatre dimensions importantes des transactions informatiques retiennent notre attention : la spécificité des actifs, les problèmes de mesure, l'origine des investissements les plus importants et le mode de régie des transactions. Une analyse de moindres carrés partiels (Partial Least Squares) est effectuée à l'aide de données provenant de 250 grandes entreprises canadiennes.Organizational economics; Outsourcing, Économie des organisations ; Impartition ; Sous-traitance

An Evaluation of Inter-Organizational Workflow Modelling Formalisms

This paper evaluates the dynamic aspects of the UML in the context of inter-organizational workflows. Two evaluation methodologies are used. The first one is ontological and is based on the BWW (Bunge-Wand-Weber) models. The second validation is based on prototyping and consists in the development of a workflow management system in the aerospace industry. Both convergent and divergent results are found from the two validations. Possible enhancements to the UML formalism are suggested from the convergent results. On the other hand, the divergent results suggest the need for a contextual specification in the BWW models. Ce travail consiste en une évaluation des aspects dynamiques du language UML dans un contexte de workflow inter-organisationnel. Le choix du language par rapport à d'autres est motivé par sa richesse grammaticale lui offrant une très bonne adaptation à ce contexte. L'évaluation se fait par une validation ontologique basée sur les modèles BWW (Bunge-Wand-Weber) et par la réalisation d'un prototype de système de gestion de workflows inter-organisationnels. À partir des résultats convergents obtenus des deux différentes analyses, des améliorations au formalisme UML sont suggérées. D'un autre coté, les analyses divergentes suggèrent une possibilité de spécifier les modèles BWW à des contextes plus particuliers tels que ceux des workflows et permettent également de suggérer d'autres améliorations possibles au langage.Ontology, Conceptual study, Prototype Validation, UML, IS development methods and tools., Ontologie, étude conceptuelle, validation du prototype, UML, méthodes et outils de développement IS