410 research outputs found

    Charm semileptonic decays at the B factories

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    A review of charm semileptonic decays results obtained at B factories is presented. It focuses on form factors measurements in D0→K−ℓ+ÎœD^0\to K^- \ell^+ \nu, D0→π−ℓ+ÎœD^0\to \pi^- \ell^+ \nu, Ds+→K+K−e+ÎœeD_s^+ \to K^+K^- e^+\nu_e, and D+→K−π+e+ÎœeD^+ \to K^-\pi^+ e^+\nu_e. For the last two decay channels, the contribution and characteristics of other components in the final state, in addition to the main vector contribution, is also studied

    Recent results on semileptonic decays at Babar

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    Some recent Babar results on semileptonic decays are presented. They focus on the determination of the CKM matrix elements |V_{ub}| and |V_{cb}| in inclusive and exclusive b --> u l nu and b--> c l nu decays, and on form factors measurement in exclusive c--> s l nu decays.Comment: 4 pages, 1 figure, contributed to the proceedings of QCD 08 Montpellier, France, 7-12th July 200

    Summary of the CKM 2016 working group on rare decays

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    Rare BB, DD, and KK decays offer unique opportunities to probe for evidence of new particles from physics beyond the Standard Model at mass scales extending from the electroweak scale to well above those directly accessible at the LHC. We review a selection of theoretical and experimental results on rare BB, DD, and KK decays illustrating the progress made during the past two years.Comment: 15 pages, 3 figures. To appear in the proceedings of the 9th International Workshop on the CKM Unitarity Triangle, Nov 28- Dec 2 2016, Mumba

    Rare bb-hadron decays

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    Le Cénozoïque du bassin de Paris : un enregistrement sédimentaire haute résolution des déformations lithosphériques en régime de faible subsidence

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    International audienceLe bassin de Paris est considĂ©rĂ© comme un exemple typique de bassin intracratonique affectĂ© par une subsidence thermique long terme. Le CĂ©nozoĂŻque correspond Ă  une pĂ©riode de faible subsidence (Ă©paisseurs infĂ©rieures Ă  350m) et marque la fin du fonctionnement de ce bassin. C’est en outre une pĂ©riode de forte dĂ©formation de la plaque europĂ©enne, dans un contexte de convergence Afrique-Eurasie et d’ouverture de l'Atlantique Nord caractĂ©risĂ©e par des inversions de grabens dans le Nord et l’Est de l’Europe. Si de nombreux hiatus ont Ă©tĂ© identifiĂ©s, les dĂ©formations cĂ©nozoĂŻques du bassin de Paris, situĂ©es sur une croute Ă  l’équilibre et leur relation aux contraintes en limite de plaque restent mĂ©connues. Cette thĂšse a pour objectif de recomposer Ă  haute rĂ©solution spatiale et temporelle (de l’ordre du million d’annĂ©es) les gĂ©omĂ©tries sĂ©dimentaires 3D et les palĂ©ogĂ©ographies successives du PalĂ©ocĂšne au dĂ©but de l’OligocĂšne. Ce travail qui s’appuie sur de nombreuses donnĂ©es biostratigraphiques consiste en une approche couplĂ©e de sĂ©dimentologie de faciĂšs et de corrĂ©lations diagraphiques (500 puits) selon les principes de la stratigraphie sĂ©quentielle. Trois ordres de sĂ©quences sont dĂ©finis. Les cycles d’ordre supĂ©rieur (4Ăšme et 3Ăšme ordre) enregistrent les variations climato-eustatiques. Cinq sĂ©quences de dĂ©pĂŽt (2e ordre), limitĂ©es par des discontinuitĂ©s et/ou des rĂ©organisations palĂ©ogĂ©ographiques sont identifiĂ©es : (1) Maastrichtien-Danien ; (2) ThanĂ©tien-YprĂ©sien ; (3) LutĂ©tien-Bartonien ; (4) Bartonien-Priabonien terminal et (5) Priabonien terminal-Chattien. Les architectures des sĂ©quences (1) Ă  (4) sont contrĂŽlĂ©es par des phases de flexures. AprĂšs des Ă©mersions lors des paroxysmes de flexuration, la relaxation progressive des flexures se traduit tout d’abord par la mise en place de profils pentĂ©s et ouverts, puis par des profils de plus en plus plats et confinĂ©s associĂ©s Ă  une transgression gĂ©nĂ©ralisĂ©e. Du ThanĂ©tien au Bartonien s’observent des flexures d’axe E-W, dont les Ăąges sont compatibles avec les diffĂ©rentes phases de la convergence IbĂ©rie-Eurasie. En outre, une dĂ©formation de courte durĂ©e Ă  l’YprĂ©sien basal est rattachĂ©e Ă  l'ouverture de l'Atlantique Nord. Enfin, une rĂ©orientation majeure du bassin possiblement liĂ©e au dĂ©but de la collision Apulie-Eurasie est observĂ©e au Priabonien. Ce travail fournit un calage Ă  haute rĂ©solution pour la comprĂ©hension et la modĂ©lisation des dĂ©formations intraplaques. DiffĂ©rentes tailles de flexure, de l’ordre de 150 Ă  plus 300 km sont observĂ©es traduisant une implication d’épaisseurs plus ou moins importantes de la lithosphĂšre

    Development and Potential Usefulness of the COVID-19 Ag Respi-Strip Diagnostic Assay in a Pandemic Context

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    Introduction: COVID-19 Ag Respi-Strip, an immunochromatographic (ICT) assay for the rapid detection of SARS-CoV-2 antigen on nasopharyngeal specimen, has been developed to identify positive COVID-19 patients allowing prompt clinical and quarantine decisions. In this original research article, we describe the conception, the analytical and clinical performances as well as the risk management of implementing the COVID-19 Ag Respi-Strip in a diagnostic decision algorithm. Materials and Methods: Development of the COVID-19 Ag Respi-Strip resulted in a ready-to-use ICT assay based on a membrane technology with colloidal gold nanoparticles using monoclonal antibodies directed against the SARS-CoV and SARS-CoV-2 highly conserved nucleoprotein antigen. Four hundred observations were recorded for the analytical performance study and thirty tests were analyzed for the crossreactivity study. The clinical performance study was performed in a retrospective multicentric evaluation on aliquots of 328 nasopharyngeal samples. COVID-19 Ag Respi-Strip results were compared with qRT-PCR as golden standard for COVID-19 diagnostics. Results: In the analytical performance study, the reproducibility showed a between-observer disagreement of 1.7%, a robustness of 98%, an overall satisfying user friendliness and no cross-reactivity with other virus-infected nasopharyngeal samples. In the clinical performance study performed in three different clinical laboratories during the ascendant phase of the epidemiological curve, we found an overall sensitivity and specificity of 57.6 and 99.5%, respectively with an accuracy of 82.6%. The cut-off of the ICT was found at CT < 22. User-friendliness analysis and risk management assessment through Ishikawa diagram demonstrate that COVID-19 Ag Respi-Strip may be implemented in clinical laboratories according to biosafety recommendations. Conclusion: The COVID-19 Ag Respi-Strip represents a promising rapid SARS-CoV-2 antigen assay for the first-line diagnosis of COVID-19 in 15min at the peak of the pandemic. Its role in the proposed diagnostic algorithm is complementary to the currently-used molecular techniques

    LSST: from Science Drivers to Reference Design and Anticipated Data Products

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    (Abridged) We describe here the most ambitious survey currently planned in the optical, the Large Synoptic Survey Telescope (LSST). A vast array of science will be enabled by a single wide-deep-fast sky survey, and LSST will have unique survey capability in the faint time domain. The LSST design is driven by four main science themes: probing dark energy and dark matter, taking an inventory of the Solar System, exploring the transient optical sky, and mapping the Milky Way. LSST will be a wide-field ground-based system sited at Cerro Pach\'{o}n in northern Chile. The telescope will have an 8.4 m (6.5 m effective) primary mirror, a 9.6 deg2^2 field of view, and a 3.2 Gigapixel camera. The standard observing sequence will consist of pairs of 15-second exposures in a given field, with two such visits in each pointing in a given night. With these repeats, the LSST system is capable of imaging about 10,000 square degrees of sky in a single filter in three nights. The typical 5σ\sigma point-source depth in a single visit in rr will be ∌24.5\sim 24.5 (AB). The project is in the construction phase and will begin regular survey operations by 2022. The survey area will be contained within 30,000 deg2^2 with ÎŽ<+34.5∘\delta<+34.5^\circ, and will be imaged multiple times in six bands, ugrizyugrizy, covering the wavelength range 320--1050 nm. About 90\% of the observing time will be devoted to a deep-wide-fast survey mode which will uniformly observe a 18,000 deg2^2 region about 800 times (summed over all six bands) during the anticipated 10 years of operations, and yield a coadded map to r∌27.5r\sim27.5. The remaining 10\% of the observing time will be allocated to projects such as a Very Deep and Fast time domain survey. The goal is to make LSST data products, including a relational database of about 32 trillion observations of 40 billion objects, available to the public and scientists around the world.Comment: 57 pages, 32 color figures, version with high-resolution figures available from https://www.lsst.org/overvie

    Medusa y otros cuentos

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    Este libro reĂșne el esmerado trabajo creativo de los estudiantes de la electiva “El arte de escribir y la creaciĂłn de mundos” (2017) de la Universidad CatĂłlica de Colombia, un espacio acadĂ©mico dedicado al estudio de textos literarios y de las herramientas del lenguaje para la creaciĂłn narrativa. Este espacio, organizado y apoyado incansablemente por la DirecciĂłn de Bienestar Universitario, promueve y cultiva el difĂ­cil arte de la escritura en los estudiantes de la Universidad. En esta publicaciĂłn el lector podrĂĄ hallar mĂĄs que un ejercicio acadĂ©mico, la exteriorizaciĂłn de las inquietudes artĂ­sticas de la comunidad universitaria, las voces de una generaciĂłn de estudiantes, un esfuerzo plĂĄstico, un juego de figuras e imĂĄgenes; en fin, los resultados de varios procesos creativos.MEDUSA/WILLIAM BALLÉN MARTÍNEZ. DÍA UTÓPICO/TANIA LUCÍA FONSECA. LA BELLEZA, EL DESTINO Y LA MUERTE EN URUK /NATALIA ISABEL SERRANO CRUZ. SOLO UNA CASUALIDAD/MARÍA CAMILA CASTELLANOS ESCOBAR. HISTORIA DE CACHOS/ EDWIN LEANDRO SUÁREZ GALINDO. EL BUS/ISABEL ORTEGA BENAVIDES. EL PISCO QUE ROBÓ MI ZAPATO/KATTY DAYANNA VALENCIA BANGUERA. ERA SOLO UNA ILUSIÓN/ERIKA DANIELA OROZCO GÓMEZ. MIS DÍAS DE OLVIDO/LUISA FERNANDA CELIS RAMÍREZ. ALMAS: EL HOMBRE QUE NO PUDO SER AMADO/JUSTINE VALENTINA BÁEZ LEÓN. CONSANGUINIDAD: UN FINAL SIN HISTORIA/CARLOS CÉSAR BRICEÑO RAMÍREZ.1a
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