39 research outputs found

    Recent results on CP violation at B factories

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    International audienceWe review recent results of the Beauty Factories BaBar and Belle on CP violation in the quark sector and constraints on the CKM unitarity triangle. We first present the recent measurement, using BaBar and Belle data, of cos(2β) = cos(2ϕ1_{1}) in B0^{0} → D(∗)^{(∗)}h0^{0} with D→K0Sπ+π−D \rightarrow {K^{0S}} \pi ^{+} \pi ^{-} decays, using a combined time-dependent Dalitz plot analysis. The BaBar Dalitz plot analysis of the B+→K0Sπ+π0B^{+} \rightarrow {K^{0S}} \pi ^{+} \pi ^{0} decay is also presented, and shows an evidence for direct CP violation in B+^{+} → K∗^{∗}(892)π0^{0}. A recently published BaBar measurement of the |Vub_{ub}| CKM matrix element allows to contrain one side of the unitarity triangle. These analyses use the data sets of the BaBar and Belle experiments containing 471 × 106^{6} and 772 × 106^{6} BB‾B\overline {B} pairs collected at the Υ(4S) resonance at the asymmetric-energy B factories PEP-II at SLAC and KEKB at KEK, respectively

    Study of three-body charmonium decays in BABAR

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    International audienceThe processes γ γ → K 0 S K ± π ∓ and γ γ → K + K − π 0 are studied using a data sample of 519 fb − 1 recorded with the B A B AR detector operating at the SLAC PEP-II asymmetric-energy e + e − collider at center of mass energies at and near the Υ (n = 2, 3, 4) resonances. In both final states we observe η c decays and Dalitz plot analyses are performed using a model- independent partial wave tech- nique. This allows a model-independent measurement of the m ass-dependence of the I = 1 2 K π S-wave amplitude and phase. This measurement is compared to those from previous experiments and the phase shows similar behavior for up to a mass of 1.5 GeV /c 2 but the amplitudes exhibit very marked differences. The presence of a new a 0 (1950) resonance is required by the data with m = 1931 ± 14 ± 22 MeV/c 2 and Γ = 271 ± 22 ± 29 MeV

    Feuille de route pour la physique des deux infinis

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    En avril 2012, durant les journées de prospective des instituts IN2P3 du CNRS et IRFU du CEA, les chercheurs et ingénieurs ont exposé et débattu de leurs recommandations aux directions des instituts afi n d’établir une feuille de route en physique nucléaire, en physique des particules et des astroparticules, en France pour les dix années à venir. Cette réunion consacrait une année de préparation approfondie et de rédaction de documents par différents groupes de travail. Concernant la physique des particules, les débats et les synthèses servent de base à la suite au niveau européen : la stratégie européenne en cours d’élaboration par le Conseil du CERN

    Recent results on CP violation at B factories

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    Change in Expression of 5-HT6 Receptor at Different Stages of Alzheimer’s Disease: A Postmortem Study with the PET Radiopharmaceutical [18F]2FNQ1P

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    International audienceBackground: The 5-HT 6 receptor is one of the most recently identified serotonin receptors in the central nervous system. Because of its role in memory and cognitive process, this receptor might be implicated in Alzheimer's disease (AD) and associated disorders. Objective: The aim of this study was to investigate the binding of [ 18 F]2FNQ1P, a new specific radiotracer of 5-HT 6 receptors, and to quantify 5-HT 6 receptor density in caudate nucleus in a population of patients with different AD stages. Methods: Patients were classified according to the "ABC" NIA-AA classification. In vitro binding assays were performed in postmortem brain tissue from the healthy control (HC; n = 8) and severe AD ("High"; n = 8) groups. In vitro quantitative autoradiography was performed in human brain tissue (caudate nucleus) from patients with different stages of AD: HC (n = 15), "Low" (n = 18), "Int" (n = 20), and "High" (n = 15). Results: In vitro binding assays did not show significant differences for the K D and B max parameters between "High" and HC groups. In vitro quantitative autoradiography showed a significant difference between the "High" and HC groups (p = 0.0025). We also showed a progressive diminution in [ 18 F]2FNQ1P specific binding, which parallels 5-HT 6 receptors expression, according to increasing AD stage. Significant differences were observed between the HC group and all AD stages combined ("Low", "Intermediate", and "High") (p = 0.011). Conclusion: This study confirms the interest of investigating the role of 5-HT 6 receptors in AD and related disorders. [ 18 F]2FNQ1P demonstrated specific binding to 5-HT 6 receptors

    La fin du IVe millénaire dans le bassin parisien

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    Le “Seine-Oise-Marne” n’avait pas fait l’objet d’une nouvelle analyse depuis les travaux de G. Bailloud en 1974. Peu de collections issues de sépultures collectives avaient été étudiées intégralement et le domaine domestique était à documenter. Cet ouvrage comporte une série d’articles, visant à combler cette lacune à partir d’études thématiques ciblées entre Picardie, Île-de-France et Champagne. Ce travail a été mené dans le cadre d’un Programme collectif de recherche du ministère de la Culture entre 2001 et 2008. Il en présente la version la plus aboutie, alimentée par de nouveaux résultats d’études qui ont pris en compte tous les aspects de la culture matérielle et une diversité de contextes de découvertes tant domestiques que funéraires. Il propose une image synthétique du Néolithique récent dans le Bassin parisien qui prend place dans la deuxième moitié du IVe millénaire avant notre ère (-3500/-2900). La confrontation des données conduit à préciser la chronologie de cette période, découpée désormais en trois étapes. Les caractéristiques des assemblages mobiliers permettent d’esquisser les contours de trois faciès régionaux qui se développent durant l’étape moyenne du Néolithique récent.The “Seine-Oise-Marne” Neolithic cultural complex has not benefited from any new analysis sincethe work of Gerard Bailloud in 1974. Few assemblages from collective burials have been comprehensively studied, and many aspects of domestic life still remained to be documented. This volume aims to overcome these lacunae, by presenting a senes of thematic studies originating from the regions of Picardie, Ile-de-France and Champagne. These studies were undertaken in the framework of a Collective Research Programme (PCR) of the French Ministry of Culture between 2001 and 2008. We present here the latest achievements of this programme, drawing on recent research results which take into account all relevant aspects of material culture, including the diverse contexts, both domestic and funerary, in which they were found. Ultimately, this volume proposes a synthetic picture of the recent Neolithic period in the Paris basin, during the second half of the 4th millennium BCE (-3500/-2900). The comparative study of the assembled data leads us to refine the chronological framework of the period into three stages. Moreover, the characteristics of the assemblages enable us to outline the development of three regional facies during the middle phase of the recent Neolithic
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