3,656 research outputs found

    Measurement of Direct CP Asymmetries in Charmless Hadronic B Decays

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    We present recent results on time integrated and time dependent CP violation for charmless hadronic B decays using BABAR detector at the PEP-II B-factory.Comment: 7 pages, 3 postscript figues, contributed to the Proceedings of ICHEP200

    Inclusive and differential W and Z at CMS and ATLAS

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    Several electroweak precision measurements are performed by the ATLAS and CMS collaborations at the LHC. The main ones are carried out using Drell-Yan production of single W and Z boson. They regard the measurement of the production cross sections of W and Z bosons, the mass of the W boson, and sin⁡2θW\sin^2\theta_W. The results of the sin⁡2θW\sin^2\theta_W measurements have an accuracy of approximately twice that reached at LEP and SLD. Other measurements reported are about the Drell-Yan differential production cross section.Comment: Contribution to the 2019 QCD session of the 54th Rencontres de Morion

    Wage incentive profiles in dual labour markets

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    We propose a modified version of the Shapiro-Stiglitz’s (1984) efficiency wage model by introducing temporary contracts in the standard setup. New theoretical insights emerge on the incentive problem faced by workers and firms. We argue that the existence of temporary contracts broaden the incentive menu available to employers and that the optimal incentive structure can be sustained as an equi- librium outcome only if permanent contracts do not disappear. We also provide an alternative explanation of the wage penalty suffered by temporary workers even if standard models of efficiency wages would predict higher compensations for workers facing a higher job loss risk.Dual labour market, efficiency wages, wage differentials

    Measurement of W and Z production in association with jets with CMS detector

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    We present a feasibility study of the Z and W boson production in association with jets with the first LHC data recorded by CMS detector with pppp collisions at s=10\sqrt{s}=10 TeV

    Searches for the standard model Higgs boson at CMS

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    We searched for the standard model Higgs boson using approximately 5 fb−1 of 7TeV pp collisions data collected with the CMS detector at LHC. We exclude at 95% confidence level a standard model Higgs boson with mass between 127.5 and 600 GeV. The expected 95% confidence level exclusion if the Higgs boson is not present is from 114.5 and 543GeV. The most significant excess is observed at 125 GeV with a local significance of 2.8σ. The excess is consistent both with background fluctuation and a standard model Higgs boson with mass of about 125 GeV

    Measurement of angle beta with time-dependent CP asymmetry in B0->K+K-K0 decays

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    We present recent results on CP violation, and the determination of CKM angle beta, with the decay B0->K+K-K0, with BABAR and Belle detectors.Comment: 4 pages, 9 postscript figures, contributed to the Proceedings of 4th CKM workshop (2006

    Einstein-Cartan pseudoscalaron inflation

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    We study a class of early universe cosmological models based on Einstein-Cartan gravity and including a higher derivative term corresponding to a power of the Holst scalar curvature. The resulting effective action is basically given by General Relativity and an additional neutral pseudoscalar field (the pseudoscalaron), unequivocally related to the corresponding components of the torsion, that necessarily acquire a dynamics. The induced pseudoscalaron potential provides a realistic inflationary phase together with a very rich postinflationary epoch, resulting by the coupling of the pseudoscalaron to ordinary matter.Comment: 18 pages, 7 figure

    Not only a problem of fatigue and sleepiness: Changes in psychomotor performance in Italian nurses across 8-h rapidly rotating shifts

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    Although many studies have detailed the consequences of shift work in nurses concerning health, fatigue, sleepiness, or medical errors, no study has been carried out trying to disentangle the contribution of sleepiness and fatigue associated to shift work from the attentional performance. The aim of this pilot study is (A) to investigate the effects of an 8-h rapidly rotating shift on fatigue and sleepiness among staff nurses and (B) how these factors affect their psychomotor performance. Fourteen nurses were selected for a within-subject cross-sectional study according to this sequence of shifts: morning–afternoon–night, which were compared as function of tiredness, sleepiness, and performance at the Psychomotor Vigilance Task (PVT). Subsequently, a within-subject Analysis of Covariance (ANCOVA) evaluated if the observed differences between shifts persist when the contribution of sleepiness is controlled. Our results clearly indicate that night shifts are associated with significant greater sleepiness and tiredness, and worsened performance at the PVT. As hypothesized, ANCOVA showed that these differences disappear when the contribution of sleepiness is controlled. Results point to a lower psychomotor performance in night compared to day shifts that depends on sleepiness. Hence, interventions to minimize the consequences of the night shift should consider a reduction of sleepiness

    La filière étatique des semences de riz pluvial en Casamance (Sénégal) : fonctionnement, contraintes et perspectives de développement

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    Description du sujet. Dans les pays subsahariens et en particulier au Sénégal, les systèmes semenciers traditionnels représentent encore l'option la plus répandue dans l'agriculture familiale nonobstant les nombreux efforts des Etats pour développer des filières semencières modernes et économiquement durables. Objectifs. Analyser le secteur semencier formel du riz pluvial de la Casamance, une région à forte vocation rizicole où le riz représente toujours la première source alimentaire des ménages ruraux, aux niveaux organisationnel et de structuration du marché. Méthode. Les données statistiques collectées ont été élaborées pour décrire la situation de la demande/offre de semences certifiées de riz dans la sous-région et la région ciblée. A travers des entretiens semi-directifs, les acteurs principaux de la filière ont été interviewés pour identifier et analyser les maillons de la filière et combler le gap informatif venant des données quantitatives. Résultats. L'étude identifie les principales limites et contraintes ainsi que les inefficacités du système semencier formel conçu comme filière marchande mais non adapté à un contexte de subsistance où la demande commerciale finale de semences certifiées est presque nulle. Une forte dépendance des acteurs impliqués par rapport aux interventions de l'Etat et de ses partenaires techniques et financiers et le manque d'un cadre de concertation et de planification entre les différents acteurs de la chaîne semencière ont été relevés. Conclusions. La mise en oeuvre d’un système semencier intégré et d’un cadre d'actions à entreprendre pour soutenir l'intégration des différentes composantes de la filière sont proposés. Ce cadre peut être retenu comme une démarche d'orientation et d'aide à l’identification et à la hiérarchisation des interventions de l’Etat et de ses PTF. Description of the subject. In sub-Saharan countries and particularly in Senegal, traditional seed systems still represent the most widespread option in family-based agricultures, despite the many efforts made by Governments to develop modern and economically sustainable seed chains. Objectives. Analyse formal rainfed rice seed sector in Casamance, a rice-rich regionwhere rice is still the main source of food for rural households, at the organizational and at the level of market structure. Method. Collected statistical data were processed to describe the situation of demand/supply of certified rice seed in the subregion and in targeted region. Through semi-structured interviews, the main actors of the sector were interviewed to identify and analyse chain structure and to fill the information gap from quantitative data. Results. The study identifies the main limitations and constraints of the sector as well as the inefficiencies of a seed system designed as a market chain and not adapted to a subsistence context where the final commercial demand for certified seeds is almost zero. A strong dependence of the actors involved in relation to interventions of Government and its technical and financial partners and the lack of a consultation and planning framework between actors and supply systems have been outlined. Conclusions. The implementation of an integrated seed system and a framework of actions to be undertaken in the region to support the integration of various chain are proposed. This framework can be used as tool to orient and assist the identification and prioritization of interventions of Government and its TFP. &nbsp

    Internal Migration and Wage Differentials among Italian University Graduates

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    In this paper, we estimate wage differentials among Italian university Graduates three years after graduation due to sequential geographic mobility. By means of a matching procedure we quantify wage premia associated with the choice of studying far from home, moving after graduation and moving back home after graduation. We find evidence of large gains for those who move after graduation, little benefits for those who choose to go back home after having studied in regions different from that of origin. We also assess a “transitivity” result for the estimated treatment effects
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