51 research outputs found

    One-loop QCD contributions to differential cross-sections for Higgs production at N3^3LO

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    We present one-loop contributions to the fully differential Higgs boson gluon-fusion cross-section for Higgs production via gluon fusion. Our results constitute a necessary ingredient of a complete N3^3LO determination of the cross-section. We perform our computation using a subtraction method for the treatment of soft and collinear singularities. We identify the infrared divergent parts in terms of universal splitting and eikonal functions, and demonstrate how phase-space integrations yield poles (up to 1/Ï”61/\epsilon^6 ) in the dimensional regulator Ï”=(4−d)/2\epsilon=(4-d)/2. We compute the coefficients of the Ï”\epsilon expansion, including the finite part numerically. As a demonstration of our numerical implementation, we present the corrections at N3^3LO due to one-loop amplitudes in the rapidity and transverse momentum of the Higgs boson.Comment: 25 pages, 2 figure

    Higgs-differential cross section at NNLO in dimensional regularisation

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    We present an analytic computation of the Higgs production cross section in the gluon fusion channel, which is differential in the components of the Higgs momentum and inclusive in the associated partonic radiation through NNLO in perturbative QCD. Our computation includes the necessary higher order terms in the dimensional regulator beyond the finite part that are required for renormalisation and collinear factorisation at N3^3LO. We outline in detail the computational methods which we employ. We present numerical predictions for realistic final state observables, specifically distributions for the decay products of the Higgs boson in the γγ\gamma\gamma decay channel.Comment: 27 pages, 6 awesome figure

    Assessment of DNA damages in lymphocytes of agricultural workers exposed to pesticides by comet assay in a cross-sectional study

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    Purpose: To assess the predictive power of the comet assay in the context of occupational exposure to pesticides. Materials and methods: The recruited subjects completed a structured questionnaire and gave a blood sample. Exposure to pesticides was measured by means of an algorithm based on Dosemeci’s work (Agricultural Health Study). Approximately 50 images were analyzed for each sample via fluores- cence microscopy. The extent of DNA damage was estimated by tail moment (TM) and is the product of tail DNA (%) and tail Length. Results: Crude significant risks (odds ratios, ORs) for values higher than the 75th percentile of TM were observed among the exposed subjects (score>1). The frequency of some confounding factors (sex, age and smoking) was significantly higher among the exposed workers. A significant dose–effect relationship was observed between TM and exposure score. Significant high-risk estimates (ORs), adjusted by the studied confounding factors, among exposure to pesticides and TM, % tail DNA and tail length were confirmed using unconditional logistic regression models. Conclusions: The adjusted associations (ORs) between the comet parameters and exposure to pesti- cides were significant. The sensitivity of the comet test was low (41%), the specificity (89%) and the predictive positive value (0.77) were found acceptable

    SystÚmes de contrÎle de constitutionnalité par voie incidente et protection des personnes en situation de vulnérabilité

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    RĂ©pondant Ă  l’appel Ă  projets « QPC 2020 » du Conseil constitutionnel, le travail de recherche collectif – dont les rĂ©sultats sont publiĂ©s dans cet ouvrage – entend Ă©valuer l’efficacitĂ© de la question prioritaire de constitutionnalitĂ© sous l’angle particulier de la protection des personnes en situation de vulnĂ©rabilitĂ© et selon une approche de droit comparĂ©. La recherche a ainsi eu pour ambition de dresser un bilan de la jurisprudence QPC du Conseil constitutionnel pour ce qui concerne la protection des personnes vulnĂ©rables, en la confrontant avec les procĂ©dures similaires existant dans deux pays voisins : l’Italie et l’Espagne. La protection effective des personnes qui en ont le plus besoin a semblĂ© en effet ĂȘtre un point de vue particuliĂšrement pertinent pour Ă©valuer, de maniĂšre gĂ©nĂ©rale, l’efficacitĂ© du systĂšme de la QPC et pour vĂ©rifier s’il constitue un vĂ©ritable progrĂšs dans la dĂ©fense des droits fondamentaux. Pour rendre compte de la maniĂšre la plus fidĂšle possible des rĂ©sultats de cette recherche, l’ouvrage prĂ©sente, dans une premiĂšre partie, le rapport de synthĂšse adressĂ© au Conseil constitutionnel par les porteurs du projet, dans lequel est rĂ©alisĂ©e la comparaison proprement dite ; puis, dans une seconde partie, les Ă©tudes nationales concernant la jurisprudence constitutionnelle des trois pays Ă©tudiĂ©s, Ă©laborĂ©es par les chercheurs participants au projet scientifique

    Vector Fields in a Rindler Space

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    In questo lavoro ci si propone di studiare la quantizzazione del campo vettoriale, massivo e non massivo, in uno spazio-tempo di Rindler, considerando in particolare i gauge di Feynman e assiale. Le equazioni del moto vengono risolte esplicitamente in entrambi i casi; sotto opportune condizioni, Ăš stato inoltre possibile trovare una base completa e ortonormale di soluzioni delle equazioni di campo in termini di modi normali di Fulling. Si Ăš poi analizzata la quantizzazione dei campi vettoriali espressi in questa base
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