3,315 research outputs found
Towards High Precision with ATLAS
No full textI review the roadmap towards a precise measurement of M
Erratum to: DYTurbo: fast predictions for Drell–Yan processes (The European Physical Journal C, (2020), 80, 3, (251), 10.1140/epjc/s10052-020-7757-5)
No full textThe Ref. [1] was missing in the published version of the paper
DYTurbo: fast predictions for Drell–Yan processes
No full textDrell–Yan lepton pair production processes are extremely important for standard model (SM) precision tests and for beyond the SM searches at hadron colliders. Fast and accurate predictions are essential to enable the best use of the precision measurements of these processes; they are used for parton density fits, for the extraction of fundamental parameters of the SM, and for the estimation of background processes in searches. This paper describes a new numerical program, DYTurbo, for the calculation of the QCD transverse-momentum resummation of Drell–Yan cross sections up to next-to-next-to-leading logarithmic accuracy combined with the fixed-order results at next-to-next-to-leading order (O(αS2)), including the full kinematical dependence of the decaying lepton pair with the corresponding spin correlations and the finite-width effects. The DYTurbo program is an improved reimplementation of the DYqT, DYRes and DYNNLO programs, which provides fast and numerically precise predictions through the factorisation of the cross section into production and decay variables, and the usage of quadrature rules based on interpolating functions for the integration over kinematic variables
Modular engineering of synthetic glycolytic pathways in Saccharomyces cerevisiae
No full textAlready for millennia, microbial fermentation is used for the production of dairy products, alcoholic beverages and bread. In the last decades, the field of biotechnology has tremendously expanded and nowadays, a wide range of compounds ranging from biofuels to chemicals and pharmaceuticals is produced using microbial cell factories. The development of genetic engineering tools has greatly contributed to this rapid development. Catalysing the conversion of renewable carbohydrate feedstocks into fuels and chemicals, microbial cell factories offer a sustainable alternative to fossil resources-based production, and thereby contribute to reduce greenhouse gas emissions. The yeast Saccharomyces cerevisiae plays an important role in industrial biotechnology. Its popularity for applied research and industrial production can be attributed to several factors as its fast fermentative metabolism, its tolerance to low pH, high sugar and alcohol concentrations and its genetic tractability. S. cerevisiae possesses one of the best furbished molecular toolboxes, which makes it possible to assemble complex heterologous pathways, as was recently illustrated by the successful biosynthesis of opioids in yeast. Despite this great progress, extensive genetic remodelling of native pathways remains challenging. This can largely be explained by the high genetic redundancy present in the yeast genome, in which multiple genes encode proteins with redundant functions, and by the fact that the genes belonging to a pathway are scattered over the entire genome. The goal of this thesis was to design, set up and validate a strategy aiming at facilitating the remodelling of (essential) pathways, based on simplifying and reorganizing the yeast genome. The starting point of this research is the central carbon metabolism and in particular, as proof of concept, the glycolytic pathway.BT/Industriele Microbiologi
An Academic Library in Maastricht: Festivity of Transformative architecture
No full textFestive moments and the built environment have, throughout history, had great influence on each other. Festive architecture has always been concerned with building narratives. It has the ability to communicate political, emotional, social or cultural messages and even change peoples perceptions. In the contemporary built environment of our everyday lives however, this powerful tool is often forgotten, resulting in rather 'flat' architecture that allows us to remain detached.This project aimed to challenge this flatness of everyday working life by questioning the separation between festive and everyday moments. Extensive studies into the vocabulary of festive architecture created a toolset that was used in the casestudy of an academic library. The project carefully stages an assemblage of spatial experiences. Each experience strives to support the actions within the space by influencing how people perceive the atmosphere, the context, each other, their own aim and the role of the building in society. Architecture, Urbanism and Building Sciences | Interiors Buildings Citie
Recherche de bosons de Higgs neutres h et A dans les états finals à quatre jets, avec le détecteur DELPHI à LEP200
No full textSearches for Higgs bosons are presented in the framework of the standard model, of the minimal supersymmetric model, and of its first extension. The data sample used has been collected by Delphi in 1997 and 1998, and represents an integrated luminosity of 212 . The final states considered are the decay of the process, and the decay of the process. The methods used for the analyses and for the interpretation of their results are described, as well as the implementation of b-quark identification from leptonic decays. After a first selection, the discrimination between background and signal events is studied, and the most powerful quantities are combined into a single variable. The best signal sensitivity is obtained by a weighted counting of all events, where the weight of the events is defined on the basis of the single variable. An excess of data, encountered in the search for hZ, justifies a separate discussion. The main instrumental and theoretical uncertainties, from which this excess could originate, are discussed. It is shown that the majority of the events in excess do not correspond to a Higgs signal, and that it is difficult to understand the excess as a consequence of imperfect standard process simulation. The results of the searches allow to give limits on the masses of the Higgs bosons in the models under consideration. The data imply >93 GeV in the standard model. In the MSSM, one finds >82.4 GeV and >83.3 GeV, for any tan . On the simplest extension of the MSSM, the pseudoscalar mass parameter must be greater than 69 GeV for tan >1. No constraint is found for tan <1. All limits are given at 95% C.L
Flavour and model-independent Higgs boson searches at LEP
No full textNow the LEP experiments have finalized their results on the Standard-Model Higgs boson, and are finalizing results on the most common Supersymmetric scenari, a wealth of results are being released that do not rely on explicit model assumptions, but rather on particular final states. In the absence of any convincing excess in the data, results are then extracted in a quasi model-independent way, most often in the form of excluded signal cross-sections, normalized to Standard Model cross-sections. The aim of the experiments is to provide a catalog of results that can be used in a straightforward way for future studies of models of electroweak symmetry breaking.
PACS: 13.66.Fg Gauge and Higgs boson production in e
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e
– intteractions – 13.66.Hk Production of non-standard model particles in e
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– interaction
Are plant diseases too much ignored in the climate change debate?
No full textIgnoring plant diseases misinforms the climate change and food security debate. Diseases are expected not only to cause more severe crop loss in many areas in the world and threaten food security, but also to decrease the climate change mitigation capacity of forests, of other natural ecosystems and of producing crops. However, if research, policy and industry join forces to obtain the multidisciplinary knowledge necessary to adapt integrated pest management (IPM) to the changing climate, it is expected that sufficiently resilient cropping systems can be developed in time. This was the main conclusion of the International Conference on Climate Change and Plant Disease Management held in Evora, Portugal, in November 201
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