18,038 research outputs found
Combining NLO QCD and Electroweak Radiative Corrections to W boson Production at Hadron Colliders in the POWHEG Framework
The precision measurement of the mass of the boson is an important goal
of the Fermilab Tevatron and the CERN Large Hadron Collider (LHC). It requires
accurate theoretical calculations which incorporate both higher-order QCD and
electroweak corrections, and also provide an interface to parton-shower Monte
Carlo programs which make it possible to realistically simulate experimental
data. In this paper, we present a combination of the full
electroweak corrections of {\tt WGRAD2}, and the next-to-leading order QCD
radiative corrections to production in hadronic collisions in a
single event generator based on the {\tt POWHEG} framework, which is able to
interface with the parton-shower Monte Carlo programs {\tt Pythia} and {\tt
Herwig}. Using this new combined QCD+EW Monte Carlo program for production
we provide numerical results for total cross sections and kinematic
distributions of relevance to the mass measurement at the Tevatron and the
LHC for the processes . In
particular, we discuss the impact of EW corrections in the presence of QCD
effects when including detector resolution effects.Comment: 32 pages, 28 postscript figures, typos fixed, plot on the right-hand
side of Fig.12 replaced with results from a higher statistics run, note adde
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Enterprise application reuse: Semantic discovery of business grid services
Web services have emerged as a prominent paradigm for the development of distributed software systems as they provide the potential for software to be modularized in a way that functionality can be described, discovered and deployed in a platform independent manner over a network (e.g., intranets, extranets and the Internet). This paper examines an extension of this paradigm to encompass ‘Grid Services’, which enables software capabilities to be recast with an operational focus and support a heterogeneous mix of business software and data, termed a Business Grid - "the grid of semantic services". The current industrial representation of services is predominantly syntactic however, lacking the fundamental semantic underpinnings required to fulfill the goals of any semantically-oriented Grid. Consequently, the use of semantic technology in support of business software heterogeneity is investigated as a likely tool to support a diverse and distributed software inventory and user. Service discovery architecture is therefore developed that is (a) distributed in form, (2) supports distributed service knowledge and (3) automatically extends service knowledge (as greater descriptive precision is inferred from the operating application system). This discovery engine is used to execute several real-word scenarios in order to develop and test a framework for engineering such grid service knowledge. The examples presented comprise software components taken from a group of Investment Banking systems. Resulting from the research is a framework for engineering servic
Optimal phosphorus loading for a potentially eutrophic lake
dynamic programming;sustainable development;ecology
Phonon-mediated vs. Coulombic Back-Action in Quantum Dot circuits
Quantum point contacts (QPCs) are commonly employed to capacitively detect
the charge state of coupled quantum dots (QD). An indirect back-action of a
biased QPC onto a double QD laterally defined in a GaAs/AlGaAs heterostructure
is observed. Energy is emitted by non-equilibrium charge carriers in the leads
of the biased QPC. Part of this energy is absorbed by the double QD where it
causes charge fluctuations that can be observed under certain conditions in its
stability diagram. By investigating the spectrum of the absorbed energy, we
identify both acoustic phonons and Coulomb interaction being involved in the
back-action, depending on the geometry and coupling constants
Large antenna apertures and arrays for deep space communications
Effect of frequency on communications capability, single antennas and arrays, and economic balance between ground station and spacecraft developmen
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