6,199 research outputs found
Inclusion of W^+- single-spin asymmetry data in a polarised PDF determination via Bayesian reweighting
We discuss how the experimental information from longitudinal single-spin
asymmetries for boson production in polarised proton-proton
collisions can be included in a polarised parton determination by Bayesian
reweighting of a Monte Carlo set of polarised PDF replicas. We explicitly
construct a prior ensemble of polarised parton distributions using available
fits to inclusive and semi-inclusive DIS data and we discuss the potential
impact of existing and future RHIC measurements on it.Comment: 5 pages, 4 figures, to appear in the proceedings of the 3rd Workshop
on the QCD Structure of the Nucleon (QCD-N'12), Bilbao October 201
Fragmentation functions of charged hadrons
I present a preliminary determination of the Fragmentation Functions (FFs) of
unidentified charged hadrons at next-to-leading order in quantum
chromodynamics. The analysis is based on hadron production cross section data
in single-inclusive electron-positron annihilation. It extends a recent
determination of the FFs of identified charged pions, charged kaons and
protons/antiprotons performed by the NNPDF Collaboration. I illustrate the
quality of the FFs determined in this analysis and show how they describe the
charged hadron spectra measured in proton-(anti)proton collisions.Comment: 5 pages, 3 figures, 1 table, contribution to the proceedings of the
XXV Workshop on Deep-Inelastic Scattering and related Subjects (DIS2017
The timelike half-supersymmetric backgrounds of N=2, D=4 supergravity with Fayet-Iliopoulos gauging
Subject to some relatively mild assumptions, we derive the complete form of
all timelike half-supersymmetric solutions to N=2, D=4 gauged supergravity
coupled to an arbitrary number of abelian vector multiplets. This is done using
spinorial geometry techniques. Explicit examples are given for a simple
prepotential. Among the solutions, there are near-horizon geometries of
extremal rotating BPS black holes still to be discovered, with a nontrivial
dependence of the scalar fields on one of the horizon coordinates.Comment: 38 pages, uses JHEP3.cl
A Mathematica interface to NNPDFs
We present a Mathematica interface for handling the parton distribution
functions of the NNDPF Collaboration, available from the NNPDF hepforge website
http://nnpdf.hepforge.org/. As a case study we briefly summarise the first PDF
set which includes all relevant LHC data, NNPDF2.3, and demonstrate the use of
our new Mathematica interface.Comment: 4 pages, 5 figures, to appear in the proceedings of the 16th
International Conference in Quantum Chromodynamics (QCD2012), Montpellier
July 201
The development of a tool to promote sustainability in casting processes
The drive of the manufacturing industry towards productivity, quality and profitability has been supported in the last century by the availability of relatively cheap and abundant energy sources with limited focus on the minimisation of energy and material waste. However, in the last decades, more and more stringent regulations aimed at reducing pollution and consumption of resources have been introduced worldwide and in particular in Europe. Consequently, a highly mature and competitive industry like foundry is expecting challenges that an endeavour towards sustainability can turn into significant opportunities for the future. A tool to undertake a systematic analysis of energy and material flows in the casting process is being developed. An overview of the computer program architecture is presented and its output has been validated against real-world data collected from foundries
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