174,298 research outputs found
Equivalences of Smooth and Continuous Principal Bundles with Infinite-Dimensional Structure Group
Let K be a a Lie group, modeled on a locally convex space, and M a
finite-dimensional paracompact manifold with corners. We show that each
continuous principal K-bundle over M is continuously equivalent to a smooth one
and that two smooth principal K-bundles over M which are continuously
equivalent are also smoothly equivalent. In the concluding section, we relate
our results to neighboring topics.Comment: 18 pages, final versio
Measuring spin and CP from semi-hadronic ZZ decays using jet substructure
We apply novel jet techniques to investigate the spin and CP quantum numbers
of a heavy resonance X, singly produced in pp -> X -> ZZ -> l(+)l(-)jj at the
LHC. We take into account all dominant background processes to show that this
channel, which has been considered unobservable until now, can qualify under
realistic conditions to supplement measurements of the purely leptonic decay
channels X -> ZZ -> 4l. We perform a detailed investigation of spin- and
CP-sensitive angular observables on the fully-simulated final state for various
spin and CP quantum numbers of the state X, tracing how potential sensitivity
communicates through all the steps of a subjet analysis. This allows us to
elaborate on the prospects and limitations of performing such measurements with
the semihadronic final state. We find our analysis particularly sensitive to a
CP-even or CP-odd scalar resonance, while, for tensorial and vectorial
resonances, discriminative features are diminished in the boosted kinematical
regime.Comment: 12 pages, 7 figures, 2 tables, published versio
Local transport measurements on epitaxial graphene
Growth of large-scale graphene is still accompanied by imperfections. By
means of a four-tip STM/SEM the local structure of graphene grown on SiC(0001)
was correlated with scanning electron microscope images and spatially resolved
transport measurements. The systematic variation of probe spacings and
substrate temperature has clearly revealed two-dimensional transport regimes of
Anderson localization as well as of diffusive transport. The detailed analysis
of the temperature dependent data demonstrates that the local on-top nano-sized
contacts do not induce significant strain to the epitaxial graphene films.Comment: 3 figure
Strangeness Production and Hadron Spectroscopy at HERA
An overview of the recent results on strangeness production and spectroscopy
from the electron-proton collider experiments H1 and ZEUS at HERA is presented.
Production of particles with light and strange quarks is discussed and compared
with both theoretical predictions and with data from e+e- experiments.
Measurements in the charm sector cover studies of the radially and orbitally
excited charm states. Finally, the investigation of exotic states in the
strangeness sector at HERA is reviewed.Comment: ICHEP0
Keynote address: Foreign Bodies / Jewellery as Prosthesis
This article, published in Design Research Quarterly (3:4) October 2008, is based on the keynote address given by Prof Christoph Zellweger at the DRS conference in 2008.
Design Research Quarterly. Design Research Society ISSN 1752-8445</p
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