11,312 research outputs found
We must know. We will know
The after-dinner talk has by now become a tradition of this Conference series
on Quark Confinement and the Hadron Spectrum. On this occasion, I have tried to
combine a free-style and (hopefully) amusing presentation with deep questions
of physics especially connected with the dynamics of strong interaction. To
this end some masterpieces of classical music (by Beethoven, Mozart, Dvorak,
Stravinsky ...) and pop music (by Bob Dylan, Eric Clapton) were employed to
illustrate certain aspects of physics. By no means was this presentation (nor
this paper) intended as a comprehensive review of the different topics examined
during the Conference, but rather a call for further thinking on the sinergy of
different branches of physics and the excitement of foreseen discoveries in a
not too distant future.Comment: 6 pages, 8 figures, After-dinner talk given at the IX Conference on
Quark Confinement and the Hadron Structure, Madrid, August 30th to September
3rd 201
Bottomonium Production at the Tevatron and the LHC
Inclusive bottomonium hadroproduction at the Tevatron is firstly examined in
a Monte Carlo framework with the colour-octet mechanism implemented in the
event generation. We extract some NRQCD colour-octet matrix elements relevant
for hadroproduction. Remarkably we find a quite small
contribution (compatible with zero) from feeddown of states
produced through the colour-octet mechanism: indirect production
via decays should be mainly ascribed to the colour-singlet model.
Finally we extrapolate to LHC energies to predict prompt
production rates.Comment: LaTeX, 11 pages, 6 EPS figure
Bottomonia Hadroproduction
We analyze Tevatron data of bottomonium hadroproduction in the framework of
the colour-octet model (COM) implemented in the event generator PYTHIA using
CTEQ4L PDF taking into account initial-state radiation of gluons and
Altarelli-Parisi evolution of final-state gluons. We obtain new values for the
colour-octet matrix elements relevant to this production process for the
Upsilon(nS) family (n=1,2,3), finding that the ^1S_0^{(8)}+^3P_J^{(8)}
contributions are not needed in the fit. We show the different contributions to
Upsilon(1S) production at Tevatron for p_T>8 GeV, comparing them with CDF data.
Finally we extrapolate to LHC energies to predict Upsilon(nS) production rates.Comment: Talk given at 4th International Conference on Hyperons, Charm and
Beauty Hadrons, Valencia, Spain, 27-30 Jun 2000. LaTeX, 4 pages, 4 EPS
figure
The Ellis semigroup of a nonautonomous discrete dynamical system
We introduce the {\it Ellis semigroup} of a nonautonomous discrete dynamical
system when is a metric compact space. The underlying
set of this semigroup is the pointwise closure of \{f\sp{n}_1 \, |\, n\in
\mathbb{N}\} in the space X\sp{X}.
By using the convergence of a sequence of points with respect to an
ultrafilter it is possible to give a precise description of the semigroup and
its operation. This notion extends the classical Ellis semigroup of a discrete
dynamical system. We show several properties that connect this semigroup and
the topological properties of the nonautonomous discrete dynamical system
Traffic Sign Recognition System
The research group CAOS at the Computing Department of the Carlos III University of Madrid, Spain, offers an efficient recognition system for traffic signs using a set of classifiers. This system can be used as part of an active security system in cars. The fact that the system is based on a set of classifiers facilitates a distributed implementation, resulting in cheaper hardware and an improvement in fault-tolerance.Contrato Programa de Comercialización e Internacionalización. Sistema Regional de Investigación Científica e Innovación Tecnológica. (Comunidad de Madrid; Universidad Carlos III de Madrid
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