7,163 research outputs found
Inclusive and differential W and Z at CMS and ATLAS
Several electroweak precision measurements are performed by the ATLAS and CMS
collaborations at the LHC. The main ones are carried out using Drell-Yan
production of single W and Z boson. They regard the measurement of the
production cross sections of W and Z bosons, the mass of the W boson, and
. The results of the measurements have an
accuracy of approximately twice that reached at LEP and SLD. Other measurements
reported are about the Drell-Yan differential production cross section.Comment: Contribution to the 2019 QCD session of the 54th Rencontres de
Morion
Measurement of Direct CP Asymmetries in Charmless Hadronic B Decays
We present recent results on time integrated and time dependent CP violation
for charmless hadronic B decays using BABAR detector at the PEP-II B-factory.Comment: 7 pages, 3 postscript figues, contributed to the Proceedings of
ICHEP200
Fast and Robust Detection of Fallen People from a Mobile Robot
This paper deals with the problem of detecting fallen people lying on the
floor by means of a mobile robot equipped with a 3D depth sensor. In the
proposed algorithm, inspired by semantic segmentation techniques, the 3D scene
is over-segmented into small patches. Fallen people are then detected by means
of two SVM classifiers: the first one labels each patch, while the second one
captures the spatial relations between them. This novel approach showed to be
robust and fast. Indeed, thanks to the use of small patches, fallen people in
real cluttered scenes with objects side by side are correctly detected.
Moreover, the algorithm can be executed on a mobile robot fitted with a
standard laptop making it possible to exploit the 2D environmental map built by
the robot and the multiple points of view obtained during the robot navigation.
Additionally, this algorithm is robust to illumination changes since it does
not rely on RGB data but on depth data. All the methods have been thoroughly
validated on the IASLAB-RGBD Fallen Person Dataset, which is published online
as a further contribution. It consists of several static and dynamic sequences
with 15 different people and 2 different environments
Explicit Reference Governor for Continuous Time Nonlinear Systems Subject to Convex Constraints
This paper introduces a novel closed-form strategy that dynamically modifies
the reference of a pre-compensated nonlinear system to ensure the satisfaction
of a set of convex constraints. The main idea consists of translating
constraints in the state space into constraints on the Lyapunov function and
then modulating the reference velocity so as to limit the value of the Lyapunov
function. The theory is introduced for general nonlinear systems subject to
convex constraints. In the case of polyhedric constraints, an explicit solution
is provided for the large and highly relevant class of nonlinear systems whose
Lyapunov function is lower-bounded by a quadratic form. In view of improving
performances, further specializations are provided for the relevant cases of
linear systems and robotic manipulators.Comment: Submitted to: IEEE Transactions on Automatic Contro
Gravitational waves emitted by extrasolar planetary systems
In this paper we consider the Extra-solar Planetary Systems recently
discovered in our Galaxy as potential sources of gravitational waves. We
estimate the frequency and characteristic amplitude of the radiation they emit
due to the orbital motion, using the quadrupole formalism. In addition, we
check whether the conditions needed for the resonant excitation of the f- and
g-modes of the central star can be fulfilled. By a Roche-lobe analysis, we show
that there could exist systems in which the low-order g-modes could be excited,
although this does not happen in the systems discovered up to now.Comment: 14 pages, 5 figures. Accepted for publication on International
Journal of Modern Physics D. Table 6 and minor typos correcte
What we (don't) know about black hole formation in high-energy collisions
Higher-dimensional scenarios allow for the formation of mini-black holes from
TeV-scale particle collisions. The purpose of this paper is to review and
compare different methods for the estimate of the total gravitational energy
emitted in this process. To date, black hole formation has mainly been studied
using an apparent horizon search technique. This approach yields only an upper
bound on the gravitational energy emitted during black hole formation.
Alternative calculations based on instantaneous collisions of point particles
and black hole perturbation theory suggest that the emitted gravitational
energy may be smaller. New and more refined methods may be necessary to
accurately describe black hole formation in high-energy particle collisions.Comment: 6 pages, ReVTeX 4. Minor corrections and some relevant references
adde
Wage incentive profiles in dual labour markets
We propose a modified version of the Shapiro-Stiglitz’s (1984) efficiency wage model by introducing temporary contracts in the standard setup. New theoretical insights emerge on the incentive problem faced by workers and firms. We argue that the existence of temporary contracts broaden the incentive menu available to employers and that the optimal incentive structure can be sustained as an equi- librium outcome only if permanent contracts do not disappear. We also provide an alternative explanation of the wage penalty suffered by temporary workers even if standard models of efficiency wages would predict higher compensations for workers facing a higher job loss risk.Dual labour market, efficiency wages, wage differentials
Quantum Simulation of single-qubit thermometry using linear optics
Standard thermometry employs the thermalisation of a probe with the system of
interest. This approach can be extended by incorporating the possibility of
using the non-equilibrium states of the probe, and the presence of coherence.
Here, we illustrate how these concepts apply to the single-qubit thermometer
introduced by Jevtic et al. by performing a simulation of the qubit-environment
interaction in a linear-optical device. We discuss the role of the coherence,
and how this affects the usefulness of non-equilibrium conditions. The origin
of the observed behaviour is traced back to the propensity to thermalisation,
as captured by the Helmholtz free energy.Comment: 6 pages, 6 figure
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