17,849 research outputs found
Percolation for the stable marriage of Poisson and Lebesgue with random appetites
Let be a set of centers chosen according to a Poisson point process in
. Consider the allocation of to which is
stable in the sense of the Gale-Shapley marriage problem, with the additional
feature that every center has a random appetite , where
is a nonnegative scale constant and is a nonnegative random
variable. Generalizing previous results by Freire, Popov and Vachkovskaia
(\cite{FPV}), we show the absence of percolation when is small enough,
depending on certain characteristics of the moment of .Comment: 12 pages. Final versio
Testing models with non-minimal Higgs sector through the decay t->q+WZ
We study the contribution of charged Higgs boson to the rare decay of the top
quark t->q+WZ (q=d,s,b) in models with Higgs sector that includes doublets and
triplets. Higgs doublets are needed to couple charged Higgs with quarks,
whereas the Higgs triplets are required to generate the non-standard vertex HWZ
at tree-level. It is found that within a model that respect the custodial SU(2)
symmetry and avoids flavour changing neutral currents by imposing discrete
symmetries, the decay mode t->b+WZ, can reach a branching ratio of order
0.0178, whereas the decay modes t->(d,s)+WZ, can reach a similar branching
ratio in models where flavour changing neutral currents are suppressed by
flavour symmetries.Comment: Typeset using REVTEX and EPSF, 5 pag, 2 figure
Costly capital reallocation and energy use
In time series data, energy use does not change much with energy price changes. However, energy use is responsive to international differences in energy prices in cross-section data across countries. In this paper we consider a model of energy use in which production takes place at individual plants and capital can be used either to directly produce output or to reduce the energy required to run the planto We assume that reallocating capital from one use to another is costly. This turns out to be crucial for the quantitative properties of the model to be in conformity with the low short-mn and high long-run elasticities of energy use seen in data. Furthermore, our model displays variations in capacity utilization that are in line with those observed during the period of major oil price increases.Energy price, Energy use, Costly capital reallocation, Number of plants.
Axial Transition Form Factors and Pion Decay of Baryon Resonances
The pion decay constants of the lowest orbitally excited states of the
nucleon and the along with the corresponding axial transition
form factors are calculated with Poincar\'e covariant constituent-quark models
with instant, point and front forms of relativistic kinematics. The model wave
functions are chosen such that the calculated electromagnetic and axial form
factors of the nucleon represent the empirical values in all three forms of
kinematics, when calculated with single-constituent currents. The pion decay
widths calculated with the three forms of kinematics are smaller than the
empirical values. Front and instant form kinematics provide a similar
description, with a slight preference for front form, while the point form
values are significantly smaller in the case of the lowest positive parity
resonances.Comment: 18 pages, 5 figures. Slightly revised, accepted in Phys. Rev.
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