175,417 research outputs found
Top quark longitudinal polarization near the threshold in l+ l- annihilation
We show that the longitudinal polarization of the top quarks produced in the
annihilation of e+ e- or mu+ mu- into tbar t at energies near the threshold is
not affected by the large Coulomb-type corrections, which greatly modify the
total cross section. Thus the longitudinal polarization, although small, may
provide an independent information on the mass and the width of the top quark,
largely independent of the uncertainty in alpha_s.Comment: 6 pages, LaTeX, no figures, added references, corrected typo
On mixing angles and magnetic moment of heavy tau neutrino
If the magnetic moment of unstable tau neutrinos with the mass of (MeV) is
in the region of , it is compatible with the present experimental and
cosmological bounds.
It is pointed out here, that if the tau neutrino has such a large magnetic
moment and can oscillate into a neutrino of another flavour the results from
scattering experiment at LAMPF constrain the tau neutrino mixing angles
to and
depending on the magnetic
moment value in the allowed region.Comment: 5 pages, LaTe
Knowledge-based vision and simple visual machines
The vast majority of work in machine vision emphasizes the representation of perceived objects and events: it is these internal representations that incorporate the 'knowledge' in knowledge-based vision or form the 'models' in model-based vision. In this paper, we discuss simple machine vision systems developed by artificial evolution rather than traditional engineering design techniques, and note that the task of identifying internal representations within such systems is made difficult by the lack of an operational definition of representation at the causal mechanistic level. Consequently, we question the nature and indeed the existence of representations posited to be used within natural vision systems (i.e. animals). We conclude that representations argued for on a priori grounds by external observers of a particular vision system may well be illusory, and are at best place-holders for yet-to-be-identified causal mechanistic interactions. That is, applying the knowledge-based vision approach in the understanding of evolved systems (machines or animals) may well lead to theories and models that are internally consistent, computationally plausible, and entirely wrong
Extraction of the beam elastic shape from uncertain FBG strain measurement points
Aim of the present paper is the analysis of the strain along the beam that is equipped with Glass Fibers Reinforced Polymers (GFRP) with an embedded set of optical Fiber Bragg Grating sensors (FBG), in the context of a project to equip with these new structural elements an Italian train bridge. Different problems are attacked, and namely: (i)during the production process [1] it is difficult to locate precisely the FBG along the reinforcement bar, therefore the following question appears: How can we associate the strain measurements to the points along the bar? Is it possible to create a signal analysis procedure such that this correspondence is found?(ii)the beam can be inflected and besides the strain at some points, we would like to recover the elastic shape of the deformed beam that is equipped with the reinforcement bars. Which signal processing do we use to determine the shape of the deformed beam in its inflection plane?(iii)if the beam is spatially inflected, in two orthogonal planes, is it possible to recover the beam spatial elastic shape? Object of the paper is to answer to these questions
Transport phenomenology for a holon-spinon fluid
We propose that the normal-state transport in the cuprate superconductors can
be understood in terms of a two-fluid model of spinons and holons. In our
scenario, the resistivity is determined by the properties of the holons while
magnetotransport involves the recombination of holons and spinons to form
physical electrons. Our model implies that the Hall transport time is a measure
of the electron lifetime, which is shorter than the longitudinal transport
time. This agrees with our analysis of the normal-state data. We predict a
strong increase in linewidth with increasing temperature in photoemission. Our
model also suggests that the AC Hall effect is controlled by the transport
time.Comment: 4 pages, 1 postscript figure. Uses RevTeX, epsf, multico
Quantum phases in a doped Mott insulator on the Shastry-Sutherland lattice
We propose the projected BCS wave function as the ground state for the doped
Mott insulator SrCu2(BO3)2 on the Shastry-Sutherland lattice. At half filling
this wave function yields the exact ground state. Adding mobile charge
carriers, we find a strong asymmetry between electron and hole doping. Upon
electron doping an unusual metal with strong valence bond correlations forms.
Hole doped systems are d-wave RVB superconductors in which superconductivity is
strongly enhanced by the emergence of inhomogeneous plaquette bond order.Comment: 4 pages, 3 figure
The false vacuum bubble nucleation due to a nonminimally coupled scalar field
We study the possibility of forming the false vacuum bubble nucleated within
the true vacuum background via the true-to-false vacuum phase transition in
curved spacetime. We consider a semiclassical Euclidean bubble in the Einstein
theory of gravity with a nonminimally coupled scalar field. In this paper we
present the numerical computations as well as the approximate analytical
computations. We mention the evolution of the false vacuum bubble after
nucleation.Comment: 23 pages, 12 figures, References added, minor correctio
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