15,480 research outputs found
Hybrid meson properties in Lattice QCD and Flux Tube Models
Flux tube model predictions for hybrid meson decays are beginning to be
confronted by Lattice QCD. We compare the two approaches for the -wave decay
of the exotic , and find excellent agreement. Results suggest that in
Strong QCD, \qq~ creation occurs with S=1.Comment: 6 pages, 1 figure, v2: discussion of parameters and lattice
uncertainties adde
Propulsion sizing program
Computer program was written to evaluate and define optimum design parameters of low pressure auxiliary propulsion system. APS will provide attitude and translational control of space shuttle vehicles. Program evaluates subsystem design parameters such as engine chamber pressure, mixture ratio, expansion ratio, and subsystem component weight and size
Dynamics of hadron strong production and decay
We generalize results of lattice QCD to determine the spin-dependent
symmetries and factorization properties of meson production in OZI allowed
processes. This explains some conjectures previously made in the literature
about axial meson decays and gives predictions for exclusive decays of vector
charmonia, including ways of establishing the structure of Y(4260) and Y(4325)
from their S-wave decays. Factorization gives a selection rule which forbids
near threshold with the tensor meson in helicity 2. The
relations among amplitudes for double charmonia production \e^+e^-\to
\psi\chi_{0,1,2} are expected to differ from the analagous relations among
light flavour production such as \e^+e^-\to \omega f_{0,1,2}.Comment: 13 pages; journal versio
Kinematical cusp and resonance interpretations of the X(2900)
We examine whether the LHCb vector state can be
interpreted as a kinematical cusp effect arising from and interactions. The production amplitude is modelled as a triangle
diagram with hadronic final state interactions. A satisfactory fit to the
Dalitz plot projection is obtained that leverages the singularities of the
production diagram without the need for resonances. A somewhat
better fit is obtained if the final state interactions are strong enough to
generate resonances, although the evidence in favour of this scenario is not
conclusive.Comment: 10 pages, 3 figures. Version to appear in Physics Letters
Distributive justice: from Steinhaus, Knaster, and Banach to Elster and Rawls: the perspective of sociological game theory
This article presents a relatively straightforward theoretical framework about distributive justice with applications. It draws on a few key concepts of Sociological Game Theory (SGT). SGT is presented briefly in section 2. Section 3 provides a spectrum of distributive cases concerning principles of equality, differentiation among recipients according to performance or contribution, status or authority, or need. Two general types of social organization of distributive judgment are distinguished and judgment procedures or algorithms are modeled in each type of social organization. Section 4 discusses briefly the larger moral landscapes of human judgment – how distribution may typically be combined with other value into consideration. The article suggests that Rawls, Elster, and Machado point in this direction. Finally, it is suggested that the SGT framework presented provides a useful point of departure to systematically link it and compare the Warsaw School of Fair Division, Rawls, and Elster, among others
- …