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74 papers · 1 filter
Relativistic NN scattering equations without partial-wave decomposition
G. Ramalho, A. Arriaga, M. T. Peña
Relativistic quasi-potential equations describing NN scattering are compared. Within the spectator formalism a cancellation is seen to occur between retardation and negative-energy…
Model-independent definition and determination of electromagnetic formfactors and multipole moments
F. Kleefeld
A theoretical method for the systematic definition and determination of Cartesian and spherical electromagnetic (onshell) formfactors and multipole moments for particles or composi…
Light-light and heavy-light mesons spectra from nonperturbative QCD
A. V. Nefediev
Properties of light-light mesons are described by the effective Hamiltonian with spinless quarks derived from QCD. The spectrum is computed by the WKB method and shown to reproduce…
Spinor Description of a General Spin-J System
V. R. Vieira, P. D. Sacramento
We consider a spin coherent states description of a general quantum spin system. It is shown that it is possible to use the spin-1/2 representation to study the general spin-J case…
Testing CPT invariance by using C-even neutral-meson--antimeson correlated states
G. V. Dass, W. Grimus, L. Lavoura
We consider the decays of a correlated neutral-meson--antimeson state with C-parity +1. We show that there is CPT noninvariance in the mixing of the neutral mesons if, for any two…
Neutrino Magnetic Moment Solution for the Solar Neutrino Problem and the SNO Experiment
Joao Pulido
The motivations for the magnetic moment solution to the solar neutrino problem are briefly reviewed and the expected values for a number of observables to be measured by the SNO ex…