Bart Desplanques

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A minimum-norm least-squares image-reconstruction method for the reconstruction of magnetic resonance images from non-Cartesian sampled data is proposed. The method is based on a general formalism for continuous-to-discrete mapping and pseudoinverse calculation. It does not involve any regridding or interpolation of the data and therefore the methodology(More)
Two-pion exchange parity-violating nucleon-nucleon interactions from recent effective field theories and earlier fully covariant approaches are investigated. The potentials are compared with the idea to obtain better insight on the role of low-energy constants appearing in the effective field theory approach and the convergence of this one in terms of a(More)
Looking at a Hamiltonian formulation of relativistic dynamics, Dirac was led to consider various forms, depending on the symmetry properties of the hypersurface that is chosen in this order [ 1]. Accordingly, the generators of the Poincaré algebra drop into dynamical or kinematic ones. Among the different forms, the point-form approach, which is based on a(More)
The comparison of form factors calculated from a single-particle current in different relativistic quantum mechanic approaches evidences tremendous discrepancies. The role of constraints coming from space-time translations is considered here with this respect. It is known that invariance under these translations implies the energy-momentum conservation(More)
We study the effects of the |qqq qq̄〉 component of the hadronic wave function on the description of the electromagnetic structure of the nucleon. Starting with a 3q baryonic wave function which describes the baryonic and mesonic low energy spectrum, the extra qq̄ pair is generated through a relativistic version of the P0 model. It is shown that this model(More)
The P0 decay model is briefly reviewed. Possible improvements, partly motivated by the examination of a microscopic description of a quark–anti-quark pair creation, are considered. They can provide support for the one-body character of the model which, otherwise, is difficult to justify. To some extent, they point to a boost effect that most descriptions of(More)
Calculations of form factors in different forms of relativistic kinematics are presented. They involve the instant, front and point forms. In the two first cases, different kinematical conditions are considered while in the latter case, both a Dirac-inspired approach and a hyperplane-based one are incorporated in our study. Numerical results are presented(More)
The origin of parity violation in physics is still unknown. At the present time, it is introduced in the theory by requiring that the SU(2) subgroup entering the description of interactions involves the left components. In the present contribution, one elaborates upon a suggestion made by Landau that particles and antiparticles could be like(More)
Parity violation in nuclear systems is reviewed. A few ingredients relevant to the description of the parity-violating nucleon-nucleon force in terms of meson exchanges are reminded. Effects in nuclear systems are then considered. They involve pp scattering, some complex nuclei and the deuteron system. PACS. 24.80.+y Nuclear tests of fundamental(More)