Global minimization in few-body systems

Global minimization in few-body systems

Optimization techniques have been extensively used in a variety of physical problems in Many-Body systems such as the construction of optical potentials, phase shift analyses, variational calculations, neural network training, etc. In the field of Few-Body systems however, their use is rather limited although there are cases where the method could be very useful. A subtle feature is that when t...

Universality in Few-Body Systems

Low-energy universality in atomic few-body systems as a result of a large two-body scattering length has gained a lot of attention recently. Here, I discuss recent progress in describing the three-body recombination of cold atoms in terms of a finite set of universal scaling functions and review results for the recombination length of 133Cs atoms obtained with these functions. Furthermore, I wi...

Few-body Systems the Few-body Coulombian Problem

Recent advances in the treatment of scattering of charged composite particles are reviewed. In a rst part I report on developments of the theory. Speciically I describe the recent completion of the derivation of the coordinate space asymptotic behaviour of the wave function for three charged particles in the continuum. This knowledge is increasingly being made use of in attempts tòderive' three...

Quantum Universality in Few-Body Systems

Generalized parton distributions of few body systems

The relevance of measuring Generalized Parton Distributions (GPDs) for few nucleon systems is illustrated. An approach which permits to calculate the GPDs of hadrons made of composite constituents by proper convolutions is described. The application of the method to the nucleon target, assumed to be made of composite constituents is reviewed. Calculations of GPDs for few nucleon systems are sum...