Example of positron transport simulation in the SOPHI system. Electrons have been sorted, and positrons (shown as coloured spiral lines) will be guided by the magnetic field.
In the Big Bang theory, matter and antimatter appeared in equal proportions at the very beginning of the Universe. Particles and antiparticles mutually annihilated each other, but one billionth of the baryons subsisted to form the matter of the world around us. The origin of this extraordinarily slight excess matter remains one of the major enigmas of particle physics and cosmology. One of the possible explanations is based on the 'CP violation' phenomenon, which is actively investigated through experiments focusing on the properties of K or B mesons.
In addition, the he behaviour of antimatter in a gravitational field is another major enigma of modern physics. The Anti-Hydrogen experiment currently under preparation at DAPNIA addresses this issue.
last update : 10-18 00:00:00-2005 (602)
Lorentz symmetry probed in the BaBar experiment
The BaBar experiment running on the PEP-II accelerator at SLAC (California) has been collecting data for ten years and has recorded sufficient events to probe the most subtle aspects of the Standard Model of particle physics and quantum field ... More »
The D0 experiment at the Tevatron accelerator at Fermilab (Chicago), in which physicists from CEA/IRFU and CNRS/IN2P3 are involved, has measured a significant matter-antimatter _asymmetry_ in the behaviour of particles containing b ... More »