Pionium is a composite particle consisting of one and one meson. It can be created, for instance, by interaction of a proton beam accelerated by a particle accelerator and a target nucleus. Pionium has a short lifetime, predicted by chiral perturbation theory to be (i.e. 2.89 femtoseconds). It decays mainly into two mesons, and to a smaller extent into two photons.
Pionium is a composite particle consisting of one and one meson. It can be created, for instance, by interaction of a proton beam accelerated by a particle accelerator and a target nucleus. Pionium has a short lifetime, predicted by chiral perturbation theory to be (i.e. 2.89 femtoseconds). It decays mainly into two mesons, and to a smaller extent into two photons.
It has been investigated at CERN to measure its lifetime. The Dimeson Relativistic Atomic Complex (DIRAC) experiment at the Proton Synchrotron was able to detect 21,227 atomic pairs from a total of events, which allows the pionium lifetime to be determined to within statistical errors of 9%.
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