Abstract
The Coulomb interaction which occurs in the final state between two particles with opposite charges allows for creation of the bound state of these particles. In the case when particles are generated with large momentum in lab frame, the Lorentz factors of the bound state will also be much larger than one. The relativistic velocity of the atoms provides the oppotrunity to observe bound states of (π+μ-), (π+π-) and (π+ K -) with a lifetime as short as 10-16 s, and to measure their parameters. The ultrarelativistic positronium atoms (A 2e ) allow us to observe the effect of superpenetration in matter, to study the effects caused by the formation time of A 2e from virtual e+e- pairs and to investigate the process of transformation of two virtual particles into the bound state.
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Nemenov, L. (2001). Elementary Relativistic Atoms. In: Karshenboim, S.G., Bassani, F., Pavone, F., Inguscio, M., Hänsch, T. (eds) The Hydrogen Atom. Lecture Notes in Physics, vol 570. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-45395-4_12
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