Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1998-04-09
Phys.Rev. A58 (1998) 4556-4564
Physics
High Energy Physics
High Energy Physics - Phenomenology
19 pages, 9 figures, RevTex; v2: minor corrections for the accuracy of the results, a discussion of the literature added in a
Scientific paper
10.1103/PhysRevA.58.4556
We consider the production of ultrarelativistic positronium (Ps) in $\gamma A \to Ps + A$ and $e A \to Ps + e A$ processes where $A$ is an atom or a nucleus with charge $Ze$. For the photoproduction of para- and ortho-Ps and the electroproduction of para-Ps we obtain the most complete description compared with previous works. It includes high order $Z \alpha$ corrections and polarization effects. The accuracy of the obtained cross sections is determined by omitted terms of the order of the inverse Ps Lorentz factor squared. The studied high order multi-photon electroproduction of ortho-Ps dominates for the collision of electrons with heavy atoms over the bremsstrahlung production from the electron via a virtual photon proposed by Holvik and Olsen. Our results complete and correct the studies of those authors.
Gevorkyan S. R.
Kuraev Eduard A.
Schiller Avraham
Serbo Valery G.
Tarasov Victor A.
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