Dimesoatom breakup in the Coulomb field

L. G. Afanasyev; S. R. Gevorkyan; O. O. Voskresenskaya

doi:10.1140/epja/s10050-019-00017-7

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2024 Impact factor 2.8

Hadrons and Nuclei

Eur. Phys. J. A (2020) 56: 10
https://doi.org/10.1140/epja/s10050-019-00017-7

Regular Article - Theoretical Physics

Dimesoatom breakup in the Coulomb field

L. G. Afanasyev, S. R. Gevorkyan and O. O. Voskresenskaya^*

Joint Institute for Nuclear Research, Dubna, Moscow Region, 141980, Russia

^* e-mail: voskr@jinr.ru

Received: 15 August 2019
Accepted: 31 October 2019
Published online: 14 January 2020

Abstract

Momentum and angular distributions of charged meson pairs $$h^+h^-$$ ( $h=\pi , K$ ) from elementary atom (EA) breakup (ionization) in the Coulomb field of a target atom are considered in the Born and Glauber approximations. Exploiting the fact that the atomic screening of the target Coulomb potential is important at small transfer momenta, while multi-photon exchanges are essential at large transfer momenta, we express the cross sections of EA breakup as a sum of two terms. In the region of modest transfer momenta the cross section is determined by the single-photon exchange (first Born approximation) accounting for the target atoms screening, whereas at large transfer momenta using the unscreened potential allows one to take into account all multi-photon exchanges and obtain the cross section of EA breakup in closed analytical form.