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Antihydrogen formation from laser-assisted antiproton-positronium collisions

K. Lévêque-Simon* and P.-A. Hervieux†

  • Université de Strasbourg, CNRS, Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504, F-67000 Strasbourg, France

  • *kevin.leveque-simon@sorbonne-universite.fr
  • †hervieux@unistra.fr
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Phys. Rev. A 107, 052813 – Published 30 May, 2023

DOI: https://doi.org/10.1103/PhysRevA.107.052813

Abstract

The formation of antihydrogen atoms from three-body collisions between positronium atoms and antiprotons plays a crucial role in the gravitational behavior of antihydrogen at rest (GBAR) experiment devoted to the measure of the action of gravity on antimatter. One of the main challenges facing this experiment is to find the means for increasing the production of antihydrogens which are produced by the reaction p¯+Ps→H¯+e− with an extremely low rate. Along these lines, we investigate here the possibility to influence the collision process by using a laser field. A perturbative approach combining the Coulomb-Born approximation for modeling the charged-particle collision and a first-order perturbation theory for describing laser-atom interactions is employed to estimate laser-mediated charge-exchange cross sections. By carefully considering the laser specifications compatible with the experimental constraints, we present an extensive study of the influence of the laser parameters (laser wavelength and intensity) on the cross sections in the energy range of interest for GBAR. We show that under special irradiation conditions the rate of antihydrogen production may be significantly increased by the presence of the laser field.

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Phys. Rev. A 107, 052813– Published 30 May, 2023
  • Received 7 December 2022
  • Accepted 8 May 2023
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