Four-body Calculation of Inelastic Scattering Cross Sections of Positronium-Antihydrogen Collision

We overview our recent calculations of scattering cross sections of positronium-antihydrogen collisions. We discuss the cross sections calculated in the vicinity of the four-body resonances of (H) over bar Ps and above the energy threshold for the formation of the antihydrogen positive ions ((H) over bar (+)). In the former energy region where a Rydberg series of resonances dominated by the (H) over bar (+)-e(-) interaction appears, we showa good agreement between the resonant profiles in the cross sections and the resonance energies calculated by the complex coordinate rotationmethod. (H) over bar (+) production cross sections near the threshold energy are reported for the positronium being initially in the (n, l) states with n <= 3, together with all competing elastic/inelastic cross sections. Comparison of our results with the latest continuum distorted wave final state calculation is presented. A qualitative discrepancy concerning the dependence of cross sections on the angular momentum of Ps is indicated.

Automated summary

The paper provides an overview of recent calculations on the scattering cross sections of positronium-antihydrogen collisions, focusing on the four-body resonances near the energy threshold for antihydrogen positive ions formation. A good agreement is shown between the resonant profiles in the cross sections and the resonance energies calculated using complex coordinate rotation method. The study also reports on the production cross sections near threshold energy and highlights a qualitative discrepancy in the dependence of cross sections on the angular momentum of Ps.