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arXiv · 2511.08308

Excited $Σ$ states of the hydrogen-antihydrogen molecule

L. Brumm·J. Schürmann·A. Saenz
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Abstract

Adopting explicitly correlated Kolos-Wolniewicz-type basis functions, the Born-Oppenheimer potential curves of a number of excited $Σ$ states of the hydrogen-antihydrogen system ($\bar{\rm H}$) were calculated for both, even and odd, Q symmetries, including also free positronium states. It is demonstrated that the excited leptonic states support ro-vibrational states with energies close to the ground-state dissociation threshold. As a consequence, the excited leptonic states need to be considered in theoretical treatments of ground-state H-$\bar{\mathrm{H}}$ collisions.

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L. Brumm, J. Schürmann, A. Saenz. 2025-11-11. Excited $Σ$ states of the hydrogen-antihydrogen molecule. https://doi.org/10.1103/x3xl-sxzr

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