Decay of kaonium in a chiral approach

Details Decay of kaonium in a chiral approach Decay of kaonium in a chiral approach

2011-02-07

arxiv.org/abs/1102.1391v4

Phys.Lett.B702:235-241,2011

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages, 2 figures. Added new reference to isospin-breaking of scattering length

Scientific paper

10.1016/j.physletb.2011.07.002

The decay of the K+K- hadronic atom kaonium is investigated non-perturbatively using meson-meson interaction amplitudes taken from leading order chiral perturbation theory in an approach adapted from that proposed by Oller and Oset [18]. The Kudryavtsev-Popov eigenvalue equation is solved numerically for the energy shift and decay width due to strong interactions in the 1s state. These calculations introduce a cutoff ~ 1.4 GeV in O(4) momentum space that is necessary to regulate divergent loop contributions to the meson-meson scattering amplitudes in the strong-interaction sector. One finds lifetimes of 2.2 \pm 0.9 x 10-18s for the ground state of kaonium.

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