The pionium lifetime in generalized chiral perturbation theory

Details The pionium lifetime in generalized chiral perturbation theory The pionium lifetime in generalized chiral perturbation theory

2000-04-25

arxiv.org/abs/hep-ph/0004226v1

Phys.Lett. B490 (2000) 203-212

Physics

High Energy Physics

High Energy Physics - Phenomenology

14 pages, 1 figure (included in the text), Latex

Scientific paper

10.1016/S0370-2693(00)00976-X

Pionium lifetime corrections to the nonrelativistic formula are calculated in the framework of the quasipotential-constraint theory approach. The calculation extends an earlier evaluation, made in the scheme of standard chiral perturbation theory, to the scheme of generalized chiral perturbation theory, in which the quark condensate is left as a free parameter. The pionium lifetime is calculated as a function of the combination $(a_0^0-a_0^2)$ of the $\pi\pi$ S-wave scattering lengths with isospin I=0,2.

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