Pionium lifetime corrections

Details Pionium lifetime corrections Pionium lifetime corrections

1998-09-17

arxiv.org/abs/hep-ph/9809425v1

Proceedings, Dubna (1998) 50-58

Physics

High Energy Physics

High Energy Physics - Phenomenology

9 pages, Latex. Uses Dubna98.sty. Talk given at the Int. Workshop "Hadronic Atoms and Positronium in the Standard Model", Dubn

Scientific paper

Pionium lifetime corrections are evaluated in the frameworks of constrained Bethe-Salpeter equation and chiral perturbation theory. Corrections of order $O(\alpha)$ are calculated with respect to the conventional lowest-order formula, in which the strong interaction amplitude has been calculated to two-loop order with charged pion masses. The total correction is found to be of the order of $(6.1\pm 2.0)%$.

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