pi(-)p atom in ChPT: strong energy-level shift

Details pi(-)p atom in ChPT: strong energy-level shift pi(-)p atom in ChPT: strong energy-level shift

2000-09-18

arxiv.org/abs/hep-ph/0009206v1

Phys.Lett. B494 (2000) 9-18

Physics

High Energy Physics

High Energy Physics - Phenomenology

16 pages, LaTeX-file, 1 Figure

Scientific paper

10.1016/S0370-2693(00)01185-0

The general formula of the pi(-)p atom strong energy-level shift in the 1s state is derived in the next-to-leading order in the isospin breaking, and in all orders in chiral expansion. Isospin-breaking corrections to the level shift are explicitly evaluated at order p^2 in ChPT. The results clearly demonstrate the necessity to critically reaccess the values of the piN scattering lengths, extracted from the energy-level shift measurement by means of the potential model-based theoretical analysis.

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