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

Abstract

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.

16 pages, LaTeX-file, 1 Figure

References in corpus (4)

• Virtual photons in baryon chiral perturbation theory
• On the Lifetime of the pi+pi- Atom
• Numerical analysis of the pi+pi- atom lifetime in ChPT
• Precision determination of the pi-N scattering lengths and the charged pi-NN coupling constant

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