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

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arxiv hep-ph/0009206 v1 pith:HNSQOXP7 submitted 2000-09-18 hep-ph

V. E. Lyubovitskij (Tuebingen University , Tomsk University) , A. Rusetsky (Bern University , HEPI , Tbilisi University) This is my paper · ORCID
classification hep-ph
keywords shiftenergy-levelatomchptorderstronganalysisbreaking
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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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