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nucl-th2005
On kaonic hydrogen. Phenomenological quantum field theoretic model revisited
A. N. Ivanov, M. Cargnelli, M. Faber +5
We argue that due to isospin and U-spin invariance of strong low-energy interactions the S-wave scattering lengths a^0_0 and a^1_0 of bar-KN scattering with isospin I=0 and I = 1 s…
nucl-th2003
On pionic hydrogen. Quantum field theoretic, relativistic covariant and model-independent approach
A. N. Ivanov, M. Faber, A. Hirtl +2
We consider pionic hydrogen A_(pi p), the bound pi^- p state. Within the quantum field theoretic and relativistic covariant approach we calculate the shift and width of the energy…