Abstract
We compute the energy-level displacement of the excited $np$ states of kaonic hydrogen within the quantum field theoretic and relativistic covariant model of strong low-energy $\overline{K}N$ interactions suggested by [Ivanov et al.Eur. Phys. J. A 21, 11 (2004)]. For the width of the energy-level of the excited $2p$ state of kaonic hydrogen, caused by strong low-energy interactions, we find ${\ensuremath{\Gamma}}_{2p}=2\phantom{\rule{0.3em}{0ex}}\mathrm{meV}=3\ifmmode\times\else\texttimes\fi{}{10}^{12}\phantom{\rule{0.3em}{0ex}}{\mathrm{s}}^{\ensuremath{-}1}$. This result is important for the theoretical analysis of the x-ray yields in kaonic hydrogen.
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