Energy-level displacement of excited np states of kaonic hydrogen (11 pages)

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 KN 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 {gamma}{sub 2p}=2 meV=3x10{sup 12} s{sup -1}. This result is important for the theoretical analysis of the x-ray yields in kaonic hydrogen.