The aim in this manuscript is to clarify the progress in understanding the nature of the K̄N interaction at the lowest energy, given by the recent kaonic hydrogen X-ray experiment at KEK . We have observed a clear spectrum showing the kaonic hydrogen Kα line, for the first time. The analysis gives the repulsive energy shift to be ΔE(1s) = -323 ± 63(statistical) ± 11 (systematic) eV and the energy width to be Γ(1s) = 407 ± 208 ± 100 eV. This result is consistent with analyses of the previous low-energy scattering data and resolves the long-standing kaonic hydrogen puzzle.
ASJC Scopus subject areas
- Nuclear and High Energy Physics