Measurement Of The Kaonic Hydrogen X-Ray Spectrum

Mulhauser, F.; Curceanu-Petrascu, C.; Beer, G.; Bragadireanu, A.M.; Schaller, L.A.; Iliescu, M.; Itahashi, K.; Ludhova, L.; Egger, J.-P.; Kienle, P.; Ishiwatari, T.; Koike, T.; Sirghi, F.; Fuhrmann, H.; Lucherini, V.; Zmeskal, J.; Guaraldo, C.; Lauss, B.; Ponta, T.; Cargnelli, M.; Sirghi, D.L.; Seki, Ryoichi; Marton, J.; Iwasaki, M.

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Measurement Of The Kaonic Hydrogen X-Ray Spectrum

The DEAR (DAΦNE exotic atom research) experiment measured the energy of x rays emitted in the transitions to the ground state of kaonic hydrogen. The measured values for the shift ϵ and the width Γof the 1s state due to the K−p strong interaction are ϵ1s=−193±37 (stat) ±6 (syst) eV and Γ1s=249±111 (stat) ±30 (syst) eV, the most precise values yet obtained. The pattern of the kaonic hydrogen K-series lines, Kα, Kβ, and Kγ, was disentangled for the first time.

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