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 Γ of 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, K_α, K_β, and K_γ, was disentangled for the first time.
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Beer et al. (2005) studied this question.
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