Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2011-05-16
Phys.Lett.B704:113-117,2011
Physics
Nuclear Physics
Nuclear Experiment
5 figures, submitted to Physics Letters B
Scientific paper
10.1016/j.physletb.2011.09.011
The $\bar{K}N$ system at threshold is a sensitive testing ground for low energy QCD, especially for the explicit chiral symmetry breaking. Therefore, we have measured the $K$-series x rays of kaonic hydrogen atoms at the DA$\Phi$NE electron-positron collider of Laboratori Nazionali di Frascati, and have determined the most precise values of the strong-interaction energy-level shift and width of the $1s$ atomic state. As x-ray detectors, we used large-area silicon drift detectors having excellent energy and timing resolution, which were developed especially for the SIDDHARTA experiment. The shift and width were determined to be $\epsilon_{1s} = -283 \pm 36 \pm 6 {(syst)}$ eV and $\Gamma_{1s} = 541 \pm 89 {(stat)} \pm 22 {(syst)}$ eV, respectively. The new values will provide vital constraints on the theoretical description of the low-energy $\bar{K}N$ interaction.
Bazzi M.
Beer G.
Bombelli Luca
Bragadireanu A. M.
Cargnelli Michael
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