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- W1968809750 abstract "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." @default.
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- W1968809750 date "2011-10-01" @default.
- W1968809750 modified "2023-09-29" @default.
- W1968809750 title "A new measurement of kaonic hydrogen X-rays" @default.
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- W1968809750 doi "https://doi.org/10.1016/j.physletb.2011.09.011" @default.
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