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VOLUME 54 (1991) | ISSUE 10 | PAGE 557
New measurements of the mass of the K- meson
The energy of the 4f-3d transition in the К ~2 С atom has been measured with the help of a Cauchois crystal diffraction spectrometer at the proton synchrotron of the Institute of High-Energy Physics. A new value has been found for the mass of К ~ meson: 493.6960 ± 0.0059 MeV. This figure is significantly different from the previously accepted value.