On the width of the K-D atom ground state
Abstract
Experiments at DA-Frascati and at J-PARC are scheduled to produce K-D atoms and observe their X-ray cascade down to the 1S ground state (g.s.), thereby measuring its strong-interaction width and shift away from a purely Coulomb state. A width 1S 1 keV will ensure good resolution of the X-ray transitions feeding the 1S g.s. Here we study the expected K-D 1S g.s. width from the perspective of global fits to level shifts and widths in heavier kaonic atoms across the periodic table, using K- nuclear optical potentials constructed from K N chiral interaction models. Special attention is paid to the subthreshold energy at which the K N subsystem interacts in the K-D atomic g.s. Within this approach we predict strong-interaction upward level shift of close to 700 eV and width of about 1.2 to 1.3 keV for the K-D atom 1S g.s., in fair agreement with genuinely three-body K-D atom calculations. Comparison is made with π-D atom phenomenology.
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