On the width of the KD atom ground state

N. Barnea, E. Friedman, A. Gal*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Experiments at DAΦNE-Frascati and at J-PARC are scheduled to produce KD 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 Γ1S≲1 keV will ensure good resolution of the X-ray transitions feeding the 1S g.s. Here we study the expected KD 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 KD atom 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 KD atom 1S g.s., in fair agreement with genuinely three-body KD atom calculations. Comparison is made with πD atom phenomenology.

Original languageAmerican English
Article number122112
JournalNuclear Physics A
StatePublished - Feb 2021

Bibliographical note

Funding Information:
We thank Zhan-Wei Liu and Wolfram Weise for useful remarks on the previous version. The work of NB was supported by the PAZY Foundation and by the ISF grant No. 1308/16. The work of all three authors is supported by the European Union's Horizon 2020 research and innovation programme under grant agreement No. 824093.

Publisher Copyright:
© 2020 Elsevier B.V.


  • K-nucleon and K-nucleus interactions near threshold
  • Kaonic atoms
  • Kaonic deuterium (KD)


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