On the width of the K−D atom ground state

N. Barnea; E. Friedman; A. Gal

doi:10.1016/j.nuclphysa.2020.122112

On the width of the K⁻D atom ground state

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

^*Corresponding author for this work

Racah Institute of Physics

Research output: Contribution to journal › Article › peer-review

Abstract

Experiments at DAΦNE-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 Γ_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 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 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.

Original language	American English
Article number	122112
Journal	Nuclear Physics A
Volume	1006
DOIs	https://doi.org/10.1016/j.nuclphysa.2020.122112
State	Published - 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.

Keywords

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

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10.1016/j.nuclphysa.2020.122112

Cite this

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title = "On the width of the K−D atom ground state",

abstract = "Experiments at DAΦNE-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 Γ1S≲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 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 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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author = "N. Barnea and E. Friedman and A. Gal",

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: {\textcopyright} 2020 Elsevier B.V.",

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AU - Friedman, E.

AU - Gal, A.

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N2 - Experiments at DAΦNE-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 Γ1S≲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 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 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.

AB - Experiments at DAΦNE-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 Γ1S≲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 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 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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