https://doi.org/10.1140/epja/s10050-025-01699-y
Regular Article - Theoretical Physics
Charge symmetry breaking effects of 
-
mixing in relativistic mean-field model
1
Department of Physics and Origin of Matter and Evolution of Galaxies Institute, Soongsil University, 06978, Seoul, Korea
2
RIKEN Center for Interdisciplinary Theoretical and Mathematical Sciences (iTHEMS), RIKEN, 351-0198, Wako, Japan
3
Department of Physics, Graduate School of Science, The University of Tokyo, 113-0033, Tokyo, Japan
4
Center for Mathematics and Physics, University of Aizu, 965-8560, Aizu-Wakamatsu, Japan
5
RIKEN Nishina Center, RIKEN, 351-0198, Wako, Japan
Received:
24
July
2025
Accepted:
12
September
2025
Published online:
8
October
2025
We present a relativistic mean-field model that incorporates charge symmetry breaking (CSB) of nuclear force via the 
-
meson mixing, along with corrections to the electromagnetic interaction including the nucleon form factors, first-order vacuum polarization, and Coulomb exchange and pairing terms. The model parameters are refitted using the mass differences of 
mirror nuclei and ground-state properties of magic nuclei, yielding DD-ME-CSB parameter set. The DD-ME-CSB parameter set reproduces the mass differences of mirror nuclei reasonably well up to 
, demonstrating the importance of - mixing. A connection of the present model to a Skyrme-type CSB interaction is also established through a gradient expansion of the energy density functional.
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© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2025
Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
