Phenomenology of isospin-symmetry breaking with vector mesons
Physical Review D(2024)
摘要
We study the effect of isospin-symmetry breaking in the framework of the
extended Linear Sigma Model (eLSM) in vacuum. In this model, several particles
mix with each other at tree level, due to the three non-zero scalar condensates
(non-strange, strange, isospin). We resolve these mixings with the help of
various field transformations. We compute all possible meson mixings and decay
widths at tree level and perform a χ^2 fit to PDG data. A very good fit is
found if we exclude the (very small ∼ 130 keV) ω→ππ decay.
We also investigate the violation of Dashen's theorem.
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