Isospin symmetry breaking in double-pion production in the region of d*(2380) and the scalar σ mesonстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 4 августа 2021 г.
Аннотация:The first attempt is made to provide a quantitative theoretical interpretation of the WASA-at-COSY experimental data on the basic double-pion production reactions pn→dπ0π0 and pn→dπ+π− in the energy region Tp=1–1.3 GeV [Adlarson et al., Phys. Lett. B 721, 229 (2013)]. The data are analyzed within a model based on the production and decay of an intermediate I(JP)=0(3+) dibaryon resonance D03 [also denoted as d∗(2380)]. The observed decrease of the near-threshold enhancement (the so-called ABC effect) in the reaction pn→dπ+π− in comparison to that in the reaction pn→dπ0π0 is explained (at least partially) to be due to isospin symmetry violation in the two-pion decay of an intermediate near-threshold scalar σ meson emitted from the D03 dibaryon resonance under conditions of partial chiral symmetry restoration.