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- W2322017071 abstract "We analyze the influence of ensuremath{sigma} meson exchange on the main non-mesonic hypernuclear weak decay observables: Total rate ${ensuremath{Gamma}}_{mathrm{NM}}$, neutron-to-proton branching ratio ${ensuremath{Gamma}}_{n/p}$, and proton asymmetry parameter ${a}_{ensuremath{Lambda}}$. The ensuremath{sigma} meson exchange is added to the standard strangeness-changing weak $ensuremath{Lambda}Nensuremath{rightarrow}mathit{NN}$ transition potential, which includes the exchange of the complete pseudoscalar and vector mesons octet ($ensuremath{pi},ensuremath{eta},K,ensuremath{rho},ensuremath{omega},{K}^{*}$). Using a shell model formalism, the ensuremath{sigma} meson weak coupling constants are adjusted to reproduce the recent ${ensuremath{Gamma}}_{mathrm{NM}}$ and ${ensuremath{Gamma}}_{n/p}$ experimental data for ${}_{ensuremath{Lambda}}^{5}mathrm{He}$. Numerical results for the remaining observables of ${}_{ensuremath{Lambda}}^{5}mathrm{He}$ and all the observables of ${}_{ensuremath{Lambda}}^{12}C$ decays are presented. They clearly show that the addition of the ensuremath{sigma} meson improves the agreement with the data. However, its effect it is not enough to reproduce well the ${a}_{ensuremath{Lambda}}$ values, which means that other improvements of the model must be explored to explain the puzzle posed by the experiments." @default.
- W2322017071 created "2016-06-24" @default.
- W2322017071 creator A5050980819 @default.
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- W2322017071 date "2006-02-13" @default.
- W2322017071 modified "2023-10-17" @default.
- W2322017071 title "σ meson exchange effect on non-mesonic hypernuclear weak decay observables" @default.
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- W2322017071 doi "https://doi.org/10.1103/physrevc.73.024309" @default.
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