Year: 2000
Type: article
Abstract: We explore the $\ensuremath{\Delta}I=\frac{1}{2}$ rule and ${\ensuremath{\epsilon}}^{\ensuremath{'}}/\ensuremath{\epsilon}$ in $\stackrel{\ensuremath{\rightarrow}}{K}\ensuremath{\pi}\ensuremath{\pi}$ transitions using a Dyson-Schwinger equation model. Exploiting the feature that quantum chromodynamics penguin operators direct ${K}_{S}^{0}$ transitions through ${0}^{++}$ intermediate states, we observe an enhancement of $\stackrel{\ensuremath{\rightarrow}}{K}\ensuremath{\pi}{\ensuremath{\pi}}_{I=0}$ transitions from the contribution of a putative light $\ensuremath{\sigma}$-meson. This mechanism also affects ${\ensuremath{\epsilon}}^{\ensuremath{'}}/\ensuremath{\epsilon}.$
Source: Physical Review C
Language: Latvian
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W1561624180