K→ππand a light scalar meson

J. C. R. Bloch, M. A. Ivanov, T. Mizutani, C. D. Roberts, S. M. Schmidt
2000 Physical Review C  
We explore the Delta-I= 1/2 rule and epsilon'/epsilon in K -> pi pi transitions using a Dyson-Schwinger equation model. Exploiting the feature that QCD penguin operators direct K^0_S transitions through 0^++ intermediate states, we find an explanation of the enhancement of I=0 K -> pi pi transitions in the contribution of a light sigma-meson. This mechanism also affects epsilon'/epsilon.
doi:10.1103/physrevc.62.025206 fatcat:4fwpqm52gfc23arcmgvqv7rama