K -> pi pi and a light scalar meson

Physics – Nuclear Physics – Nuclear Theory

Scientific paper

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7 pages, REVTEX

Scientific paper

10.1103/PhysRevC.62.025206

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.

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