On epsilonK beyond lowest order in the Operator Product Expansion
Abstract
We analyse the structure of long distance (LD) contributions to the CP-violating parameter epsilonK, that generally affect both the absorptive (Gamma12) and the dispersive (M12) parts of the K0 -- K0bar mixing amplitude. We point out that, in a consistent framework, in addition to LD contributions to Im(Gamma12), estimated recently by two of us, also LD contributions to Im(M12) have to be taken into account. Estimating the latter contributions the impact of LD effects on epsilonK is significantly reduced (from -6.0 % to -3.6 %). The overall effect of LD corrections and of the superweak phase being different from 45 degrees is summarised by the multiplicative factor kappaepsilon = 0.94 +/- 0.02.
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