Abstract
Long range effects may well dominate the K LK S mass difference. The most important of these is that of the virtual two-pion intermediate state. This is computed using the most reliable presently available data on I = 0 S-wave dipion production. This is found to contribute 46±13% of the observed mass difference. The assumptions about the K → ππ interaction needed to perform this calculation are detailed and a comparison is made with other recent evaluations.
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