Pion-pion interaction andK
2x03C0;x03C0;x03C0;-decay |
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Authors: | P Stichel G Roepstorff G Kramer |
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Institution: | 1. Physikalischen Staatsinstitut in Hamburg-Bahrenfeld, Hamburg-Bahrenfeld
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Abstract: | The enhancement of theK 2π + -decay compared to theK 2π 0 -decay is discussed on the basis of the\(|\mathop {\Delta {\rm I}}\limits^ \to | = \tfrac{1}{2}\)-rule. The enhancement factor is calculated by dispersion methods which yield an expression depending only on the phase shift of the two pion system in theJ=0,I=0,2 state. This expression has been studied in the framework of simple models for the two-pion interaction in order to obtain a survey of the possibilities for the cause of the anomalous large ratioK 2π + /K 2π 0 . Only characteristic cases have been considered and, as far as possible, experimental results of theπ-π-interaction are taken into account. |
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