Strong Enhancement of $ε'/ε$ Through Final State Interactions

Details Strong Enhancement of $ε'/ε$ Through Final State Interactions Strong Enhancement of $ε'/ε$ Through Final State Interactions

1999-11-04

arxiv.org/abs/hep-ph/9911233v2

Phys.Rev.Lett. 84 (2000) 2568-2571

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, uses RevTex, a footnote added

Scientific paper

10.1103/PhysRevLett.84.2568

We quantify the important effect of strong final state interactions in the weak $K\to2\pi$ amplitudes, using the measured $\pi$--$\pi$ phase shifts with J=0 and $I=0,2$. The final rescattering of the two pions provides a strong enhancement of the $\Delta I =1/2$ amplitude, which so far has been neglected in the theoretical predictions of $\epsilon'/\epsilon$. This correction increases the Standard Model prediction of $\epsilon'/\epsilon$ to values in good agreement with the experimental measurements.

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