Final state interaction in $K\to 2\pi$ decay

TL;DR

This paper challenges the common belief that final state interactions (FSI) enhance the $K o 2\pi$ decay amplitude, arguing instead that FSI does not increase its absolute value, providing a new perspective on decay dynamics.

Contribution

It presents a theoretical argument against the widely held view that FSI enhances the $K o 2\pi$ decay amplitude, offering a novel interpretation of FSI effects.

Findings

FSI does not increase the absolute value of the $K o 2\pi$ decay amplitude.

Challenges the conventional opinion on FSI's role in kaon decays.

Provides a theoretical basis for re-evaluating FSI effects in decay processes.

Abstract

Contrary to wide-spread opinion that the final state interaction (FSI) enhances the amplitude $<2\pi;I=0|K^0>$, we argue that FSI does not increase the absolute value of this amplitude.