Final State Interactions in $D^0 \to K^0 \bar{K^0}$

TL;DR

This paper investigates how final state interactions, including resonance and exchange processes, influence the decay rate of D^0 to K^0 and anti-K^0, providing insights into FSI modeling.

Contribution

It compares s-channel resonance and t-channel exchange models for FSI effects in D^0 decay, highlighting their consistency and ability to reproduce experimental rates.

Findings

Both models roughly agree with each other.

Models can reasonably reproduce the large decay rate.

Resonance and exchange contributions are significant.

Abstract

It is believed that the production rate of $D^0\to K^0\bar K^0$ is almost solely determined by final state interactions (FSI) and hence provides an ideal place to test FSI models. Here we examine model calculations of the contributions from s-channel resonance $f_J(1710)$ and t-channel exchange to the FSI effects in $D^0\to K^0\bar K^0$. The contribution from s-channel $f_0(1710)$ is sma$ For the t-channel FSI evaluation, we employ the one-particle-exchange (OPE) model and Regge model respecti$ The results from two methods are roughly consistent with each other and can reproduce the large rate of $D^0\to K^0\bar K^0$ reasonably well$