Contributions for the kaon pair from $\rho(770)$, $\omega(782)$ and their excited states in the $B\to K\bar K h$ decays

TL;DR

This paper analyzes resonance contributions from various $ ho$ and $ ho$-like states in $B o Kar K h$ decays, highlighting the significance of tail contributions from $ ho(770)$ and $ ho(1450)$, and providing predictions consistent with $SU(3)$ symmetry.

Contribution

It provides a detailed study of resonance tail contributions in $B$ decays, emphasizing their importance and offering new predictions for branching fractions.

Findings

Virtual contributions from $ ho(770)$ and $ ho(782)$ tails are larger than from higher resonances.

Differential branching fractions are insensitive to the widths of $ ho(770)$ and $ ho(782)$.

Predicted branching fractions align with $SU(3)$ symmetry expectations.

Abstract

We study the resonance contributions for the kaon pair originating from the intermediate states $\rho(770,1450,1700)$ and $\omega(782,1420,1650)$ for the three-body hadronic decays $B\to K\bar K h$ in the perturbative QCD approach, where $h=(\pi, K)$. The branching fractions of the virtual contributions for $K\bar K$ from the Breit-Wigner formula tails of $\rho(770)$ and $\omega(782)$ which have been ignored in experimental and theoretical studies for these decays are found larger than the corresponding contributions from the resonances $\rho(1450,1700)$ and $\omega(1420,1650)$. The differential branching fractions for $B\to \rho(770) h\to K\bar K h$ and $B\to\omega(782) h \to K\bar K h$ are found nearly unaffected by the quite different values of the full widths for $\rho(770)$ and $\omega(782)$ in this paper. The predictions in this work for the branching fractions of the quasi-two-body decays $B^+\to \pi^+ \rho(1450)^0\to \pi^+K^+K^-$ and $B^+\to \pi^+ \rho(1450)^0\to \pi^+\pi^+\pi^-$ meet the requirement of $SU(3)$ symmetry relation.