Measurement of the branching fraction for $\psi(3686)\to\omega K^+ K^-$

TL;DR

This paper reports the most precise measurement to date of the branching fraction for $b8(3686)b4 e a9 K^+ K^-$ using a large sample of $b8(3686)$ events, improving the test of the 12% rule.

Contribution

The study provides the most accurate measurement of the branching fraction for $b8(3686)b4 e a9 K^+ K^-$ and refines the test of the 12% rule with improved experimental techniques.

Findings

Branching fraction measured as (1.54 b1 0.04 b1 0.11) imes 10^{-4}.

Ratio of branching fractions is (18.4 b1 3.7)% for $b8(3686)$ to $J/\u03a9$ decays.

Provides the most precise result to date for this decay mode.

Abstract

With $1.06\times 10^8$ $\psi(3686)$ events collected with the BESIII detector, the branching fraction of $\psi(3686) \to \omega K^+ K^-$ is measured to be $(1.54 \pm 0.04 \pm 0.11) \times 10^{-4}$. This is the most precise result to date, due to the largest $\psi(3686)$ sample, improved signal reconstruction efficiency, good simulation of the detector performance, and a more accurate knowledge of the continuum contribution. Using the branching fraction of $J/\psi \to \omega K^+ K^-$, the ratio $\mathcal{B}(\psi(3868) \to K^+K^-) / \mathcal{B}(J/\psi \to K^+K^-)$ is determined to be $(18.4 \pm 3.7)\,\%$. This constitutes a significantly improved test of the $12\,\%$ rule, with the uncertainty now dominated by the $J/\psi$ branching fraction.