Precision measurement of the branching fraction of \boldmath $J/\psi\rightarrow K^+K^-$ via $\psi(2S)\rightarrow \pi^+\pi^-J/\psi$
Branching (polymer chemistry)
Branching fraction
DOI:
10.48550/arxiv.2405.12809
Publication Date:
2024-05-21
AUTHORS (629)
ABSTRACT
Using a sample of $448.1 \times 10^6$ $\psi(2S)$ events collected with the BESIII detector, we perform study decay $J/\psi\rightarrow K^+K^-$ via $\psi(2S)\rightarrow \pi^+\pi^-J/\psi$. The branching fraction is determined to be $\mathcal{B}_{K^+K^-}=(3.072\pm 0.023({\rm stat.})\pm 0.050({\rm syst.}))\times 10^{-4}$, which consistent previous measurements but significantly improved precision.
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