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First Measurement of the Branching Ratio of $J/ψ\toγf_{2}(1270) f_{2}(1270)$

BES Collaboration·M. Ablikim
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Abstract

Using 58 million $J/ψ$ events taken with the BES II detector at the Beijing Electron Positron Collider, a new decay mode $J/ψ\toγf_{2}(1270) f_{2}(1270) \to γπ^+π^-π^+π^-$ is observed for the first time. The branching ratio is determined to be $Br(J/ψ\toγf_{2}(1270) f_{2}(1270))=(9.5\pm0.7\pm1.6)\times 10^{-4}$, where the quoted errors are statistical and systematic, respectively.

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BES Collaboration, M. Ablikim. 2004-08-10. First Measurement of the Branching Ratio of $J/ψ\toγf_{2}(1270) f_{2}(1270)$. https://doi.org/10.1103/physrevd.70.112008

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