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

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

2004-08-10

arxiv.org/abs/hep-ex/0408026v1

Phys.Rev.D70:112008,2004

Physics

High Energy Physics

High Energy Physics - Experiment

7 pages, 3 figures

Scientific paper

10.1103/PhysRevD.70.112008

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

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