Measurement of the branching fractions for $J/ψ\toγπ^0$, $γη$ and $γη^{\prime}$

Details Measurement of the branching fractions for $J/ψ\toγπ^0$, $γη$ and $γη^{\prime}$ Measurement of the branching fractions for $J/ψ\toγπ^0$, $γη$ and $γη^{\prime}$

2005-10-25

arxiv.org/abs/hep-ex/0510066v1

Phys.Rev.D73:052008,2006

Physics

High Energy Physics

High Energy Physics - Experiment

20 pages, 10 figures

Scientific paper

10.1103/PhysRevD.73.052008

The decay modes $\jpsi\ar\gamma\pi^0, \gamma\eta$ and $\gamma\etap$ are analyzed using a data sample of 58 million $\jpsi$ decays collected with the BESII detector at BEPC. The branching fractions are determined to be: $Br(\jpsi\ar\gamma\pi^0)=(3.13^{+0.65}_{-0.44})\times10^{-5}$, $Br(\jpsi\ar\gamma\eta)=(11.23\pm0.89)\times10^{-4}$, and $Br(\jpsi\ar\gamma\etap)=(5.55\pm0.44)\times10^{-3}$, where the errors are combined statistical and systematic errors. The ratio of partial widths $\Gamma(\jpsi\ar\gamma\etap)/\Gamma(\jpsi\ar\gamma\eta)$ is measured to be $4.94\pm0.40$, and the singlet-octet pseudoscalar mixing angle of $\eta-\etap$ system is determined to be $\theta_{P}=(-22.08\pm0.81)^{\circ}$.

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