Measurements of the Mass and Full-Width of the $η_c$ Meson

Details Measurements of the Mass and Full-Width of the $η_c$ Meson Measurements of the Mass and Full-Width of the $η_c$ Meson

2003-01-06

arxiv.org/abs/hep-ex/0301004v1

Phys.Lett.B555:174-180,2003

Physics

High Energy Physics

High Energy Physics - Experiment

9 pages, 2 figures and 4 table. Submitted to Phys. Lett. B

Scientific paper

10.1016/S0370-2693(03)00074-1

In a sample of 58 million $J/\psi$ events collected with the BES II detector, the process J/$\psi\to\gamma\eta_c$ is observed in five different decay channels: $\gamma K^+K^-\pi^+\pi^-$, $\gamma\pi^+\pi^-\pi^+\pi^-$, $\gamma K^\pm K^0_S \pi^\mp$ (with $K^0_S\to\pi^+\pi^-$), $\gamma \phi\phi$ (with $\phi\to K^+K^-$) and $\gamma p\bar{p}$. From a combined fit of all five channels, we determine the mass and full-width of $\eta_c$ to be $m_{\eta_c}=2977.5\pm1.0 ({stat.})\pm1.2 ({syst.})$ MeV/$c^2$ and $\Gamma_{\eta_c} = 17.0\pm3.7 ({stat.})\pm7.4 ({syst.})$ MeV/$c^2$.

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