E835 at FNAL: Charmonium Spectroscopy in $\bar p p$ Annihilations

Details E835 at FNAL: Charmonium Spectroscopy in $\bar p p$ Annihilations E835 at FNAL: Charmonium Spectroscopy in $\bar p p$ Annihilations

2004-10-28

arxiv.org/abs/hep-ex/0410085v1

Physics

High Energy Physics

High Energy Physics - Experiment

Presented at the 6th International Conference on Hyperons, Charm and Beauty Hadrons (BEACH 2004), Chicago(Il), June 27-July 3,

Scientific paper

10.1063/1.1799766

I present preliminary results on the search for $h_c$ in its $\eta_c\gamma$ and $J/\psi\pi^0$ decay modes. We observe an excess of \eta_c\gamma$ events near 3526 MeV that has a probability ${\cal P} \sim 0.001$ to arise from background fluctations. The resonance parameters are $M=3525.8 \pm 0.2 \pm 0.2 $MeV, $\Gamma\leq$ 1 MeV, and $10.6\pm 3.7\pm3.4(br) < \Gamma_{\bar{p}p}B_{\eta_c\gamma} < 12.8\pm 4.8\pm4.5(br) $eV. We find no event excess within the search region in the $J/\psi\pi^0$ mode.

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