Observation of a ppb mass threshoud enhancement in ψ^\prime\toπ^+π^-J/ψ(J/ψ\toγp\bar{p}) decay

Abstract

The decay channel ${\psi }^{\prime }\to {\pi }^{+}{\pi }^{-}J/\psi (J/\psi \to \gamma p\bar{p})$ is studied using a sample of $1.06\times 10^8$ ${\psi }^{\prime }$ events collected by the BESIII experiment at BEPCII. A strong enhancement at threshold is observed in the $p\bar{p}$ invariant mass spectrum. The enhancement can be fit with an $S$-wave Breit-Wigner resonance function with a resulting peak mass of $M=1861_{-13}^{+6}{(\mathrm{stat})}_{-26}^{+7}(\mathrm{syst})MeV/c^2$ and a narrow width that is $\Gamma <38MeV/c^2$ at the 90% confidence level. These results are consistent with published BESII results. These mass and width values do not match with those of any known meson resonance.

5 pages, 3 figures, submitted to Chinese Physics C

References in corpus (2)

• Design and Construction of the BESIII Detector
• Measurement of $\psip$ Radiative Decays

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