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arxiv 1001.5328 v1 pith:DCNHUGV3 submitted 2010-01-29 hep-ex

Observation of a ppb mass threshoud enhancement in psi^primetoπ^+π^-J/psi(J/psitoγ pbar{p}) decay

classification hep-ex
keywords massenhancementgammaprimedecayresonanceresultswidth
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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 $M=1861^{+6}_{-13} {\rm (stat)}^{+7}_{-26} {\rm (syst)} {\rm MeV/}c^2$ and a narrow width that is $\Gamma<38 {\rm MeV/}c^2$ 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.

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