Observation of $J/\psi \to p\bar{p}{a}_0(980)$ at BESIII

Abstract

Using $2.25\times 10^8$ $J/\psi$ events collected with the BESIII detector at the BEPCII storage rings, we observe for the first time the process $J/\psi \to p\bar{p}{a}_0(980)$, $a_0(980)\to {\pi }^0\eta$ with a significance of $6.5\sigma$ ($3.2\sigma$ including systematic uncertainties). The product branching fraction of $J/\psi \to p\bar{p}{a}_0(980)\to p\bar{p}{\pi }^0\eta$ is measured to be $(6.8\pm 1.2\pm 1.3)\times 10^{-5}$, where the first error is statistical and the second is systematic. This measurement provides information on the $a_0$ production near threshold coupling to $p\bar{p}$ and improves the understanding of the dynamics of $J/\psi$ decays to four body processes.

arXiv comment8 pages, 7 figures

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• Design and Construction of the BESIII Detector
• Chiral Dynamics in Nucleons and Nuclei
• The Precision Monte Carlo Event Generator KK For Two-Fermion Final States In e+e- Collisions
• Coherent Exclusive Exponentiation For Precision Monte Carlo Calculations
• Chiral Perturbation Theory
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Cited by in corpus (5)

• An $a_0$ resonance in strongly coupled $\pi \eta$, $K\overline{K}$ scattering from lattice QCD
• Observation of $J/\psi \to \gamma \eta {\pi }^0$
• Enhancement near the $\bar{p}\Lambda$ threshold in the ${\chi }_{c0}\to \bar{p}{K}^{+}\Lambda$ reaction
• $N^{\ast }$ Production from $e^{+}{e}^{-}$ Annihilations
• Monte Carlo Simulation-Based Partial Wave Analysis of ${\Xi }_c^{+}\to {\Xi }^{-}{\pi }^{+}{\pi }^{+}$ Decay