First study of reaction ${\Xi }^{0}n\to {\Xi }^{-}p$ using ${\Xi }^0$-nucleus scattering at an electron-positron collider

Abstract

Using $(1.0087\pm 0.0044)\times 10^{10}$ $J/\psi$ events collected with the BESIII detector at the BEPCII storage ring, the process ${\Xi }^{0}n\to {\Xi }^{-}p$ is studied, where the ${\Xi }^0$ baryon is produced in the process $J/\psi \to {\Xi }^0{\bar{\Xi }}^0$ and the neutron is a component of the ${}^9\mathrm{Be}$, ${}^{12}\mathrm{C}$ and ${}^{197}\mathrm{Au}$ nuclei in the beam pipe. A clear signal is observed with a statistical significance of $7.1\sigma$. The cross section of the reaction ${\Xi }^0+{}^9\mathrm{Be}\to {\Xi }^{-}+p+{}^8\mathrm{Be}$ is determined to be $\sigma ({\Xi }^0+{}^9\mathrm{Be}\to {\Xi }^{-}+p+{}^8\mathrm{Be})=(22.1\pm 5.3_{\mathrm{stat}}\pm 4.5_{\mathrm{sys}})$ mb at the ${\Xi }^0$ momentum of $0.818$ GeV/$c$, where the first uncertainty is statistical and the second is systematic. No significant $H$-dibaryon signal is observed in the ${\Xi }^{-}p$ final state. This is the first study of hyperon-nucleon interactions in electron-positron collisions and opens up a new direction for such research.

arXiv comment13 pages, 7 figures, with Supplemental Material

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Cited by in corpus (9)

• Prospects to study hyperon-nucleon interactions at BESIII
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• Precise measurement of the branching fractions of $J/\psi \to \bar{\Lambda }{\pi }^{+}{\Sigma }^{-}+c.c.$ and $J/\psi \to \bar{\Lambda }{\pi }^{-}{\Sigma }^{+}+c.c.$
• Understanding of the BESIII measurement of (anti)hyperon-nucleon scattering
• Observation of the Electromagnetic Dalitz Transition $h_c\to e^{+}{e}^{-}{\eta }_c$
• First measurement of ${\Sigma }^{+}n\to \Lambda p$ and ${\Sigma }^{+}n\to {\Sigma }^{0}p$ cross sections via ${\Sigma }^{+}$-nucleus scattering at an electron-positron collider
• The feasibility of single $\Lambda$ production via ${\ell }^{-}$ $+$ $p$ $\to$ $\Lambda$ $+$ ${\nu }_{\ell }$ at $e^{+}{e}^{-}$ colliders
• Observation of $\bar{\Lambda }p\to K^{+}{\pi }^{+}{\pi }^{-}{\pi }^0$ and $\bar{\Lambda }p\to K^{+}{\pi }^{+}{\pi }^{-}2{\pi }^0$